SABRATEK CORP
8-K, 1999-07-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549


                                    FORM 8-K


                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


Date of report (Date of earliest event reported) July 1, 1999
                                                --------------------------------

                              SABRATEK CORPORATION
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)


          Delaware                    1-11831                     36-3700639
- --------------------------------------------------------------------------------
(State or Other Jurisdiction        (Commission               (I.R.S. Employer
      of Incorporation)              File Number)            Identification No.)


8111 North St. Louis, Skokie, Illinois                            60076
- --------------------------------------------------------------------------------
(Address of Principal Executive Offices)                        (Zip Code)


                                 (847) 720-2400
- --------------------------------------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)


                                 Not Applicable
- --------------------------------------------------------------------------------
(Former Name or Former Address, if Changed Since Last Report)



<PAGE>   2


         ITEM 2:  ACQUISITION OR DISPOSITION OF ASSETS.

         (a) On July 1, 1999, Sabratek Corporation, a Delaware corporation,
consummated a transaction in which it acquired approximately 99% of the issued
and outstanding capital stock of Unitron Medical Communications, Inc., a Florida
corporation, which does business as MOON Communications in exchange for 542,926
shares of Sabratek common stock. Sabratek acquired the Unitron stock under the
terms of an Option Agreement, dated as of January 22, 1999, by and among
Sabratek, Unitron and those Unitron shareholders who executed the Option
Agreement.

         Under the terms of the Option Agreement and a separate Escrow
Agreement, 532,195 shares of Sabratek's common stock were delivered directly to
the former Unitron shareholders and 10,731 shares of Sabratek's common stock
were delivered in escrow to Michael T. Cronin of Johnson Blakely Pope Bokor
Ruppel & Burns, P.A., who is acting as escrow agent under the Escrow Agreement.
The purpose of the escrow is to secure payment of any amounts to which Sabratek
may be entitled in the event it is determined that Unitron breached any of its
representations and warranties contained in the Option Agreement. In connection
with the transaction, Sabratek also entered into a Registration Rights Agreement
in which Sabratek agreed to file a registration statement registering the resale
by the former Unitron shareholders of all 542,926 shares of Sabratek common
stock issued to them.

         Sabratek may attempt to acquire shares of Unitron's capital stock it
did not acquire through the exercise of its option on terms substantially
similar to those contained in the Option Agreement. Sabratek anticipates that it
will be required to issue less than 10,000 additional shares of its common stock
to acquire all of the Unitron capital stock it does not already own and intends
to register the resale of any additional shares of its common stock which it
issues in such acquisitions.

          Prior to Sabratek's acquisition of Unitron, the companies were
associated through several agreements. In July, 1997, Unitron granted Sabratek a
fifteen-year technology license for use of Unitron's continuous, real-time
patient monitoring and reporting software for which Sabratek paid Unitron $7
million. In January, 1998, Sabratek acquired rights to access Unitron's customer
database. In addition, Sabratek provided consulting services to Unitron under a
Marketing and Clinical Support Agreement, dated as of January 1, 1998. Further,
in October, 1998, Sabratek entered into a Standby Senior Credit Facility with
Unitron whereby Sabratek may lend up to $10 million to Unitron.

         (b) As part of its acquisition of Unitron, Sabratek acquired (i) office
space subject to existing leases, (ii) furniture, (iii) fixtures, (iv) equipment
and (v) rights to intellectual property (together, the "Property"). Sabratek
intends to use the Property for the same purposes and in the same manner as it
was used by Unitron prior to this acquisition.

         A copy of the Option Agreement is filed with this report as Exhibit
10.54 and the description set forth above is qualified in its entirety by
reference to the complete terms and conditions contained in the Option
Agreement.


                                     - 2 -
<PAGE>   3

         (c) EXHIBITS

         4.5    Registration Rights Agreement, dated as of January 22, 1999, by
                and among Sabratek Corporation and the holders of common stock,
                options and warrants issued by Unitron Medical Communications,
                Inc

         10.54  Option Agreement, dated as of January 22, 1999, by and among
                Sabratek Corporation, Unitron Medical Communications, Inc. and
                the holders of all of the common stock, options and warrants
                issued by Unitron Medical Communications, Inc. (Sabratek hereby
                agrees to furnish supplementally to the Securities and Exchange
                Commission upon request a copy of any omitted schedule or
                exhibit, all of which are listed in the table of contents to the
                Option Agreement.)


                                      -3-
<PAGE>   4



                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.



Date: July 16, 1999                         By:      \s\ Stephen L. Holden
     --------------                            ---------------------------------
                                                  Stephen L. Holden, President



                                     - 4 -

<PAGE>   1
                                                                         EX. 4.5


                          REGISTRATION RIGHTS AGREEMENT

         THIS AGREEMENT is made and entered into on January 22, 1999, by and
between Sabratek Corporation, a Delaware corporation (the "Company"), and the
holders the ("Unitron Shareholders")of common stock, options and warrants of
Unitron Medical Communications, Inc., a Florida corporation ("Unitron"), who are
signatories hereto.

         The Company, Unitron and certain equity holders of Unitron are parties
to that certain Stock Option Agreement of even date herewith (the "Option
Agreement") whereby (a) the Company has obtained the right to purchase all of
the equity interests in Unitron, (b) the Unitron equity holders obtained from
the Company the right to require the Company to purchase all of their equity
interests in Unitron and (c) the Company may, at its election, acquire all of
the assets and assume the liabilities of Unitron as provided in the Option
Agreement in lieu of the equity of Unitron, in each case subject to and in
accordance with the terms of the Option Agreement.

         The issuance of Sabratek common stock and the related preferred share
purchase rights ("Common Stock") to the Unitron Shareholders pursuant to the
Option Agreement will not be registered under the Securities Act of 1933, as
amended (the "Securities Act"), in reliance upon the exemption provided by
Section 4(2) thereof and Rule 506 of Regulation D promulgated under the
Securities Act. In order to induce the Unitron Shareholders to enter into the
Option Agreement, the Company has agreed to provide the registration rights set
forth in this Agreement. Unless otherwise provided in this Agreement,
capitalized terms used herein shall have the meanings set forth in the Option
Agreement, other than the capitalized terms defined in paragraph 9 hereof.

         The parties hereto agree as follows:

         1. Shelf Registration.

         (a) Upon the exercise of the Call Option or the Put Option, as the case
may be, pursuant to the Option Agreement, the Company will use its best efforts
to register under the Securities Act (prior to the date which is 20 days after
the consummation of the closing of the Call Option or the Put Option as the case
may be) the resale by the Unitron Shareholders of any or all Registrable
Securities in a delayed or continuous offering to the extent permitted by Rule
415 (or any successor rule thereto) promulgated under the Securities Act (the
"Shelf Registration"), subject to paragraph (f) below. Such a Registration
Statement shall be on Form S-3 (or any successor form to Form S-3) or another
appropriate form permitting registration of such Registrable Securities for
resale by the Unitron Shareholders in the manner or manners designated in
writing to the Company by them (including, without limitation, one or more
underwritten offerings). In the event the registration of a delayed or
continuous offering is not permitted under the Securities Act, the Company will
provide comparable alternative registration rights under the Securities Act to
the holders of Registrable Securities.



<PAGE>   2



         (b) The Company shall use its reasonable best efforts (i) to cause the
Shelf Registration to be declared effective as promptly as practical after its
filing and (ii) to keep the Shelf Registration continuously effective under the
Securities Act from the initial effectiveness thereof until the earliest to
occur of (A) the date when all Registrable Securities registered under the Shelf
Registration have been sold in the manner set forth and as contemplated in the
Shelf Registration or (B) the date when all remaining Registrable Securities are
freely transferable in the open market without limitations as to volume and
without being required to file any forms or reports with the Securities and
Exchange Commission ("SEC") under the Securities Act or the rules and
regulations thereunder by persons other than affiliates of the Company or (C)
the date which is two years (or such other period specified by Rule 144(k)
promulgated under the Securities Act or any successor rule thereto) after the
Closing Date (such period being referred to herein as the "Effectiveness
Period").

         (c) If the registration statement relating to the Shelf Registration
ceases to be effective for any reason at any time during the Effectiveness
Period, the Company shall use its reasonable best efforts to obtain the prompt
withdrawal of any order suspending the effectiveness thereof, and in any event
shall within 30 days of such cessation of effectiveness amend such registration
statement in a manner reasonably expected to obtain the withdrawal of the order
suspending the effectiveness thereof, or file an additional registration
statement covering all of the Registrable Securities for an offering to be made
by the holders on a delayed or continuous basis as permitted by the rules and
regulations under the Securities Act. In the event the registration of a delayed
or continuous offering is not permitted under the Securities Act, the Company
will provide alternative registration rights under the Securities Act to the
holders of Registrable Securities. If an additional registration statement is
filed, the Company shall use its reasonable best efforts to cause such
registration statement to be declared effective as soon as practicable after
such filing and to keep such registration statement continuously effective for
the remainder of the Effectiveness Period.

         (d) The Company shall pay for all Registration Expenses associated with
a Shelf Registration as set forth in paragraph 5 hereof.

         (e) The holders of a majority of the Registrable Securities initially
included in the Shelf Registration shall have the right to select the investment
banker(s) and manager(s), if any, to administer any underwritten offering
pursuant to the Shelf Registration, subject to the Company's approval of such
person(s), which approval shall not be unreasonably withheld.

         (f) The Company shall be entitled to postpone for a reasonable time,
not exceeding 20 days, the filing of the Shelf Registration or its efforts to
cause the Shelf Registration to become effective if at the time the right to
delay is exercised the Company shall determine in good faith that such offering
would interfere in any material respect with any material acquisition, financing
or other transaction which the Company is actively pursuing or require premature
disclosure (if the Company is so advised by its legal counsel) of any other
material



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<PAGE>   3

corporate development, which disclosure would adversely affect the interests of
the Company in any material respect; provided that this delay right may be
utilized by the Company only once.

         (g) The Company by notice to the holders of Registrable Securities may
postpone all sales under such effective Shelf Registration for a reasonable
time, not exceeding 45 days (provided that (x) the Company may not implement
more than two such postponements in any 12 month period and (y) all
postponements under this paragraph in any 12-month period shall not exceed 60
days), if the Company shall determine in good faith that permitting such sales
would interfere in any material respect with any material acquisition, financing
other transaction which the Company is actively pursuing or require premature
disclosure (if the Company is so advised by its legal counsel) of any other
material corporate development, which disclosure would adversely affect the
interests of the Company in any material respect.

         2. Piggyback Registration.

         (a) In the event that the Company intends to register at any time an
underwritten offering of Common Stock by the Company and/or stockholders of the
Company, the Company shall offer the Unitron Shareholders the right to include
any or all of their Registrable Securities in such registered offering (a
"Piggyback Notice"). The Company shall include in such registration (a
"Piggyback Registration") all Registrable Securities with respect to which the
Company has received written requests for inclusion therein within 10 days after
delivery of the Piggyback Notice. In the event of a Piggyback Registration, the
Company shall process to effectiveness such registration as promptly as
practicable, subject to the provisions of paragraph 2(g).

         (b) In any underwritten Piggyback Registration, each holder of
Registrable Securities who has elected to participate pursuant to paragraph 2(a)
must agree to sell such holder's Registrable Securities on the same basis
provided in the underwriting arrangements approved by the Company and to timely
complete and execute all questionnaires, powers of attorney, indemnities,
holdback agreements, underwriting agreements and other documents reasonably
required under the terms of such underwriting arrangements or by the SEC.

         (c) If the managing underwriter(s) for a Piggyback Registration advise
the Company in writing that in their opinion the number of Registrable
Securities and other securities, if any, requested to be included in such
offering exceeds the number of Registrable Securities and other securities, if
any, which can be sold in an orderly manner in such offering without adversely
affecting the marketability of the offering, the Company shall include in such
registration (i) first, the securities the Company proposes to sell, and (ii)
second, the Registrable Securities and other securities, if any, requested to be
included in such offering, pro rata among the holders of such Registrable
Securities and other securities, if any, on the basis of the number of shares
requested to be included by each such holder.



                                       3
<PAGE>   4

         (d) The Company shall have the right to select the investment banker(s)
and manager(s) to administer any Piggyback Registration.

         (e) The Company shall pay for all Registration Expenses associated with
a Piggyback Registration as set forth in paragraph 5 hereof.

         (f) A holder who has given notice to the Company under paragraph 2(a)
requesting inclusion of any Registrable Securities shall have the right to
withdraw its Registrable Securities from the Piggyback Registration, but only
during the time period and on terms agreed upon among the underwriters for such
underwritten offering and the other holders who wish to continue to register
securities under such Piggyback Registration.

         (g) Notwithstanding the foregoing, the Company shall, on written notice
to the holders who have given notice to the Company under paragraph 2(a), have
the right to withdraw any registration statement filed pursuant to this
paragraph 2 for a Piggyback Registration at any time prior to the effective date
thereof.

         3. Holdback Agreements.

         (a) The Company shall have the right to require that each holder of
Registrable Securities who holds at the time of the request one-half of 1
percent or more of the capital stock of the Company shall not effect any public
sale or distribution (including sales pursuant to the Shelf Registration or
pursuant to Rule 144) of common stock of the Company during the ten business
days prior to, and the 90-day period beginning on, the effective date of the
registration under the Securities Act of any underwritten offering of Common
Stock for cash by the Company (or such an offering by the Company and
stockholders of the Company), if the managing underwriter(s) for the public
offering so request. In order to exercise its rights under this paragraph 3(a),
the Company shall provide such holders of Registrable Securities (i) the right
to participate in such underwritten offering as provided in paragraph 2 and (ii)
written notice of the estimated effective date of any such registration at least
ten business days prior to such effectiveness. The restrictions of this
paragraph 3(a) shall apply whether or not such holder of Registrable Securities
elects to participate on a Piggyback Registration or is able to include in such
Piggyback Registration all Registrable Securities desired to be so included. The
Company shall be entitled to exercise its rights under this paragraph 3(a) not
more than twice during any calendar year.

         (b) The Company shall not effect any public sale or distribution of its
common stock, or any securities convertible into or exchangeable or exercisable
for such securities, during the ten business days prior to and during the 90-day
period beginning on the effective date of any underwritten Piggyback
Registration (except as part of such underwritten registration or an Exempt
Registration), unless the managing underwriter(s) for the Piggyback Registration
otherwise agree.



                                       4
<PAGE>   5

         (c) Each holder of Registrable Securities shall not effect any public
sale or distribution (including sales pursuant to the Shelf Registration or
pursuant to Rule 144) of common stock of the Company until such time as the
Company has prepared and filed ifnecessary and delivered to such holder a
supplement or amendment to the Shelf Registration or the related prospectus as
contemplated by Section 4(e).

         4. Registration Procedures. Whenever any Registrable Securities are
required to be registered pursuant to this Agreement, the Company shall use its
reasonable best efforts to effect the registration and the sale of such
Registrable Securities in accordance with the intended method of disposition
thereof, and pursuant thereto the Company shall as expeditiously as possible:

         (a) prepare and file with the SEC a registration statement with respect
to such Registrable Securities and use its reasonable best efforts to cause such
registration statement to become effective as promptly as practicable after such
filing (provided that before filing a registration statement or prospectus or
any amendments or supplements thereto, the Company shall furnish to the counsel
selected by the holders of a majority of the Registrable Securities covered by
such registration statement copies of all such documents proposed to be filed);

         (b) notify each holder of Registrable Securities of the effectiveness
of each registration statement filed hereunder and prepare and file with the SEC
such amendments and supplements to such registration statement and the
prospectus used in connection therewith as may be necessary to keep such
registration statement effective for the period of time set forth in paragraph
1, as applicable, and to comply with the provisions of the Securities Act with
respect to the disposition of all securities covered by such registration
statement during such period in accordance with the intended methods of
disposition by the sellers thereof set forth in such registration statement;

         (c) furnish to each seller of Registrable Securities such number of
copies of such registration statement, each amendment and supplement thereto,
the prospectus included in such registration statement (including each
preliminary prospectus) and such other documents as such seller may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by such seller;

         (d) use its reasonable best efforts to register or qualify such
Registrable Securities under the securities or blue sky laws of such
jurisdictions as any seller reasonably requests and do any and all other acts
and things which may be reasonably necessary or advisable to enable such seller
to consummate the disposition in such jurisdictions of the Registrable
Securities owned by such seller (provided that the Company shall not be required
to (i) qualify generally to do business in any jurisdiction where it would not
otherwise be required to qualify but for this subparagraph, (ii) subject itself
to taxation in any such jurisdiction or (iii) consent to general service of
process in any such jurisdiction);



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<PAGE>   6

         (e) promptly notify each seller of such Registrable Securities, at any
time when a prospectus relating thereto is required to be delivered under the
Securities Act, of the existence of facts or the happening of any event (without
necessarily identifying such facts or event to such sellers) as a result of
which the prospectus included in such registration statement contains an untrue
statement of a material fact or omits any fact necessary to make the statements
therein not misleading, and the Company shall prepare a supplement or amendment
to such prospectus so that, as thereafter delivered to the purchasers of such
Registrable Securities, such prospectus shall not contain an untrue statement of
a material fact or omit to state any fact necessary to make the statements
therein not misleading;

         (f) cause all such Registrable Securities to be listed or quoted for
trading on each securities exchange on which similar securities issued by the
Company are then listed;

         (g) provide a transfer agent and registrar for all such Registrable
Securities not later than the effective date of such registration statement;

         (h) enter into such customary agreements (including underwriting
agreements in customary form) and take all such other actions as the holders of
a majority of the Registrable Securities being sold or the underwriters
reasonably request in order to expedite or facilitate the disposition of such
Registrable Securities in any underwritten offering of Registrable Securities;

         (i) make available for reasonable inspection by any seller of
Registrable Securities, any underwriter participating in any disposition
pursuant to such registration statement and any attorney, accountant or other
agent retained by any such seller or underwriter, such financial and other
records, corporate documents and properties of the Company as are customarily
made available to such persons on a confidential basis by the issuer in
connection with a registered public offering of securities similar to the
Registrable Securities, and cause the Company's officers, directors, employees
and independent accountants to supply all information reasonably requested by
any such seller, underwriter, attorney, accountant or agent in connection with
such registration statement; and

         (j) otherwise use its best efforts to comply with all applicable rules
and regulations of the SEC, and make available to its security holders, as soon
as reasonably practicable, an earnings statement covering the period of at least
twelve months beginning with the first day of the Company's first full calendar
quarter after the effective date of the registration statement, which earnings
statement shall satisfy the provisions of Section 11(a) of the Securities Act
and Rule 158 thereunder.

         5. Registration Expenses.

         (a) All expenses incident to the Company's performance of or compliance
with this Agreement, including without limitation all registration and filing
fees, fees and expenses of compliance with securities or blue sky laws, printing
expenses, messenger and delivery expenses,



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fees and disbursements of custodians, and fees and disbursements of counsel for
the Company and all independent certified public accountants, underwriters
(excluding discounts and commissions) and other persons retained by the Company
(all such expenses being herein called "Registration Expenses"), shall be borne
as provided in this Agreement, except that the Company shall, in any event, pay
its internal expenses (including, without limitation, all salaries and expenses
of its officers and employees performing legal or accounting duties), the
expense of any annual audit or quarterly review, the expense of any liability
insurance and the expenses and fees for listing the securities to be registered
on each securities exchange on which similar securities issued by the Company
are then listed or quoted for trading.

         (b) In connection with the Shelf Registration or any other registration
statement in lieu thereof and any amendment to either of such as contemplated by
this Agreement, the Company shall reimburse the holders of Registrable
Securities included in such registration for the reasonable fees (not exceeding
$25,000 for such registration) and disbursements of Shumaker, Loop & Kendrick,
LLP or one other counsel chosen by the holders of a majority of the Registrable
Securities included in such registration.

         6. Indemnification.

         (a) The Company agrees to indemnify each holder of Registrable
Securities, its officers and directors and each Person who controls such holder
(within the meaning of the Securities Act) against all losses, claims, damages,
liabilities and expenses caused by (i) any untrue or alleged untrue statement of
material fact contained in any registration statement, prospectus or preliminary
prospectus or any amendment thereof or supplement thereto; (ii) any omission or
alleged omission of a material fact required to be stated therein or necessary
to make the statements therein not misleading, except insofar as the same are
caused by or contained in any information furnished in writing to the Company by
such holder expressly for use therein or by such holder's failure to deliver a
copy of the registration statement or prospectus or any amendments or
supplements thereto after the Company has furnished such holder with a
sufficient number of copies of the same; or (iii) any violation or alleged
violation by the Company of the Securities Act, the Securities Exchange Act of
1934, as amended (the "Exchange Act"), or any other federal or state securities
law, rule or regulation in connection with the registration of the resale of the
Registrable Securities as contemplated by this Agreement, except insofar as the
same is caused by or results from any information furnished in writing to the
Company by any such holder expressly for use therein or from a failure by any
such holder to deliver a copy of the registration statement or prospectus or any
amendments or supplements thereto after the Company has furnished any such
holder with a sufficient number of copies of the same. In connection with an
underwritten offering, the Company shall indemnify such underwriters, their
officers and directors and each Person who controls such underwriters (within
the meaning of the Securities Act) to the same extent as provided above with
respect to the indemnification of the holders of Registrable Securities.



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<PAGE>   8

         (b) In connection with any registration statement in which a holder of
Registrable Securities is participating, each such holder shall furnish to the
Company in writing such information and affidavits as the Company reasonably
requests for use in connection with any such registration statement or
prospectus and shall indemnify the Company, its directors and officers and each
Person who controls the Company (within the meaning of the Securities Act)
against any losses, claims, damages, liabilities and expenses resulting from any
untrue or alleged untrue statement of fact contained in the registration
statement, prospectus or preliminary prospectus or any amendment thereof or
supplement thereto or any omission or alleged omission of a fact required to be
stated therein or necessary to make the statements therein not misleading, but
only to the extent the same are caused by or contained in any information
furnished in writing to the Company by such holder expressly for use therein or
by such holder's failure to deliver a copy of the registration statement or
prospectus or any amendments or supplements thereto after the Company has
furnished such holder with a sufficient number of copies of the same.

         (c) Any Person entitled to indemnification hereunder shall (i) give
prompt written notice to the indemnifying party of any claim with respect to
which it seeks indemnification and (ii) unless in such indemnified party's
reasonable judgment a conflict of interest between such indemnified and
indemnifying parties may exist with respect to such claim, permit such
indemnifying party to assume the defense of such claim with counsel reasonably
satisfactory to the indemnified party. The failure to so notify the indemnifying
party shall not relieve the indemnifying party from any liability hereunder with
respect to the action, except to the extent that such failure prevents the
indemnifying party from contesting such action or otherwise prejudices the
indemnifying party; provided that any such failure shall not relieve the
indemnifying party from any other liability which it may have to any other
person. If the indemnifying party gives notice to such indemnified party of its
election to assume and control the defense of such claim, the indemnifying party
will not be liable to such indemnified party for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense or
investigation of the action unless the indemnified party shall have given the
indemnifying party notice of a conflict of interest between the indemnified
party and indemnifying party with respect to such claim. The failure of an
indemnifying party to give notice to the indemnified party of its election to
assume and control the defense of any action for which notice has been given to
the indemnifying party in accordance with this paragraph within 30 days after
receipt of such notice shall constitute an election by the indemnifying party
not to assume and control the defense of such action. An indemnifying party who
is not entitled to, or elects not to, assume the defense of a claim shall not be
obligated to pay the fees and expenses of more than one counsel for all parties
indemnified by such indemnifying party with respect to such claim, unless in the
reasonable judgment of any indemnified party a conflict of interest may exist
between such indemnified party and any other of such indemnified parties with
respect to such claim, in which event the indemnifying party shall be obligated
to pay the fees and expenses of one separate counsel for such indemnified
parties. No indemnified party shall consent to the entry of any judgment or
enter into any settlement with respect to a claim for which indemnification may
be sought without the prior written consent of the indemnifying party.



                                       8
<PAGE>   9

         (d) The indemnification provided for under this Agreement shall remain
in full force and effect regardless of any investigation made by or on behalf of
the indemnified party or any officer, director or controlling Person of such
indemnified party and shall survive the transfer of securities. The Company also
agrees to make such provisions, as are reasonably requested by any indemnified
party, for contribution to such party in the event the Company's indemnification
is unavailable for any reason.

         7. Participation in Underwritten Registrations, Sale and Other
Information. No Unitron Shareholder may participate in any registration
hereunder which is underwritten unless such person (i) agrees to sell such
person's securities on the basis provided in any underwriting arrangements
approved by the person or persons entitled hereunder to approve such
arrangements and (ii) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents reasonably
required under the terms of such underwriting arrangements. Upon the request of
the Company, each Unitron Shareholder shall provide to the Company such
information regarding its ownership of Common Stock, relationships with the
Company and intended method(s) of distribution, as are reasonably requested by
the Company in connection with the preparation of any Registration Agreement
pursuant to this Agreement. Promptly following any sale or other transfer of any
Registrable Securities covered by the Shelf Registration, the person selling or
transferring such securities shall promptly notify the Company in writing
thereof, which notice shall specify the amount of securities involved and the
market, if any, on which such sale or transfer occurred.

         8. Rule 144 Information. With a view to making available the benefits
of Rule 144 under the Securities Act or a successor provision to the holders of
Registrable Securities, the Company agrees to use its best efforts to file with
the Commission for a period of two years subsequent to the date of this
Agreement (or such lesser period of time specified by Rule 145(k) under the
Securities Act) in a timely manner (taking into account any extensions of filing
deadlines) all reports required to be filed by the Company under the Exchange
Act.

         9. Definitions.

         (a) "Exempt Registration" means any registration of securities by the
Company under the Securities Act pursuant to a (i) Registration Statement on a
Form S-8 (or any successor thereto), (ii) Registration Statement on Form S-4
covering solely securities issued in connection with a business combination or
other transaction specified in Rule 145(a) under the Securities Act, or (iii)
Registration Statement on Form S-3 covering solely securities issued under a
dividend reinvestment program.

         (b) "Registrable Securities" means (i) any Sabratek common stock issued
upon exercise of the Call Option or the Put Option, as the case may be, pursuant
to the Option Agreement, (ii) any Sabratek common stock issued in connection
with a merger of consolidation of Unitron and Sabratek (or a wholly owned
subsidiary of Sabratek) in which the outstanding common stock of Unitron is
converted into common stock of Sabratek, or (iii) any Sabratek



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<PAGE>   10

common stock issued or issuable with respect to the outstanding Sabratek common
stock by way of a stock dividend or stock split or in connection with a
combination of shares, recapitalization, merger, consolidation or other
reorganization. As to any particular Registrable Securities, such securities
shall cease to be Registrable Securities when (A) they have been distributed to
the public pursuant to a offering registered under the Securities Act; (B) sold
to the public through a broker, dealer or market maker in compliance with Rule
144 under the Securities Act (or any similar rule then in force); or (C)
repurchased by the Company or any subsidiary of the Company.

         10. Miscellaneous.

         (a) No Inconsistent Agreements. The Company shall not hereafter enter
into any agreement with respect to its securities which is inconsistent with or
violates the rights granted to the holders of Registrable Securities in this
Agreement.

         (b) Adjustments Affecting Registrable Securities. The Company shall not
take any action, or permit any change to occur, with respect to its securities
which would materially and adversely affect the ability of the holders of
Registrable Securities to include such Registrable Securities in a registration
undertaken pursuant to this Agreement or which would materially and adversely
affect the marketability of such Registrable Securities in any such registration
(including, without limitation, effecting a stock split or a combination of
shares).

         (c) Remedies. Any Person having rights under any provision of this
Agreement shall be entitled to enforce such rights specifically to recover
damages caused by reason of any breach of any provision of this Agreement and to
exercise all other rights granted by law. The parties hereto agree and
acknowledge that money damages may not be an adequate remedy for any breach of
the provisions of this Agreement and that any party may in its sole discretion
apply to any court of law or equity of competent jurisdiction (without posting
any bond or other security) for specific performance and for other injunctive
relief in order to enforce or prevent violation of the provisions of this
Agreement.

         (d) Amendments and Waivers. Except as otherwise provided herein, the
provisions of this Agreement may be amended or waived only upon the prior
written consent of the Company and holders of more than 50% of the Registrable
Securities.

         (e) Successors and Assigns. All covenants and agreements in this
Agreement by or on behalf of any of the parties hereto shall bind and inure to
the benefit of the respective successors and assigns of the parties hereto
whether so expressed or not. In addition, whether or not any express assignment
has been made, the provisions of this Agreement which are for the benefit of
purchasers or holders of Registrable Securities are also for the benefit of, and
enforceable by, any subsequent holder of Registrable Securities, provided that
prior to any transfer of Registrable Securities the holder thereof shall obtain
the written acknowledgment and agreement of the transferee to be bound by the
terms of this Agreement.



                                       10
<PAGE>   11

         (f) Severability. If any provision of this Agreement shall be held
invalid or unenforceable by any court of competent jurisdiction or as a result
of legislative or administrative action, such holding or action shall be
strictly construed and shall not affect the validity of or affect any other
provision of this Agreement.

         (g) Counterparts. This Agreement may be executed in counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same instrument. A facsimile copy of this Agreement and any
signatures hereon shall be considered as originals for all purposes.

         (h) Notices. All notices and other communications must be in writing
and shall be deemed given on the date delivered if delivered in person or by
facsimile or by overnight courier, or on the third business day after mailing if
mailed by registered or certified mail, postage pre-paid, return receipt
requested, to the persons at the addresses set forth below (or such other
address for a party as shall be specified by like notice):

       If to the Company:                  Sabratek Corporation
                                           8111 N. St. Louis Avenue
                                           Skokie, Illinois 60076
                                           Attention: Chief Financial Officer

                with a copy to:            Kirkland & Ellis
                                           200 East Randolph Drive
                                           Chicago, Illinois 60601
                                           Attention: Carter W. Emerson

       If to the Unitron Shareholders:     To the address set forth on the
                                           signature page affixed hereto for
                                           each such Unitron Shareholder

                with a copy to:            Unitron Medical Communications, Inc.
                                           17757 U.S. Highway 19 North
                                           Suite 600
                                           Clearwater, FL 33764
                                           Attention: Chief Executive Officer

                and to:                    Johnson Blakely Pope Bokor
                                           Ruppel & Burns, P.A.
                                           911 Chestnut Street
                                           Clearwater, Florida 34617
                                           Attention: Michael T. Cronin, Esq.

                and to:                    Shumaker, Loop & Kendrick, LLP
                                           Barnett Plaza, Suite 2800
                                           101 East Kennedy Boulevard
                                           Post Office Box 172609
                                           Tampa, Florida  33672-0609
                                           Attention: Darrell Smith


                                       11

<PAGE>   12




         (i) Entire Agreement. This Agreement constitutes the entire agreement
between the parties and supersedes any prior understandings, agreements or
representations by or between the parties, written or oral, to the extent they
related in any way to the subject matter.

         (j) Governing Law. This Agreement shall be governed in all respects,
including validity, interpretation and effect, by the internal laws of the State
of Delaware without regard to principles of conflicts of law.

         (k) Interpretation. The captions in this Agreement are for convenience
of reference only and shall not limit or otherwise affect any of the terms or
provisions hereof. Terms such as "herein", "hereof", and "hereinafter" refer to
this Agreement as a whole and not to the particular sentence or paragraph where
they appear, unless the context otherwise requires. Whenever the context
requires, references in this Agreement to the singular number shall include the
plural, the plural number shall include the singular and words denoting gender
shall include the masculine, feminine and neuter.


                                    * * * * *



                                       12

<PAGE>   13


         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first written above.

                                           SABRATEK CORPORATION



                                           By  /s/ STEPHEN L. HOLDEN
                                              ----------------------------------
                                           Its: President

                                           UNITRON SHAREHOLDER:


                                           Printed Name:
                                                        ------------------------
                                           Signature:
                                                     ---------------------------
                                           Title (if applicable):

                                           Address:
                                                    ----------------------------

                                                    ----------------------------

                                                    ----------------------------



                                       13

<PAGE>   1
                                                                        EX 10.54


================================================================================

                                OPTION AGREEMENT

                                  BY AND AMONG

                              SABRATEK CORPORATION,

                      UNITRON MEDICAL COMMUNICATIONS, INC.

                                       AND

                     CERTAIN OF THE SHAREHOLDERS OF UNITRON

================================================================================






                                JANUARY 22, 1999



<PAGE>   2



                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                                Page
                                                                                                                ----
<S>                                                                                                             <C>
ARTICLE 1.

         CALL OPTION AND PUT OPTION...............................................................................2
                  1.1      Grant of Call Option...................................................................2
                  1.2      Exercise of Call Option................................................................2
                  1.3      Grant of Put Option....................................................................3
                  1.4      Term of Put Option.....................................................................3
                  1.5      Exercise of Put Option.................................................................3
                  1.6      Restrictions on Transfer of Unitron Shares and Unitron Options.........................4
                  1.7      Documents Evidencing Unitron Shares....................................................5
                  1.8      Unitron Options........................................................................5

ARTICLE 2.

         DETERMINATION AND PAYMENT OF PURCHASE PRICE..............................................................7
                  2.1      Purchase Price for Unitron Shares and Unitron Options..................................7
                  2.2      Payment of Purchase Price..............................................................8

ARTICLE 3.

         CLOSING OF PURCHASE AND SALE OF SHARES..................................................................10
                  3.1      Closing...............................................................................10
                  3.2      Delivery of Certificates and Payment for Shares.......................................10
                  3.3      Election to Acquire Unitron Assets....................................................11
                  3.4      Sabratek Closing Representation.......................................................15
                  3.5      Final Legal Statements................................................................15
                  3.6      Notices and Consents..................................................................15
                  3.7      Time..................................................................................15

ARTICLE 4.

         ADDITIONAL AGREEMENTS...................................................................................16
                  4.1      Conduct of Unitron Business...........................................................16
                  4.2      Financial Information; Access.........................................................18
                  4.3      Unitron Shareholder Solicitation......................................................19
                  4.4      Engagement of Unitron CEO.............................................................19
                  4.5      Audit of Unitron Financial Statements.................................................19
                  4.6      Sabratek Reports......................................................................20

</TABLE>

                                       -i-

<PAGE>   3

<TABLE>
<S>                                                                                                             <C>
                  4.7      Covenants by Unitron Affiliates With Respect to Sabratek Stock........................20
                  4.8      HSR Filing............................................................................20
                  4.9      Additional Unitron Financing..........................................................21
                  4.10     Public and Other Statements...........................................................21
                  4.11     Unitron Legal Opinion.................................................................21
                  4.12     Sabratek Legal Opinion................................................................21
                  4.13     Unitron Special Meeting...............................................................21
                  4.14     Waiver of Known Breaches..............................................................22
                  4.15     Unitron Source Code...................................................................22
                  4.16     Transactions in Sabratek Stock by Unitron Shareholders................................22
                  4.17     Release of Sponaugle..................................................................22
                  4.18     Buyout of Non-Accredited Investors....................................................22
                  4.19     ......................................................................................22
                  4.20     Sexual Harassment Policy..............................................................23

ARTICLE 5.

         CONDITIONS TO CLOSING...................................................................................23
                  5.1      Conditions to Obligation of Sabratek..................................................23
                  5.2      Conditions to Obligations of Unitron and the Unitron Shareholders.....................25

ARTICLE 6.

         REPRESENTATIONS AND WARRANTIES..........................................................................25
                  6.1      Representations and Warranties of Unitron Shareholders................................25
                  6.2      Representations and Warranties of Unitron.............................................28
                  6.3      Representations and Warranties of Sabratek............................................39

ARTICLE 7.

         PURCHASE PRICE OFFSET; INDEMNIFICATION..................................................................43
                  7.1      Purchase Price Offset:  Determination of Damages Offset...............................43
                  7.2      Indemnification.......................................................................45
                  7.3      Third Party Claims....................................................................47
                  7.4      Exclusivity...........................................................................48

ARTICLE 8.

         TERMINATION.............................................................................................48
                  8.1      Right to Terminate....................................................................48

</TABLE>

                                      -ii-

<PAGE>   4



<TABLE>
<S>                                                                                                             <C>
ARTICLE 9.

         GENERAL PROVISIONS......................................................................................50
                  9.1      Dispute Resolution....................................................................50
                  9.2      Remedies Cumulative...................................................................51
                  9.3      Assignment; Binding Effect............................................................51
                  9.4      Notices...............................................................................51
                  9.5      Entire Agreement; Amendment; Treatment of Other Agreements............................53
                  9.6      Severability..........................................................................54
                  9.7      Governing Law.........................................................................54
                  9.8      Interpretation........................................................................54
                  9.9      Disclosure Schedules..................................................................54
                  9.10     Counterparts..........................................................................54
                  9.11     Waiver................................................................................55
                  9.12     Expenses..............................................................................55
                  9.13     Exhibits and Schedules................................................................55

EXHIBITS:

         Exhibit A         Certificates Escrow Agreement
         Exhibit B         Frasca Closing Escrow Terms
         Exhibit C         Frasca Closing Escrow Agreement
         Exhibit D         Form of Regulation D Questionnaire
         Exhibit E         Form of Release Agreement
         Exhibit F         Substance of Opinion of Special Counsel to Unitron
         Exhibit G         Substance of Opinion of Special Counsel to Sabratek
</TABLE>


                                      -iii-

<PAGE>   5




                                OPTION AGREEMENT

         THIS OPTION AGREEMENT (this "Agreement") is made and entered into on
January 22, 1999 (the "Effective Date") by and among SABRATEK CORPORATION, a
Delaware corporation ("Sabratek"), UNITRON MEDICAL COMMUNICATIONS, INC., a
Florida corporation ("Unitron"), and the holders of Unitron common stock,
options, warrants and/or other rights to purchase Unitron common stock parties
hereto (collectively, the "Unitron Shareholders").

                                    RECITALS:

         A. Unitron, certain shareholders of Unitron and Sabratek are parties to
that certain Stock Option Agreement dated July 1, 1997 (the "1997 Option
Agreement") and that certain Registration Rights Agreement dated July 1, 1997
(the "1997 Registration Agreement" and together with the 1997 Option Agreement,
the "1997 Agreements"). Sabratek and Unitron desire to terminate the 1997
Agreements and to replace them with this Agreement and the agreements
contemplated hereby, except that the termination of the 1997 Agreements is
contingent upon among other things Unitron Shareholders holding 92.5% or more of
the fully diluted equity of Unitron becoming a party to this Agreement in
accordance with the terms of this Agreement (the "Necessary Shareholder
Parties"). All other agreements between Sabratek and Unitron and the rights of
the parties thereunder will remain unaffected by the replacement of the 1997
Agreements with this Agreement and the agreements contemplated hereby, and such
other agreements remain in full force and effect and not be terminable as a
result of this Agreement and the agreements contemplated hereby.

         B. Sabratek desires to obtain the right to purchase all of the equity
interests in Unitron as contemplated by this Agreement. The Unitron Shareholders
are willing to grant to Sabratek the right to purchase all of the equity
interests in Unitron that may be held by them from time to time at or after the
Effective Date, subject to and in accordance with the terms and conditions set
forth in this Agreement. The Unitron Shareholders desire to obtain from Sabratek
the right to require Sabratek to purchase all of their equity interests in
Unitron, and Sabratek is willing to grant such right to the Unitron
Shareholders, subject to and in accordance with the terms and conditions set
forth in this Agreement.

         C. At the election of Sabratek, Sabratek may acquire all of the assets
of Unitron (in lieu of the equity of Unitron) and in connection therewith assume
or pay for certain Unitron liabilities, subject to and in accordance with the
terms of this Agreement.

         D. Concurrently with the execution and delivery of this Agreement, the
following agreements and instruments are being entered into and delivered:


                                        1

<PAGE>   6




         -     Registration Rights Agreement by and among Sabratek and certain
               of the equity holders of Unitron (the "Registration Agreement").

         -     Term sheets involving Sabratek and Unitron and certain other
               parties regarding the commercialization of the Unitron technology
               in the United Kingdom (the "UK Agreements").

         -     Resignations from Unitron of Ralph V. Frasca ("Frasca").

         -     Shareholders Agreement by and among Sabratek, Frasca, Marvin L.
               Sponaugle ("Sponaugle"), Roger L. Overby ("Overby") and Edward
               Presutti.

         -     Separation Agreement by and between Sabratek and Frasca (the
               "Frasca Separation Agreement").

         -     Consulting and Non-Competition Agreement by and between Sabratek
               and Overby (the "Overby Consulting Agreement").

         E. Prior to the execution and delivery of this Agreement by Unitron and
Sabratek, the sole director of the Board of Directors of Unitron (the "Unitron
Board") duly elected Chuck Hall, Jay Hill and Paul Jurewicz to the Unitron
Board. Immediately following such elections, Frasca duly resigned from the
Unitron Board as contemplated by the resignations described above.

         NOW, THEREFORE, in consideration of the foregoing recitals and the
mutual covenants contained herein, the parties agree as follows:

                                    ARTICLE 1

                           CALL OPTION AND PUT OPTION

                   1.1       Grant of Call Option. On the terms and subject to
                        the conditions set forth in this Agreement, each of the
                        Unitron Shareholders hereby grants to Sabratek an option
                        to purchase all, but not less than all, of the shares of
                        capital stock (Class A and/or Class B Common Shares) of
                        Unitron (the "Unitron Shares") owned by such Unitron
                        Shareholder from time to time at or after the Effective
                        Date and to purchase (or to cause Unitron to repurchase
                        or terminate) as provided in this Agreement all, but not
                        less than all, of the issued and outstanding options,
                        warrants and other rights to purchase Unitron Shares
                        (the "Unitron Options") owned by such Unitron
                        Shareholder from time to time at or after the Effective



                                        2
<PAGE>   7

                        Date (the "Call Option") for the consideration
                        determined in accordance with the terms of this
                        Agreement.

                   1.2       Exercise of Call Option. Unless this Agreement is
                        terminated pursuant to Section 8.1, the Call Option may
                        be exercised by Sabratek in its sole discretion at any
                        time after the Effective Date and at or before 5:00 p.m.
                        (Central Time) on July 15, 1999 (the "Call Option
                        Period") by delivery of written notice of exercise to
                        Unitron and the Unitron Representative Shareholders (the
                        "Call Exercise Notice") on any date during the Call
                        Option Period (the "Call Exercise Date"). The form of
                        the Call Exercise Notice shall be as set forth on
                        Schedule 1.2. The Call Exercise Notice shall be
                        irrevocable. Consummation of the purchase and sale of
                        the Unitron Shares and the Unitron Options (the
                        "Closing") shall occur (subject to the following
                        sentence and the terms and conditions of this Agreement)
                        on the date specified by Sabratek in the Call Exercise
                        Notice; provided that the specified Closing Date shall
                        be a date occurring at least 3 business days after the
                        Call Exercise Date but not more than 8 business days
                        after the Call Exercise Date. The "Closing Date" shall
                        be such date as is specified by Sabratek in the Call
                        Exercise Notice, or if later the third business day
                        following the satisfaction or waiver of all conditions
                        to the obligations of the parties to this Agreement to
                        consummate the transactions contemplated hereby (other
                        than conditions with respect to actions the respective
                        parties will take at the Closing itself) or if later the
                        third business day following the completion of any
                        arbitration conducted with respect to Section 7.1 or
                        with respect to the determination of the amount of the
                        Differential Tax Liability or the Unitron Cash Asset
                        Sale Tax Liability (as each is hereinafter defined) as
                        contemplated by Section 3.3. Upon the Closing, the
                        Unitron Shareholders shall have no further rights with
                        respect to their previously owned Unitron Shares and
                        Unitron Options.

                   1.3      Grant of Put Option. On the terms and subject to
                        the conditions set forth in this Agreement, Sabratek
                        hereby grants to the Unitron Shareholders the right to
                        require Sabratek to purchase all, but not less than all,
                        of the Unitron Shares and Unitron Options owned by the
                        Unitron Shareholders from time to time at or after the
                        Effective Date (the "Put Option") for the consideration
                        determined in accordance with the terms of this
                        Agreement.



                                       3
<PAGE>   8

                   1.4       Term of Put Option. The Put Option granted
                        hereunder shall become exercisable on and as of the
                        first business day immediately following the expiration
                        of the Call Option Period and shall continue in effect
                        for a period of 10 business days (the "Put Option
                        Period").

                   1.5       Exercise of Put Option. The Put Option may be
                        exercised during the Put Option Period by the Unitron
                        Representative Shareholders (as hereinafter defined)
                        delivering to Sabratek written notice (the "Put Exercise
                        Notice") of exercise at any time (the "Put Option
                        Exercise Date") on or before 5:00 p.m. (Central Time) on
                        the last day of the Put Option Period. The form of the
                        Put Exercise Notice shall be as set forth on Schedule
                        1.2. Such election of the Unitron Representative
                        Shareholders shall be binding on all Unitron
                        Shareholders, and each of the Unitron Shareholders
                        hereby agrees to any such exercise of the Put Option.
                        This provision constitutes a power of attorney granted
                        to the Unitron Representative Shareholders, and this
                        power or attorney shall be irrevocable and coupled with
                        an interest from the date of execution of this Agreement
                        by such Unitron Shareholder through the last day of the
                        Put Option Period. All of the Unitron Shareholders will
                        sell all of their Unitron Shares and Unitron Options to
                        Sabratek in the event the Put Option is exercised in
                        accordance with this Section. The power of attorney
                        granted to the Unitron Representative Shareholders
                        herein includes all powers necessary to exercise the Put
                        Option and effectuate a sale of Unitron Shares and
                        Unitron Options on behalf of any Unitron Shareholder in
                        accordance with the terms of this Section. The Put
                        Exercise Notice shall be irrevocable. Consummation of
                        the purchase and sale of the Unitron Shares (also the
                        "Closing") shall occur (subject to the following
                        sentence and the terms and conditions of this Agreement)
                        on the date specified by Sabratek; provided that the
                        specified Closing Date shall be a date occurring at
                        least 3 business days after the end of the Put Option
                        Period but not more than 8 business days after the end
                        of the Put Option Period. The "Closing Date" shall be
                        such date as is specified by Sabratek, or if later the
                        third business day following the satisfaction or waiver
                        of all conditions to the obligations of the parties to
                        this Agreement to consummate the transactions
                        contemplated hereby (other than conditions with respect
                        to actions the respective parties will take at the
                        Closing itself) or if later the third business day
                        following the completion of any arbitration conducted
                        with respect to Section 7.1 or with respect to the
                        determination of the amount of the Differential Tax
                        Liability or the Unitron Cash Asset Sale Tax Liability
                        (as each is hereinafter defined) as contemplated by
                        Section 3.3. Immediately following the Closing, the


                                       4
<PAGE>   9

                        Unitron Shareholders shall have no further rights with
                        respect to their previously owned Unitron Shares and
                        Unitron Options.

                   1.6       Restrictions on Transfer of Unitron Shares and
                             Unitron Options.

                        (a)       Transfer Restrictions. Each of the Unitron
                             Shareholders expressly agrees that, prior to
                             termination of this Agreement in accordance with
                             Section 8.1 hereof, such Shareholder will not,
                             without the express prior written consent of
                             Sabratek:

                             (i)       Directly or indirectly transfer, sell,
                                  assign, give, mortgage, pledge, hypothecate,
                                  encumber or otherwise dispose of, or permit to
                                  be sold, assigned, encumbered, attached or
                                  otherwise disposed of, in any manner, the
                                  whole or any part of the Unitron Shares or
                                  Unitron Options, or the certificate or
                                  certificates representing the same, or any
                                  interest therein, except as expressly set
                                  forth in this Agreement; provided, that a
                                  Unitron Shareholder may transfer all or part
                                  of its Unitron Shares or Unitron Options
                                  without any consideration to not more than
                                  three transferees, so long as any such
                                  transferee is either a trust, partnership or
                                  other entity solely for such Unitron
                                  Shareholder's benefit or such Shareholder's
                                  spouse, parent and/or descendant, and so long
                                  as such Shareholder obtains and furnishes to
                                  Sabratek, prior to any such transfer, a
                                  writing signed by the proposed transferee
                                  expressly acknowledging that such transferee
                                  shall be bound by the terms of this Agreement
                                  and that such Unitron Shares and Unitron
                                  Options are subject to the provisions of this
                                  Agreement with respect to the Call Option and
                                  the Put Option; or

                             (ii)      Enter into any voting trust, shareholder
                                  agreement or other understanding with any
                                  person with respect to the Unitron Shares or
                                  Unitron Options, except with Sabratek;
                                  provided, that this paragraph shall not affect
                                  the right of a Unitron Shareholder to vote for
                                  the election of directors or to exercise other
                                  customary rights of a shareholder with respect
                                  to Unitron prior to the Closing.


                                       5

<PAGE>   10
Any purported transfer or other action in violation of the foregoing
restrictions shall be null and void. Unitron shall not register on its books any
transfer or other disposition of Unitron Shares or Unitron Options other than in
accordance with the terms of this Agreement.

                        (b)       Legend. All certificates representing Unitron
                             Shares held by the Unitron Shareholders, and any
                             certificates for Unitron Shares issued on or after
                             the Effective Date in accordance with the terms of
                             this Agreement (including Unitron Shares issued
                             upon exercise of Unitron Options), shall contain or
                             be amended to contain substantially the following
                             legend, which shall bind Unitron, the Unitron
                             Shareholders and any persons asserting any interest
                             in the certificates and the Unitron Shares they
                             represent:

         The shares represented by this certificate and this certificate are
         subject to the terms of a certain Option Agreement dated January 22,
         1999 (the "Option Agreement"), by and among the holder of the shares
         represented by this certificate, Unitron Medical Communications, Inc.
         ("Unitron"), certain other shareholders of Unitron and Sabratek
         Corporation, a copy of which Option Agreement is on file at the
         principal office of Unitron. Neither this certificate nor the shares
         evidenced hereby nor any portion thereof or any interest therein may be
         offered, pledged, hypothecated, sold, gifted or otherwise transferred
         in violation of said Option Agreement, and any such purported transfer
         shall be null, void and of no effect. The shares represented by this
         certificate are subject to a Call Option and a Put Option granted under
         said Option Agreement.

                   1.7       Documents Evidencing Unitron Shares. Each of the
                        Unitron Shareholders upon entering into this Agreement
                        shall deliver or cause to be delivered (and Unitron will
                        so comply with such instructions) to a third party
                        escrow agent who is mutually acceptable to Sabratek and
                        Unitron a certificate or certificates evidencing all
                        Unitron Shares held by such Unitron Shareholder,
                        together with a stock power or stock powers for such
                        certificate(s), duly endorsed in blank for transfer.
                        Promptly following the execution of this Agreement, the
                        parties to this Agreement shall enter into an escrow
                        agreement in the form of Exhibit A attached hereto with
                        the mutually selected escrow agent (the "Certificates
                        Escrow Agreement"), and Unitron and Sabratek shall
                        equally share the fees and expenses of such escrow
                        agent. Upon receipt of any subsequently issued Unitron
                        Shares (including Unitron Shares issued upon exercise of
                        Unitron Options), each of the Unitron Shareholders shall
                        deliver or cause to be delivered to such escrow agent a
                        certificate or certificates evidencing all such Unitron
                        Shares (and Unitron shall so deliver any such
                        certificates), together with a



                                       6
<PAGE>   11

                        stock power or stock powers for such certificate(s),
                        duly endorsed in blank for transfer.

                   1.8       Unitron Options.

                        (a)         At the sole and absolute discretion of
                             Sabratek, each Unitron Option shall be (i)
                             terminated upon the Closing in exchange for the
                             consideration specified in Article 2 or (ii)
                             converted into an option to purchase Sabratek Stock
                             as provided in this Section; provided that such
                             conversion election may only be made by Sabratek
                             with respect to any Unitron Option upon the consent
                             of the respective Unitron Option holder (the
                             "Conversion Election").

                        (b)        At the Closing, each then outstanding Unitron
                             Option as to which the Conversion Election has been
                             validly exercised by Sabratek shall be converted
                             into an option (a "Sabratek Replacement Option") to
                             acquire the number of shares of Sabratek Stock
                             which the holder of such Unitron Option would have
                             been entitled to receive at the Closing had such
                             holder exercised such Unitron Option in full
                             immediately prior to the Closing. The exercise
                             price per share of the Sabratek Replacement Option
                             shall equal the aggregate exercise price of such
                             Unitron Option divided by the number of shares of
                             Sabratek Stock issuable upon exercise of the
                             Sabratek Replacement Option issued in lieu thereof.
                             Each Sabratek Replacement Option which is granted
                             to a person who becomes subsequent to the Closing
                             Date an employee of Sabratek shall vest in full and
                             be exercisable upon but not before the first
                             anniversary of the Closing contingent upon the
                             continued employment of the holder until such
                             vesting date and shall be exercisable until the
                             five year anniversary of the Closing; provided,
                             however, in the event the employment of such a
                             holder is terminated by Sabratek prior to such one
                             year anniversary without cause, the Sabratek
                             Replacement Option of such holder shall immediately
                             vest and be exercisable for a period of one month
                             following such termination of employment. Each
                             Sabratek Replacement Option which is granted to a
                             person who does not become subsequent to the
                             Closing Date an employee of Sabratek shall be fully
                             vested and immediately exercisable on the Closing
                             Date.

                                       7
<PAGE>   12

                        (c)        As soon as practicable following the Closing,
                             Sabratek shall deliver to each holder of a Unitron
                             Option for which the Conversion Election has been
                             duly made by Sabratek an option agreement
                             evidencing the Sabratek Replacement Option issued
                             in lieu thereof. Such option agreement shall be in
                             the customary form of, and contain the customary
                             terms in, the option agreement currently used by
                             Sabratek under its primary employee stock option
                             plan, except as may otherwise be expressly
                             contemplated by this Agreement, and any Sabratek
                             Replacement Option shall be subject to such plan.

                        (d)        Sabratek shall take all corporate action
                             necessary to reserve for issuance a sufficient
                             number of shares of Sabratek Stock for delivery on
                             exercise of all Sabratek Replacement Options issued
                             pursuant to this Section. As soon as reasonably
                             practicable after the Closing (but in any event
                             prior to the exercise of any Sabratek Replacement
                             Option), Sabratek shall file a registration
                             statement on Form S-8 (or any successor or other
                             appropriate form) with respect to the shares of
                             Sabratek Stock subject to the Sabratek Replacement
                             Options and shall use reasonable best efforts to
                             maintain the effectiveness of such registration
                             statement or registration statements for so long as
                             the Sabratek Replacement Options remain
                             outstanding.


                                     ARTICLE  2

                   DETERMINATION AND PAYMENT OF PURCHASE PRICE

                   2.1  Purchase Price for Unitron Shares and Unitron Options.

                        (a)        The purchase price (the "Share Purchase
                             Price") to be paid by Sabratek for all of the
                             Unitron Shares purchased pursuant to the Call
                             Option or the Put Option, as the case may be, shall
                             be an amount equal to (i) the Fixed Value of
                             Unitron (as defined below) plus the aggregate
                             exercise price of the unexercised portions of all
                             Unitron Options outstanding immediately prior to
                             the Closing, divided by (ii) the number of shares
                             of Unitron capital stock which are issued and
                             outstanding at the Closing, plus the number of
                             shares of Unitron capital stock which are issuable
                             upon the exercise of options, warrants or other
                             rights, plus the number of shares of Unitron
                             capital stock which are issuable upon the


                                       8
<PAGE>   13

                             conversion or exchange of other securities, plus
                             the number of any other equity securities or stock
                             appreciation or other rights (such quotient being
                             referred to herein as the "Fully Diluted Price Per
                             Share"), multiplied by (iii) the number of Unitron
                             Shares which are purchased by Sabratek at the
                             Closing, subject to Section 7.1. Each of the
                             Unitron Shareholders shall be entitled to his or
                             her proportionate share of the Share Purchase Price
                             based on the number of Unitron Shares being sold by
                             such Unitron Shareholder, subject to Section 7.1.

                        (b)        The purchase price (the "Option Purchase
                             Price") to be paid by Sabratek for each of the
                             Unitron Options (other than any Unitron Option for
                             which a Conversion Election has been duly made)
                             shall equal (i) the Fully Diluted Price Per Share,
                             less (ii) the exercise price per share of such
                             Unitron Option, multiplied by (iii) the number of
                             Unitron Shares obtainable upon exercise of such
                             Unitron Option immediately prior to the Closing in
                             accordance with the terms of such Unitron Option
                             (determined on a holder by holder basis), subject
                             to Section 7.1. If any option is not in-the-money
                             at the Closing (that is, the Fully Diluted Price
                             Per Share is equal to or less than the exercise
                             price per share of such option), then such option
                             shall be terminated at the Closing for no
                             consideration.

                        (c)        The "Fixed Value of Unitron" shall be an
                             amount equal to (i) $14,800,000 less (ii) the
                             amount (if any) by which the total of all legal
                             costs and expenses paid to or payable by Unitron to
                             Shumaker, Loop & Kendrick LLP from at any time
                             prior to the date of this Agreement through and
                             including the Closing in connection with this
                             transaction and any matters relating hereto (the
                             "Final Legal Expenses") exceed $125,000.

                        (d)        The aggregate Share Purchase Price and Option
                             Purchase Price (less any offset or escrow expressly
                             contemplated by this Agreement) is referred to
                             herein as the "Purchase Price."

                        (e)        The Purchase Price payable to each of the
                             Unitron Shareholders is subject to reduction for
                             the amount of any Damages (as hereinafter defined)
                             incurred or reasonably expected to be incurred by
                             Sabratek or Unitron (if any) proximately caused by
                             any material inaccuracy in any of the
                             representations and warranties of Unitron contained
                             in Section 6.2 (the "Damages



                                       9
<PAGE>   14

                             Offset"), as determined in accordance with Section
                             7.1 and as allocated among the Unitron Shareholders
                             in accordance with Section 7.1, but such offset
                             against the Purchase Price shall be subject to a
                             one-time deductible to be borne by Sabratek equal
                             to $250,000.

                        (f)        Notwithstanding the foregoing, the Purchase
                             Price otherwise payable to Frasca at the Closing
                             shall be reduced by an amount equal to the lesser
                             of (x) $2 million less the amount of any Damages
                             Offset pursuant to Section 7.1 made prior to or at
                             the Closing against the Purchase Price otherwise
                             payable to Frasca at the Closing and (y) $1
                             million, which amount shall be placed into escrow
                             and shall be dealt with by Frasca and Sabratek in
                             accordance with Section 7.2 of this Agreement and
                             Exhibit B attached hereto (the "Frasca Closing
                             Escrow"). If only Sabratek Stock is issued in
                             payment of the Purchase Price, the "amount" placed
                             into escrow as provided above shall be such number
                             of shares of Sabratek Stock (rounded up to the next
                             whole number of shares) as are equal in value to
                             such amount to be placed into escrow, with such
                             shares being valued at the Sabratek Average Closing
                             Price. If Sabratek Stock and cash is issued in
                             payment of the Purchase Price, the "amount" placed
                             into escrow as provided above shall consist of to
                             the extent possible shares of Sabratek Stock (that
                             is, if the Sabratek Stock portion of the Purchase
                             Price to be paid to Frasca is not of sufficient
                             value to satisfy the escrow obligation described
                             above, all of such Sabratek Stock and then cash
                             shall be placed in escrow), with such shares being
                             valued at the Sabratek Average Closing Price. The
                             Frasca Closing Escrow shall be governed by the
                             escrow agreement attached as Exhibit C hereto, and
                             the escrow agent with respect to the Frasca Closing
                             Escrow shall be mutually agreeable to Sabratek and
                             Frasca.

                   2.2  Payment of Purchase Price.

                        (a)        Full Payment at Closing.  The Purchase Price
                             shall be payable in full at the Closing, except as
                             otherwise expressly provided in this Agreement. At
                             the sole and absolute discretion of Sabratek, the
                             Purchase Price may be paid (x) in cash (or other
                             immediately available funds), (y) in that number of
                             shares of Sabratek Stock as are equal in value (as
                             contemplated by Section 2.2(c) below) to the
                             Purchase Price or (z) in cash and Sabratek Stock
                             (in such proportion as Sabratek in its sole
                             discretion may



                                       10
<PAGE>   15

                             determine) as are equal in value (as contemplated
                             by Section 2.2(c) below) to the Purchase Price;
                             provided, that if the per share price of Sabratek
                             Stock (as defined below) on the Sabratek Principal
                             Market (as defined below) is less than $10.00 per
                             share at the close of trading on any of the days in
                             the ten Trading Day (as defined below) period
                             ending on and including the third Trading Day prior
                             to Closing, the Unitron Representative Shareholders
                             shall have the option of requiring Sabratek to pay
                             the Purchase Price in cash or other immediately
                             available funds; provided further, that Sabratek
                             shall not be required to issue fractional shares of
                             Sabratek Stock to any of the Unitron Shareholders
                             and, at its option, may pay cash in lieu of issuing
                             a fractional share of Sabratek Stock to any Unitron
                             Shareholder otherwise entitled to receive such
                             fractional share. Notwithstanding the foregoing, in
                             the event Sabratek fails to deliver the Sabratek
                             Closing Representation (as hereinafter defined) in
                             accordance with the provisions of Section 3.4, then
                             the entire amount of the Purchase Price shall be
                             payable in cash or other immediately available
                             funds.

                        (b)       Sabratek Stock. For purposes of this
                             Agreement, the term "Sabratek Stock" means shares
                             of voting common stock of Sabratek which as of the
                             Closing: (i) constitute duly authorized, validly
                             issued, fully paid and non-assessable shares of
                             Sabratek's sole class of voting common stock; (ii)
                             have been listed for trading on the principal
                             securities exchange or other market on which the
                             common stock of Sabratek is then traded (which is
                             currently the Nasdaq National Market) (the
                             "Sabratek Principal Market"); and (iii) are covered
                             by the terms of the Registration Agreement.

                        (c)       Value of Sabratek Stock. For purposes of
                             determining the number of shares of Sabratek Stock
                             (if any) to be issued to the Unitron Shareholders
                             in payment of the Purchase Price, the value of each
                             share of Sabratek Stock as of the Closing shall
                             equal the greater of (i) the average of the per
                             share closing prices of a share of Sabratek Stock
                             on the Sabratek Principal Market, as reported in
                             The Wall Street Journal (Midwest edition), during
                             the 10 Trading Day (as defined below) period ending
                             on and including the third Trading Day prior to the
                             Closing Date (the "Sabratek Average Closing Price")
                             and (ii) $26.00 (the "Floor Price"). As used
                             herein, the term "Trading Day" means any day on
                             which the Sabratek Principal Market is open for
                             business. At the sole and absolute discretion of
                             Sabratek, the value of each share of Sabratek Stock


                                       11
<PAGE>   16

                             shall be equal to the Sabratek Average Closing
                             Price in lieu of the Floor Price as contemplated by
                             this subsection, and the rights of the Unitron
                             Shareholders specified under subsection (d) below
                             shall be null and void in such event and the
                             Unitron Shareholders will not be entitled to any
                             such rights.

                        (d)       Right to Additional Sabratek Stock.

                             (i)       If Sabratek Stock comprises all or part
                                  of the Purchase Price and if the Sabratek
                                  Average Closing Price is less than $26.00,
                                  then Sabratek shall pay to the Unitron
                                  Shareholders an amount equal to the Aggregate
                                  Stock Price Differential (as hereinafter
                                  defined) if and as provided in this
                                  subsection. Each Unitron Shareholder shall be
                                  entitled to a pro rata portion of the
                                  Aggregate Stock Price Differential in
                                  accordance with the respective amount of the
                                  Purchase Price such Unitron Shareholder
                                  received at the Closing; provided that (i) any
                                  holder of a Unitron Option who received a
                                  Sabratek Replacement Option at the Closing
                                  shall be deemed to have received a portion of
                                  the Purchase Price that would have been paid
                                  for the respective underlying Unitron Option
                                  had a Sabratek Replacement Option not been
                                  issued therefor and (ii) the amount if any
                                  amount placed into the Frasca Closing Escrow
                                  shall be deemed to have been part of the
                                  Purchase Price paid to Frasca at the Closing.
                                  The Aggregate Stock Price Differential shall
                                  be paid by Sabratek in Sabratek Stock on the
                                  fifth Trading Day after the Last Trading Day
                                  (as hereinafter defined), with each share of
                                  Sabratek Stock having a value equal to the 6
                                  Month Anniversary Average Closing Price (as
                                  hereinafter defined), except that cash shall
                                  be paid in lieu of any fractional share. This
                                  right of the Unitron Shareholders to the
                                  Aggregate Stock Price Differential is and
                                  shall be of no effect and is and shall be
                                  inoperative unless the per share closing price
                                  of a share of Sabratek Stock on the Sabratek
                                  Principal Market, as reported in The Wall
                                  Street Journal (Midwest edition), does not
                                  equal or exceed $26.00 on any 10 or more
                                  Trading Days in the period beginning on the
                                  Trading Day next following the Closing Date
                                  and ending on the last Trading Day in the 6
                                  month period immediately following the Closing
                                  Date (the last Trading Day of such period, the
                                  "Last Trading



                                       12
<PAGE>   17

                                  Day"). In the event of the Asset Acquisition
                                  Alternative (as hereinafter defined), Unitron
                                  in lieu of the Unitron Shareholders shall have
                                  a right if any to the Aggregate Stock Price
                                  Differential.

                            (ii)       "Aggregate Stock Price Differential"
                                  means (i) $26.00 less (ii) the 6 Month
                                  Anniversary Average Closing Price multiplied
                                  by (iii) the number of shares of Sabratek
                                  Stock issued at the Closing. "6 Month
                                  Anniversary Average Closing Price" means the
                                  average of the per share closing prices of a
                                  share of Sabratek Stock on the Sabratek
                                  Principal Market, as reported in The Wall
                                  Street Journal (Midwest edition), during the
                                  consecutive 10 Trading Days (as defined below)
                                  ending on the Last Trading Day.

                            (iii)      The right if any of a Unitron Shareholder
                                  to a portion of the Aggregate Stock Price
                                  Differential shall not be sold, assigned,
                                  pledged, gifted, conveyed, transferred or
                                  otherwise disposed of (a "Transfer") by any
                                  Unitron Shareholder, except by will or the
                                  laws of descent and distribution. Any Transfer
                                  in violation of this subsection shall be null
                                  and void.

                                   ARTICLE 3

                     CLOSING OF PURCHASE AND SALE OF SHARES

                   3.1       Closing. The Closing of the purchase and sale of
                        the Unitron Shares and the termination or conversion of
                        the Unitron Options pursuant to the exercise of the Call
                        Option or the Put Option, as the case may be, under this
                        Agreement shall take place on the Closing Date. The
                        Closing will be held at 10:00 a.m. local time on the
                        Closing Date at Kirkland & Ellis, 200 East Randolph
                        Drive, Chicago, Illinois or at such other time and place
                        as is mutually agreed to by Sabratek and Unitron.

                   3.2       Delivery of Certificates and Payment for Shares. At
                        the Closing, Sabratek will deliver to the Unitron
                        Shareholders the Purchase Price for the Unitron Shares
                        and the Unitron Options (other than any Unitron Option
                        for which a Conversion Election has been duly made) in
                        accordance with the terms of Article 2 hereof, subject
                        to the terms and conditions of this Agreement. The
                        Unitron Shareholders will deliver or cause to be
                        delivered certificates representing all of the Unitron
                        Shares to




                                       13
<PAGE>   18

                        be sold, duly endorsed or accompanied by stock powers
                        executed and in form sufficient to vest title thereto
                        fully in Sabratek, to the extent not theretofore
                        delivered to the escrow agent under the Certificates
                        Escrow Agreement, free and clear of all liens, claims
                        and encumbrances, and any option, warrant or other
                        agreement representing Unitron Options (together with a
                        letter of termination thereof by the respective option
                        holder) and Sabratek and the Unitron Representative
                        Shareholders shall jointly direct the escrow agent under
                        the Certificates Escrow Agreement to deliver the
                        contents of such escrow at the Closing to Sabratek
                        (which shall be free and clear of all liens, claims and
                        encumbrances), against delivery by Sabratek of the
                        applicable consideration to be paid with respect to such
                        Unitron Shares and Unitron Options. All deliveries made
                        at the Closing shall be deemed to be simultaneously
                        made, and no party shall be obligated to consummate the
                        transactions contemplated by this Agreement unless and
                        until all deliveries required hereunder have been fully
                        made. If Unitron or any Unitron Shareholder so fails or
                        refuses to deliver (or so fails to cause) the
                        certificates for his or her Unitron Shares or any
                        option, warrant or other agreement representing Unitron
                        Options (together with a letter of termination thereof
                        by the respective holder), as required under the terms
                        of this Agreement, then: (a) Sabratek shall deposit such
                        Unitron Shareholder's proportionate share of the
                        Purchase Price and/or other consideration with an escrow
                        agent reasonably acceptable to the Unitron
                        Representative Shareholders; (b) such escrow agent shall
                        hold the same against delivery by the Unitron
                        Shareholder of his or her duly endorsed certificates for
                        the Unitron Shares or option, warrant or other agreement
                        representing Unitron Options (together with a letter of
                        termination thereof by the respective holder), with all
                        fees and other expenses of the escrow agent chargeable
                        to such Unitron Shareholder; and (c) Unitron shall
                        adjust its transfer books to reflect the transfer of
                        such Unitron Shareholder's Unitron Shares to Sabratek.
                        Each of the Unitron Shareholders hereby appoints the
                        Unitron Representative Shareholders as his or her
                        attorney-in- fact to execute and deliver all such
                        documents and instruments as may be needed to convey the
                        Unitron Shareholder's Unitron Shares to Sabratek
                        pursuant to this Agreement if the Unitron Shareholder is
                        not present at the Closing. This power of attorney is
                        coupled with an interest and does not terminate on the
                        Unitron Shareholder's disability or death, and shall
                        continue in effect through the later of: (a) if this
                        Agreement terminates in accordance with Section 8.1 in
                        its entirety prior to Closing, the day immediately after
                        this Agreement terminates; or (b) if the Call Option or
                        the Put Option, as the case may be, is exercised, the
                        90th day following the Closing Date.



                                       14
<PAGE>   19

                   3.3       Election to Acquire Unitron Assets.

                        (a)       At the sole and absolute discretion of
                             Sabratek, Sabratek may elect to acquire from
                             Unitron all of its assets (the "Asset Acquisition
                             Alternative") in lieu of acquiring the Unitron
                             Shares and the Unitron Options pursuant to exercise
                             of the Call Option or the Put Option, and Unitron
                             shall sell, transfer, convey and deliver to
                             Sabratek such assets, for an amount to be paid to
                             Unitron (and not to the Unitron Shareholders) equal
                             to (the "Asset Acquisition Purchase Price"):

         (i) the Purchase Price; plus

         (ii) an amount equal to the liabilities and obligations of Unitron not
         assumed by Sabratek as expressly contemplated by this Section
         (including any liabilities or obligations with respect to any contract,
         agreement or commitment by and between Unitron and Sabratek or
         otherwise); plus

         (iii) an amount equal to the Unitron Cash Asset Sale Tax Liability if
         the Sabratek Average Closing Price is equal to or more than $26.00 and
         if Sabratek uses other than only Sabratek Stock as consideration in the
         Asset Acquisition Alternative; and plus

         (iv) an amount equal to the Differential Tax Liability if the Sabratek
         Average Closing Price Stock is less than $26.00 and Sabratek uses other
         than only Sabratek Stock as consideration in the Asset Acquisition
         Alternative (except for cash in lieu of fractional shares);

                  "Unitron Cash Asset Sale Tax Liability" means an amount equal
to the sum of: (i) any and all Federal, state and foreign income taxes imposed
on Unitron with regard to the sale of the assets of Unitron to Sabratek and any
assumption of Unitron liabilities by Sabratek as contemplated by the Asset
Acquisition Alternative, net of utilization of any net operating loss
carryforward or any other available tax offsets or credits; and (ii) plus any
and all Federal, state and foreign income taxes that would be imposed on Unitron
as a result of the payment by Sabratek of the Unitron Cash Asset Sale Tax
Liability.

                  "Differential Tax Liability" means an amount equal to the
excess of: (i) any and all Federal, state and foreign income taxes imposed on
Unitron with regard to the sale of the assets of Unitron to Sabratek and any
assumption of Unitron liabilities by Sabratek pursuant to the Asset Acquisition
Alternative, net of utilization of any net operating loss carryforward or any
other available tax offsets or credits (as such amount is estimated as of the
Closing in good faith by Sabratek and the Unitron Representative Shareholders),
over (ii) any and all Federal, state and foreign income taxes that would have
been imposed on Unitron with regard to the sale of the



                                       15
<PAGE>   20

assets of Unitron to Sabratek and any assumption of Unitron liabilities by
Sabratek pursuant to the Asset Acquisition Alternative had such asset sale
occurred on the Effective Date, net of utilization of any net operating loss
carryforward or any other available tax offsets or credits; plus any income
taxes imposed on Unitron as a result of the payment by Sabratek of the
Differential Tax Liability. Unitron and its auditors will (i) make available to
Sabratek and to the Unitron Representative Shareholders and their respective
agents, attorneys and accountants upon reasonable advance notice all records and
work papers necessary to calculate the Differential Tax Liability and (ii) allow
Sabratek and the Unitron Representative Shareholders and their respective
agents, attorneys and accountants upon reasonable advance notice to interview
any Unitron personnel or independent auditor personnel in connection with the
calculation of the Differential Tax Liability. If Sabratek and the Unitron
Representative Shareholders agree upon the Differential Tax Liability, such
amount will be conclusive and binding upon all parties.

                        (b)       Sabratek shall make the Asset Acquisition
                             Alternative by so specifying in the Call Exercise
                             Notice in the event the Call Option is exercised
                             or, in the event the Put Option is exercised, by
                             delivery of written notice to Unitron within 5
                             business days of receipt by Sabratek of the Put
                             Exercise Notice.

                        (c)       At the sole and absolute discretion of
                             Sabratek, the Asset Acquisition Purchase Price may
                             be paid (x) in cash (or other immediately available
                             funds), (y) in that number of shares of Sabratek
                             Stock as are equal in value to the Asset
                             Acquisition Purchase Price or (z) in cash and
                             Sabratek Stock (in such proportion as Sabratek in
                             its sole discretion may determine) as are equal in
                             value (as contemplated by Section 2.2(c) above) to
                             the Asset Acquisition Purchase Price; provided,
                             that if the per share price of Sabratek Stock on
                             the Sabratek Principal Market is less than $10.00
                             per share at the close of trading on any of the
                             days in the ten Trading Day period ending on and
                             including the third Trading Day prior to Closing,
                             the Unitron Representative Shareholders shall have
                             the option of requiring Sabratek to pay the Asset
                             Acquisition Purchase Price in cash or other
                             immediately available funds; provided further, that
                             Sabratek shall not be required to issue fractional
                             shares of Sabratek Stock and, at its option, may
                             pay cash in lieu of issuing a fractional share of
                             Sabratek Stock. For purposes of the foregoing,
                             Sabratek Stock shall be valued at the price
                             specified in Section 2.2(c). Notwithstanding the
                             foregoing, in the event Sabratek fails to deliver
                             the Sabratek Closing Representation in accordance
                             with the provisions of Section 3.4, then the entire
                             amount of the Asset



                                       16
<PAGE>   21

                             Acquisition Purchase Price shall be payable in cash
                             or other immediately available funds.

                        (d)       In the event Sabratek makes the Asset
                             Acquisition Alternative, at the Closing:

         (i) Unitron will execute, acknowledge (if appropriate) and deliver to
         Sabratek assignments (including intellectual property transfer
         documents) and bills of sale in a form reasonably satisfactory to
         Sabratek and such other instruments of sale, transfer, conveyance and
         assignment as Sabratek and its counsel reasonably may request;

         (ii) Sabratek will execute, acknowledge (if appropriate) and deliver to
         Unitron an assumption (in a form reasonably satisfactory to the Unitron
         Representative Shareholders) of the Unitron Liabilities, except that in
         the sole and absolute discretion of Sabratek, Sabratek may elect to not
         assume any Unitron Liabilities and to instead pay to Unitron the amount
         thereof as contemplated by subsection (a) above; and

         (iii) Sabratek will deliver to Unitron the Asset Acquisition Purchase
         Price.

                  "Unitron Liabilities" means all liabilities and obligations of
Unitron (whether known or unknown, whether asserted or unasserted, whether
absolute or contingent, whether accrued or unaccrued, whether liquidated or
unliquidated, and whether due or to become due), other than (i) any liabilities
or obligations of Unitron if and to the extent such relate to acts, omissions,
events or circumstances which occur on or before the Effective Date, except to
the extent such are disclosed in the Unitron disclosure schedule or in the
Balance Sheet, (ii) any liabilities or obligations of Unitron if and to the
extent that such liability or obligation arises from or relates to a breach of
any of the representations and warranties of Unitron in this Agreement or in any
agreement described specifically in the recitals to this Agreement and (iii) any
and all Federal, state and foreign income taxes imposed on Unitron with regard
to the sale of the assets of Unitron to Sabratek and any assumption of Unitron
liabilities by Sabratek as contemplated by the Asset Acquisition Alternative.

                  Sabratek shall pay to Unitron an amount equal to the Special
Unitron Tax Liability if the Sabratek Average Closing Price is equal to or more
than $26.00 and if Sabratek uses only Sabratek Stock as consideration in the
Asset Acquisition Alternative, but only if the Special Unitron Tax Liability is
actually incurred by Unitron, except that such payment obligation of Sabratek
shall be null and void if Unitron fails to timely liquidate after the Closing as
contemplated by the Code (as hereinafter defined), if the capitalization UK
Agreement to the extent such relates to US Ventures (as defined therein) is not
performed as specified therein or if Unitron fails to take any action or omits
to take any action after the Closing that causes the Special Unitron Tax
Liability to be incurred by Unitron. "Special Unitron Tax Liability" means an
amount equal to the sum of: (i) any and all Federal, state and foreign income
taxes imposed on



                                       17
<PAGE>   22

Unitron with regard to the sale of the assets of Unitron to Sabratek and any
assumption of Unitron liabilities by Sabratek as contemplated by the Asset
Acquisition Alternative, net of utilization of any net operating loss
carryforward or any other available tax offsets or credits; and (ii) plus any
and all Federal, state and foreign income taxes that would be imposed on Unitron
as a result of the payment by Sabratek of the Unitron Cash Asset Sale Tax
Liability.

                  With respect to any financial indebtedness of Unitron assumed
by Sabratek as provided above, Sabratek shall use its reasonable best efforts to
either (i) cause Unitron to be fully and forever released in a writing
reasonably satisfactory to Unitron from such indebtedness or (ii) fully satisfy
and discharge such indebtedness and provide Unitron with evidence thereof
satisfactory to Unitron before the two month anniversary of the Closing Date.

                        (e)       Except as otherwise provided in this
                             Agreement, at the Closing Sabratek shall offer
                             employment to all of the employees of Unitron on
                             terms substantially similar to those in effect for
                             each such respective employee, and neither Unitron
                             nor any Unitron Shareholder shall take any action
                             (or assist or encourage others in the taking of any
                             action) which would discourage any such Unitron
                             employee from accepting Sabratek's offer of
                             employment.

                        (f)       The parties intend that the offset, escrow,
                             indemnity and other obligations and rights of
                             Sabratek, Unitron and the Unitron Shareholders
                             under this Agreement be fully applicable and
                             retained by Sabratek, Unitron and the Unitron
                             Shareholders in the event of the Asset Acquisition
                             Alternative, and such provisions shall be
                             accordingly interpreted and construed.
                             Consequently, among other things the Asset
                             Acquisition Purchase Price shall be subject to
                             reduction for any Damages Offset and shall be
                             reduced by any consideration paid into the Frasca
                             Closing Escrow as contemplated by this Agreement.

                        (g)       If the consent or approval of any third party
                             is required for the assignment or transfer of any
                             agreement, contract, lease, license, permit or the
                             like to Sabratek hereunder as a result of the Asset
                             Acquisition Alternative and such consent or
                             approval has not been obtained prior to the
                             Closing, then Unitron shall continue to use its
                             reasonable best efforts (prior to the time Unitron
                             is liquidated) to obtain such consent or approval
                             following the Closing (but any such consent shall
                             not be a condition to the Closing) and, unless and
                             until such consent or approval has been obtained,
                             the parties shall work together to develop and
                             implement a legal and feasible arrangement under
                             which Sabratek will obtain



                                       18
<PAGE>   23

                             the benefits of, and be responsible for the
                             performance of, all of the obligations of Unitron
                             under, the agreement, contract, lease or license in
                             question.

                        (h)       Unitron and Sabratek shall equally share any
                             transfer and other similar taxes payable in
                             connection with the transfer to Sabratek of the
                             Unitron assets acquired by Sabratek upon the Asset
                             Acquisition Alternative; this provision does not
                             relate to any income or other tax related to the
                             sale of Unitron assets to Sabratek.

                        (i)       Unitron shall with due speed liquidate and
                             dissolve, and Unitron shall accomplish such
                             liquidation and dissolution and any distribution of
                             any of the Asset Acquisition Purchase Price to its
                             equity holders only in accordance with applicable
                             law.

                        (j)       The consummation of the Asset Acquisition
                             Alternative is also referred to herein as the
                             "Closing" and the date thereof as the "Closing
                             Date." Sabratek may transfer its rights under this
                             Agreement to acquire the assets of Unitron and to
                             assume certain liabilities of Unitron to a
                             wholly-owned subsidiary of Sabratek, and such
                             wholly-owned subsidiary shall acquire the assets of
                             Unitron and assume the liabilities of Unitron to be
                             assumed at the Closing for the Asset Acquisition
                             Purchase Price as contemplated by this Agreement.

                   3.4       Sabratek Closing Representation.  At the Closing,
                        if Sabratek Stock comprises all or any part of the
                        Purchase Price (or, in case of the Asset Acquisition
                        Alternative, if Sabratek Stock comprises the Asset
                        Acquisition Purchase Price), then Sabratek shall deliver
                        to Unitron (on behalf of the Unitron Shareholders) a
                        written statement, signed on behalf of Sabratek by the
                        Chief Financial Officer or the President of Sabratek and
                        dated as of the Closing Date (the "Sabratek Closing
                        Representation"), representing and warranting to the
                        Unitron Shareholders that: (i) there have been no
                        material adverse changes in Sabratek's financial
                        condition, results of operations, assets, liabilities,
                        business or prospects since the date of Sabratek's then
                        most recent periodic report (10-K, 10-Q or 8-K) filed
                        with the SEC; and (ii) that the Registration Agreement
                        is in full force and effect. Notwithstanding anything to
                        the contrary contained herein, delivery of the Sabratek
                        Closing Representation shall not be deemed to be a
                        condition to Closing, but the Closing shall proceed with
                        the Purchase




                                       19
<PAGE>   24

                        Price or the Asset Acquisition Purchase Price, as the
                        case may be, being payable only in cash or other
                        immediately available funds.

                  3.5        Final Legal Statements. At least 3 business days
                        prior to the Closing, Unitron shall cause to be
                        delivered to Sabratek a good faith estimate (which shall
                        be itemized by date and type of work performed) of the
                        Final Legal Expenses of Unitron, and at the Closing
                        Unitron shall cause to be delivered a similar final
                        legal bill which covers all such legal expenses through
                        the Closing.

                  3.6        Notices and Consents.  Unitron will give any
                        notices to third parties, and Unitron will use its
                        reasonable best efforts to obtain any third party
                        consents, that Sabratek reasonably may request in
                        connection with the consummation of the transactions
                        contemplated by this Agreement. Each of the parties will
                        give any notices to, make any filings with, and use its
                        reasonable best efforts to obtain any authorizations,
                        consents and approvals of governments and governmental
                        agencies in connection with the matters referred to in
                        Section 6.2(d) and Section 6.3(d).

                   3.7       Time. Time is of the essence of the provisions of
                        this Agreement relating to (a) the Closing Date for the
                        sale and purchase of the Unitron Shares and the Unitron
                        Options (or the consummation of the Asset Acquisition
                        Alternative) in strict accordance with the time periods
                        set forth in this Agreement; and (b) the payment of the
                        Purchase Price or the Asset Acquisition Purchase Price,
                        as the case may be, as and when due in accordance with
                        the provisions of this Agreement.

                   3.8       General; Assistance.  In case at any time after the
                        Closing any further action is necessary or desirable to
                        carry out the purposes of this Agreement, to facilitate
                        the operation and conduct of the business of Unitron and
                        to protect the intellectual property of Unitron, Frasca
                        and each of the other parties to this Agreement will
                        take such further action (including the execution and
                        delivery of such further instruments and documents) as
                        any other party reasonably may request, all at the sole
                        cost and expense of the requesting party (unless the
                        requesting party is entitled to indemnification therefor
                        under Section 7.2).



                                       20
<PAGE>   25

                                   ARTICLE 4

                              ADDITIONAL AGREEMENTS

                   4.1       Conduct of Unitron Business. From and after the
                        Effective Date, Unitron shall continue to carry on its
                        business only in the usual, regular and ordinary course
                        of business, as heretofore conducted, and by way of
                        amplification and not limitation, Unitron will not,
                        without the prior written consent of Sabratek or as
                        otherwise contemplated by this Agreement or the Software
                        License Agreement, dated July 1, 1997 by and between
                        Unitron and Sabratek (the "License Agreement"):

                        (a)       Declare or pay any dividend, or make any other
                             distribution with respect to its stock, to its
                             shareholders, whether in cash, stock or other
                             property, or redeem, purchase or otherwise acquire
                             any Unitron common stock or other Unitron capital
                             stock.

                        (b)       Pre-pay or discharge any indebtedness or other
                             obligations owing by Unitron to a Related Party (as
                             hereafter defined) or any third-party lender other
                             than the current portion of any principal payments
                             and interest due (other than to a Related Party) in
                             accordance with the terms of such indebtedness.

                        (c)       Issue any common stock or other capital stock
                             or any options, warrants or other rights to
                             subscribe for or purchase Unitron common stock or
                             any other Unitron capital stock or any securities
                             convertible into or exchangeable for any capital
                             stock of Unitron or any stock appreciation right or
                             equity linked security, except for the issuance of
                             capital stock upon the exercise of the Unitron
                             Options listed on the disclosure schedule
                             corresponding to Section 6.2(e)(ii).

                        (d)       Effect a reclassification, recapitalization,
                             spin-off, split-up, exchange of shares,
                             readjustment or other similar change in or to any
                             Unitron capital stock or otherwise reorganize or
                             recapitalize.

                        (e)       Amend or otherwise change its Amended and
                             Restated Articles of Incorporation as in effect on
                             the Effective Date.

                        (f)       Amend or otherwise change its Bylaws as in
                             effect on the Effective Date.



                                       21
<PAGE>   26

                        (g)       Enter into any new, or modify any existing,
                             employment agreement (including with any chief
                             executive officer of Unitron engaged or proposed to
                             be engaged pursuant to Section 4.4) or grant any
                             increase in the compensation payable or to become
                             payable to officers or salaried employees not in
                             accordance with past custom and practice, grant any
                             stock options (including to any chief executive
                             officer of Unitron engaged or proposed to be
                             engaged pursuant to Section 4.4) or, except as
                             required by law or contemplated by this Agreement,
                             adopt or make any change in any bonus, insurance,
                             pension, or other employee benefit plan, agreement
                             or arrangement made to, for or with any of such
                             officers or employees.

                        (h)       hire or terminate the employment of any chief
                             executive officer or president of Unitron.

                        (i)       Borrow or agree to borrow any amount of funds,
                             or directly or indirectly guarantee or agree to
                             guarantee any obligations of others, except for
                             trade debt incurred in the ordinary course of
                             business and in accordance with past custom and
                             practice and except for any borrowing made under
                             the Sabratek Credit Facility as contemplated by
                             Section 4.9.

                        (j)       Enter into or amend any material distribution,
                             marketing, license or similar agreement, contract
                             or commitment related to any Unitron product,
                             service or technology.

                        (k)       Enter into any agreement, contract, commitment
                             or other transaction with a Related Party or amend
                             or otherwise extend the term of any existing
                             agreement with a Related Party.

                        (l)       Place on any of its assets or properties any
                             mortgage, pledge, lien, charge, or other
                             encumbrance except for purchase money security
                             interests granted to the seller of any equipment
                             purchased by Unitron in the ordinary course of
                             business consistent with past custom and practice
                             or as otherwise permitted hereunder.

                        (m)       Merge, consolidate with, purchase
                             substantially all or any substantial part of the
                             assets of, or otherwise acquire any interest in,
                             any partnership, corporation, association or other
                             business organization or division thereof.

                                       22
<PAGE>   27

                        (n)       Sell, lease, license, sublicense or otherwise
                             dispose of any material intellectual property asset
                             or any material part of its tangible or intangible
                             assets.

                        (o)       Commit any act or fail to commit any act which
                             will cause a breach of any material agreement,
                             contract or commitment and which will have a
                             material adverse effect, in the aggregate, on
                             Unitron's business, financial condition, assets,
                             liabilities, properties or earnings.

                        (p)       Enter into any contract or agreement the term
                             of which is greater than one year or which requires
                             one or more payments that in the aggregate exceed
                             $50,000, but excluding any such contract or
                             agreement which has been approved by the Unitron
                             Board.

                        (q)       Make, or make any commitment for, any capital
                             expenditures exceeding $50,000 for any single
                             capital improvement, but excluding any such
                             contract or agreement which has been approved by
                             the Unitron Board.

                        (r)       Enter into or change the terms of any joint
                             venture, whether operational or developmental.

                        (s)       Enter into any commitment or agreement to do
                             any of the things prohibited by this Section 4.1.

         In addition, Unitron will not, without the prior written consent of the
Unitron Representative Shareholders, take any of the actions described above in
this Section, other than any of the actions described under the following
clauses: (g); (h); (i) and (l) if the referenced actions relate to borrowings
under the Sabratek Credit Facility; (j) and (n) if the referenced actions are
approved by the Unitron Board; and clause (s) with respect to each exception
described in this sentence. In addition, the prior written consent of the
Unitron Representative Shareholders shall not be required with respect to the
grant of any Unitron employee stock option approved by the Unitron Board. Any
consent of the Unitron Representative Shareholders required by this paragraph
shall not be unreasonable withheld or delayed.

                   4.2       Financial Information; Access.  From and after the
                        Effective Date, Unitron shall: (a) deliver to each of
                        the members of the Unitron Board and to the Unitron
                        Representative Shareholders copies of all internally
                        prepared monthly and quarterly financial statements as
                        soon as available but in any event within 30 days after
                        the end of each such period, as well as its year-end
                        financial statements as soon as available but in any
                        event



                                       23
<PAGE>   28

                        within 60 days after the end of each such period (the
                        Sabratek representative on the Unitron Board shall be
                        entitled to disclose any such financial statements to
                        any Sabratek director or officer and to any Sabratek
                        agent or representative); and (b) give Sabratek and the
                        Unitron Representative Shareholders (except that this
                        right of the Unitron Representative Shareholders shall
                        not change or remove in any respect the restrictions on
                        Frasca contained in the Frasca Separation Agreement) and
                        their respective authorized representatives full access
                        to any and all premises, properties, contracts,
                        commitments, books, records, tax returns and supporting
                        schedules or other documentation, and other information
                        pertaining to Unitron's business as Sabratek or the
                        Unitron Representative Shareholders may from time to
                        time reasonably request; provided, that such access
                        shall not unduly disrupt Unitron's normal business
                        activities. Sabratek shall have the right to conduct
                        such additional due diligence investigations of
                        Unitron's financial condition and affairs, and the
                        information set forth on the Unitron disclosure
                        schedules, as it may deem necessary and advisable to
                        determine whether the conditions to Closing set forth in
                        Section 5.1 hereof have been satisfied and to determine
                        if there exists any breach of any representation or
                        warranty of Unitron or any Unitron Shareholder, and the
                        Unitron Representative Shareholders shall have a similar
                        right with respect to any claim by Sabratek that a
                        condition to Closing is not satisfied or that there is a
                        breach of a Unitron representation or warranty. If this
                        Agreement is terminated prior to Closing, Sabratek and
                        its representatives will, upon written request therefor,
                        return to Unitron all financial statements, documents
                        and records (including all copies made thereof) obtained
                        from Unitron at any time in connection with the
                        transactions contemplated hereby.

                   4.3       Unitron Shareholder Solicitation.  As soon as
                        practicable following the Effective Date, Unitron shall
                        request (the "Shareholder Request") that each holder of
                        any capital stock or other equity interest or equity
                        related interest of Unitron (i) enter into this
                        Agreement and the Certificates Escrow Agreement, (ii)
                        execute and deliver to Sabratek a Regulation D
                        Questionnaire the substance of which is set forth in
                        Exhibit D (a "Regulation D Questionnaire") and (iii)
                        execute and deliver to Sabratek a Release Agreement in
                        favor of Unitron, Sabratek and certain Unitron agents
                        the substance of which is set forth in Exhibit E (a
                        "Release Agreement"), and Unitron shall use its
                        commercially reasonable efforts to cause the Necessary
                        Shareholder Parties to enter into this Agreement and the
                        Certificates Escrow Agreement and to execute and deliver
                        to Sabratek a Regulation D Questionnaire and a Release
                        Agreement prior to February 26, 1999. The Shareholder
                        Request shall be accompanied by (x) a letter

                                       24
<PAGE>   29
                        from and signed by Frasca, Sponaugle and Overby stating
                        that the transactions contemplated by this Agreement are
                        believed to be in the best interests of Unitron and the
                        Unitron Shareholders, recommending without reservation
                        that the shareholders of Unitron enter into this
                        Agreement and the Certificates Escrow Agreement and make
                        the deliveries specified in this Section, as well as (y)
                        all other appropriate and required disclosure documents
                        and information. A holder of a Unitron equity interest
                        or equity related interest shall become a party to this
                        Agreement and be entitled to rights contemplated hereby
                        only upon such holder delivering to Sabratek a duly
                        executed copy of this Agreement, the Certificates Escrow
                        Agreement, a Regulation D Questionnaire and a Release
                        Agreement. Notwithstanding the foregoing, Unitron shall
                        not request or otherwise solicit more than 35 holders of
                        Unitron equity interests that are not accredited (as
                        defined under Regulation D under the Securities Act) to
                        become a party to this Agreement and Unitron shall cause
                        the above described solicitation to be conducted in
                        accordance with applicable law. This Agreement
                        notwithstanding, Sabratek shall not be required to issue
                        any security as contemplated by this Agreement to more
                        than 35 such non-accredited investors.

                   4.4       Engagement of Unitron CEO. Unitron has and shall
                        continue to diligently search for a chief executive
                        officer, and Unitron shall use its reasonable best
                        efforts to hire a chief executive officer as soon as
                        reasonably possible after the Effective Date. The chief
                        executive officer shall report to the Unitron Board and
                        shall have full power and authority to manage the
                        business of Unitron, subject to the terms of this
                        Agreement. Any employment agreement to be entered into
                        by the new Unitron chief executive officer shall contain
                        an acknowledgment of such person of the restrictions on
                        Unitron contained in this Article 4.

                   4.5       Audit of Unitron Financial Statements. At the
                        election of Sabratek, the December 31, 1998 financial
                        statements and/or any other financial statements of
                        Unitron shall be audited by an independent accounting
                        firm selected by Sabratek, at the sole cost and expense
                        of Sabratek if Sabratek so demands such an audit, and
                        Unitron shall promptly cooperate in such audit. Unitron
                        shall grant such selected accountant access to its
                        books, records and employees and otherwise as customary
                        in connection with a year-end financial statement
                        audit.

                   4.6       Sabratek Reports.  From and after the Effective
                        Date, Sabratek will promptly deliver to each of the
                        Unitron Shareholders (at the address of




                                       25
<PAGE>   30

                        such Shareholder on the books and records of Unitron,
                        which address list shall be promptly provided by Unitron
                        to Sabratek upon request) copies of all materials
                        provided generally to its shareholders, and to each
                        Unitron Shareholder. Upon written request therefor,
                        Sabratek will also provide to any Unitron Shareholder
                        who so requests, on an individual basis, copies of all
                        other documents filed by Sabratek with the SEC.

                   4.7       Covenants by Unitron Affiliates With Respect to
                        Sabratek Stock.

                        (a)       Post-Closing Transfer Restriction.  Each
                             Affiliate (as hereinafter defined) of Unitron
                             hereby expressly agrees that, if Sabratek elects to
                             issue Sabratek Stock in payment of the Purchase
                             Price upon exercise of the Call Option or the Put
                             Option and if Sabratek obtains from KPMG Peat
                             Marwick LLP ("KPMG") or another nationally
                             recognized independent public accounting firm a
                             letter which states that Sabratek can account for
                             the acquisition of Unitron as a
                             pooling-of-interests transaction (as described
                             below), such Affiliate will not sell, transfer or
                             otherwise dispose of any shares of Sabratek Stock
                             owned by such Affiliate during the period beginning
                             30 days prior to the Closing and ending at such
                             time as financial statements that include at least
                             30 days of combined operations of Sabratek and
                             Unitron after the Closing Date shall have been
                             publicly reported by Sabratek. The foregoing
                             restriction on transfers by Affiliates of Unitron
                             shall be in addition to, and not in lieu of, any
                             securities law restrictions or any restrictions set
                             forth in the Registration Agreement. "Affiliate" of
                             any particular person means any other person
                             controlling, controlled by or under common control
                             with such particular person, where "control" means
                             the possession, directly or indirectly, of the
                             power to direct the management and policies of such
                             particular person whether through the ownership of
                             voting securities, contract or otherwise.

                        (b)       Exception to Restriction. The restriction set
                             forth in subsection (a) above shall not apply to a
                             sale, transfer or other disposition of Sabratek
                             Stock by an Affiliate of Unitron if, prior to such
                             disposition, such Affiliate delivers to Sabratek
                             the written opinion of a nationally recognized
                             independent public accounting firm to the effect
                             that: (i) the disposition contemplated by such
                             Affiliate will not cause the acquisition of Unitron
                             not to be treated as a pooling-of-interest
                             transaction for financial, accounting and
                             regulatory purposes in accordance with GAAP and the
                             rules and regulations of the SEC governing pooling
                             (the "SEC Pooling



                                       26
<PAGE>   31

                             Rules"); or (ii) the disposition contemplated by
                             such Affiliate will not affect Sabratek's treatment
                             of the acquisition of Unitron because the SEC
                             Pooling Rules do not permit pooling-of-interest
                             accounting.

                   4.8       HSR Filing. If then applicable to the acquisition
                        of Unitron or its assets, Unitron and Sabratek shall
                        cooperate and shall expeditiously file with the Federal
                        Trade Commission and the Department of Justice all
                        documents required under the Hart-Scott-Rodino Antitrust
                        Improvements Act of 1976, as amended (the "HSR Act"),
                        and required to obtain early termination of the
                        pre-merger notification waiting period in accordance
                        with the regulations issued pursuant to the HSR Act.

                   4.9       Additional Unitron Financing. In the event that
                        Unitron needs additional working capital, Unitron shall
                        seek to obtain such financing pursuant to the Standby
                        Senior Credit Facility and Security Agreement dated
                        October 16, 1998 by and between Unitron and Sabratek
                        (the "Sabratek Credit Facility"). Sabratek shall extend
                        financing to Unitron under the Sabratek Credit Facility
                        as requested by Unitron from time to time to cover the
                        ordinary and customary working capital needs of Unitron,
                        including trade payables and payroll, as ordinary and
                        customary are determined by the chief executive officer
                        of Unitron in good faith, subject to the approval of
                        Sabratek, which approval shall not be unreasonably
                        withheld; provided that Sabratek shall have no
                        obligation to extend such financing to Unitron under the
                        Sabratek Credit Facility until such time as Unitron has
                        made all filings and has taken all other actions
                        requested by Sabratek pursuant to Section 4.2 of the
                        Sabratek Credit Facility and has duly signed the
                        promissory note related thereto with respect to all
                        advances made under such Facility prior to the date of
                        this Agreement. In the event that additional working
                        capital or other financing is obtained by Unitron other
                        than from Sabratek, Unitron shall not obtain such
                        financing from anyone who would be adverse to Sabratek's
                        competitive position in the market.

                  4.10       Public and Other Statements. Sabratek, Unitron and
                        each of the Unitron Shareholders hereby agrees to speak
                        only highly of the other parties to this Agreement,
                        except as may be expressly contemplated by this
                        Agreement or as may be necessary or appropriate to
                        comply with applicable law (including any securities
                        laws and any reporting requirements thereunder) or court
                        order or in connection with any arbitration or
                        accounting dispute pursuant to this Agreement.



                                       27
<PAGE>   32

                  4.11       Unitron Legal Opinion. Upon the execution of this
                        Agreement, Unitron shall cause Johnson, Blakely, Pope,
                        Bokor, Ruppel & Burns, P.A. ("Johnson, Blakely") to
                        deliver to Sabratek opinions as to the matters set forth
                        in Exhibit F attached hereto, addressed to Sabratek and
                        dated as of the date hereof, subject to customary
                        qualifications and limitations.

                  4.12       Sabratek Legal Opinion. Upon the execution of this
                        Agreement, Sabratek shall cause Kirkland & Ellis to
                        deliver to Unitron opinions as to the matters set forth
                        in Exhibit G attached hereto, addressed to Unitron and
                        dated as of the date hereof, subject to customary
                        qualifications and limitations.

                  4.13       Unitron Special Meeting. Unitron shall duly hold a
                        special meeting of the shareholders of Unitron (the
                        "Unitron Special Meeting") as soon as possible (but in
                        any event prior to February 26, 1999) and at such
                        Special Meeting this Agreement and the transactions
                        contemplated hereby shall be submitted for the adoption
                        and approval of the shareholders of Unitron. The Unitron
                        Board shall recommend that the Unitron stockholders
                        adopt and approve this Agreement and the transactions
                        contemplated hereby. Such approval may also be obtained
                        by Unitron pursuant to (i) a duly adopted written
                        consent of Unitron shareholders by the above specified
                        date or (ii) in any other manner permissible under
                        applicable law and in accordance with the bylaws and
                        charter of Unitron.

                  4.14       Waiver of Known Breaches.  Unitron hereby waives
                        any breach, default or other noncompliance by Sabratek
                        that is known to Unitron and/or Frasca as of the
                        Effective Date with respect to any of the current
                        agreements between Unitron and Sabratek. Sabratek hereby
                        waives any breach, default or other noncompliance by
                        Unitron or Frasca that is known to Sabratek with respect
                        to any of the current agreements between Unitron and
                        Sabratek (including Section 4.2 of the Sabratek Credit
                        Facility immediately upon but only upon the compliance
                        with such Section by Unitron).

                  4.15       Unitron Source Code.  From and after the Effective
                        Date, Unitron, Sabratek and the Unitron Representative
                        Shareholders agree that the Unitron operating software
                        code (and all updates thereto), including the associated
                        source codes and technical documentation related
                        thereto, shall be maintained in the secured computer
                        room at the principal business facility of Unitron (a
                        duplicate version of which shall be maintained at the
                        existing Unitron bank vault and in the fire proof safe
                        at the law firm of




                                       28
<PAGE>   33

                        Johnson, Blakely) until the Closing Date, except as may
                        otherwise be approved by such parties.

              4.16           Transactions in Sabratek Stock by Unitron
                        Shareholders. Each Unitron Shareholder agrees to not
                        buy, sell or otherwise trade Sabratek Stock prior to the
                        public announcement of this transaction by Sabratek,
                        except upon the prior written consent of Sabratek.

              4.17           Release of Sponaugle. At the Closing, Sabratek
                        shall execute and deliver to Sponaugle a general release
                        in form and substance similar to that given by Sabratek
                        to Frasca in the Separation Agreement recited at the
                        beginning of this Agreement.

              4.18           Buyout of Non-Accredited Investors.  Overby and
                        Sponaugle hereby covenant and agree to acquire prior to
                        the Unitron Special Meeting (or the delivery of an
                        equivalent written consent of Unitron shareholders to
                        Unitron) the equity interests of a number of Unitron
                        equity holders that are not accredited (as defined under
                        Regulation D under the Securities Act) such that not
                        more than 35 Unitron equity holders that are not so
                        accredited exist at the time of the Unitron Special
                        Meeting (or the delivery of an equivalent written
                        consent of Unitron shareholders to Unitron) and the
                        Closing.

              4.19           Covenants Concerning Continuity of Business
                        Enterprise. If Sabratek elects the Asset Acquisition
                        Alternative and uses Sabratek Stock as consideration
                        pursuant to this Agreement, Sabratek represents and
                        warrants that it currently intends to continue at least
                        one significant historic business line of Unitron, or
                        use at least a significant portion of its historic
                        business assets in a business, in each case within the
                        meaning of Treasury Regulations Section 1.368-1(d). No
                        party hereto shall take any action, or cause any action
                        to be taken, prior to the Closing that would cause
                        Unitron to fail to have at least one significant
                        historic business line and at least a significant
                        portion of its historic business assets in a business,
                        all within the meaning of Treasury Regulations Section
                        1.368-1(d)(4)(ii). If Sabratek elects the Asset
                        Acquisition Alternative and uses Sabratek Stock as
                        consideration pursuant to this Agreement, the parties
                        hereto shall use their reasonable commercial efforts,
                        which shall not include the requirement to pay any
                        additional consideration or incur


                                       29
<PAGE>   34

                        any additional liability or expense, to cause the Asset
                        Acquisition Alternative to qualify as a tax deferred
                        reorganization under Section 368 of the Internal Revenue
                        Code of 1986, as amended (the "Code").


                        4.20      Sexual Harassment Policy. Promptly following
                             the Effective Date, the Unitron Board shall approve
                             and implement a customary sexual harassment policy.


                                   ARTICLE 5.

                              CONDITIONS TO CLOSING

         Subsequent to the Call Exercise Notice or the Put Exercise Notice, each
of the parties will use his or its reasonable best efforts to take all action
and to do all things necessary, proper or advisable in order to consummate and
make effective the transactions contemplated by this Agreement (including
satisfaction, but not waiver, of the closing conditions set forth below).

                  5.1        Conditions to Obligation of Sabratek.  The
                        obligation of Sabratek to purchase the Unitron Shares
                        and the Unitron Options upon exercise of the Call Option
                        or the Put Option, as the case may be, or the Unitron
                        assets in the case of the Asset Acquisition Alternative,
                        shall be subject to the satisfaction of each of the
                        following conditions at or before the Closing (unless
                        waived by Sabratek):

                        (a)       Representations and Warranties of Unitron
                             Shareholders. The representations and warranties of
                             the Unitron Shareholders set forth in Section 6.1
                             shall be true and correct in all material respects
                             on and as of the Closing Date as though such
                             representations and warranties had been made on and
                             as of the Closing Date.

                        (b)       Operational Representations and Covenants.
                             Unitron shall have complied in all material
                             respects with the covenants of Unitron set forth in
                             this Agreement. The representations and warranties
                             of Unitron set forth in Section 6.2 shall be true
                             and correct in all material respects on and as of
                             the Effective Date; provided that this closing
                             condition shall lapse 60 days after the Unitron
                             Representative Shareholders notify Sabratek in
                             writing that the Necessary Shareholder Parties have
                             become a party to this Agreement in accordance with
                             the terms of this Agreement, unless Sabratek shall
                             have on or prior to such date notified Unitron in



                                       30
<PAGE>   35

                             writing that Sabratek believes that such closing
                             condition is not satisfied (which notice shall
                             specify in reasonable detail the basis of Sabratek
                             for such claim). The following shall apply in such
                             event:

                             (i)       Upon actual receipt of such notice, the
                                  Unitron Representative Shareholders shall have
                                  10 days to dispute such claim by giving
                                  written notice to Sabratek specifying in
                                  reasonable detail the basis for the dispute.
                                  If, within the 10 day period referred to
                                  above, the Unitron Representative Shareholders
                                  give a dispute notice to Sabratek, Sabratek
                                  and the Unitron Representative Shareholders
                                  shall undertake to obtain as promptly as
                                  practicable a final resolution of the dispute.
                                  If Sabratek and the Unitron Representative
                                  Shareholders are unable to resolve such
                                  dispute within 10 days after the delivery to
                                  Sabratek of the dispute notice, then Sabratek
                                  and the Unitron Representative Shareholders
                                  shall submit such dispute to arbitration in
                                  accordance with Section 9.1 of this Agreement
                                  and this Section 5.1(b). The determination of
                                  the arbitrator as to such dispute shall be
                                  final and binding for all purposes of this
                                  Agreement.

                             (ii)      If such arbitrator determines that (i)
                                  this closing condition is not satisfied, then
                                  Sabratek may terminate this Agreement or (ii)
                                  this closing condition is satisfied, then this
                                  closing condition shall lapse and be of no
                                  force or effect.

                        (c)       Performance of this Agreement. Unitron and the
                             Unitron Shareholders shall have performed and
                             complied in all material respects with all other
                             covenants and agreements required by this Agreement
                             to be performed or complied with by them prior to
                             or on the Closing Date.

                        (d)       Limited Solicitation. There shall not have
                             been solicited by Unitron more than 35 Unitron
                             equity holders that are not accredited (as defined
                             under Regulation D under the Securities Act) to
                             become a party to this Agreement.

                        (e)       Consents, Regulatory Filings and Approvals.
                             All consents, approvals, licenses and permits, the
                             granting or transfer of which



                                       31
<PAGE>   36

                             are necessary for the consummation of the
                             transactions contemplated hereby and for the
                             operation of Unitron's business by Sabratek
                             following the Closing, shall have been obtained or
                             transferred, as applicable. All applicable waiting
                             periods and any extensions thereof under the HSR
                             Act shall have expired or otherwise been
                             terminated.

                        (f)       Litigation, Injunctions. No order of any court
                             or administrative agency shall be in effect which
                             restrains or prohibits the transactions
                             contemplated hereby or which would limit or affect
                             in any material respect Sabratek's ownership or
                             control of Unitron, and there shall not have been
                             threatened, nor shall there be pending, any action
                             or proceeding by or before any court or
                             governmental agency or other regulatory or
                             administrative agency or commission challenging any
                             of the transactions contemplated by this Agreement.

                        (g)       Assignments. Unitron shall have executed and
                             delivered to Sabratek all such assignments and
                             other instruments of sale, transfer, conveyance and
                             assignment of the assets of Unitron.

                        (h)       Closing Certificate. The chief executive
                             officer of Unitron (or the most senior officer of
                             Unitron in the event there is no chief executive
                             officer) shall have delivered to Sabratek a
                             certificate to the effect that each of the
                             conditions specified above is satisfied in all
                             respects.

                   5.2       Conditions to Obligations of Unitron and the
                        Unitron Shareholders.  The obligation of each of the
                        Unitron Shareholders to sell their Unitron Shares and
                        Unitron Options upon exercise of the Call Option or the
                        Put Option or the obligation of Unitron to transfer its
                        assets to Sabratek in the case of the Asset Acquisition
                        Alternative shall be subject to the satisfaction of each
                        of the following conditions on or before the Closing
                        (unless waived in writing by a Unitron Shareholder or,
                        in the case of the Asset Acquisition Alternative, by
                        Unitron):

                        (a)       Representations and Warranties. The
                             representations and warranties of Sabratek
                             contained in this Agreement shall be true and
                             correct in all material respects on and as of the
                             Closing Date as though such representations and
                             warranties had been made on and as of the Closing
                             Date.



                                       32
<PAGE>   37
                        (b)       Performance of this Agreement. Sabratek shall
                             have performed and complied in all material
                             respects with all covenants, conditions and
                             agreements required by this Agreement to be
                             performed or complied with by it prior to or on the
                             Closing Date.

                        (c)       Consents, Regulatory Filings and Approvals.
                             All consents, approvals, licenses and permits, the
                             granting or transfer of which are necessary for the
                             consummation of the transactions contemplated
                             hereby, shall have been obtained or transferred, as
                             applicable. All applicable waiting periods and any
                             extensions thereof under the HSR Act shall have
                             expired or otherwise been terminated.

                        (d)       Litigation, Injunctions.  No order of any
                             court or administrative agency shall be in effect
                             which restrains or prohibits the transactions
                             contemplated hereby, and there shall not have been
                             threatened, nor shall there be pending, any action
                             or proceeding by or before any court or
                             governmental agency or other regulatory or
                             administrative agency or commission challenging any
                             of the transactions contemplated by this Agreement.

                        (e)       Closing Certificate. The president or chief
                             financial officer of Sabratek shall have delivered
                             to Unitron and to the Unitron Representative
                             Shareholders a certificate to the effect that each
                             of the conditions specified above is satisfied in
                             all respects.

                                   ARTICLE 6

                         REPRESENTATIONS AND WARRANTIES


                   6.1       Representations and Warranties of Unitron
                        Shareholders. Each of the Unitron Shareholders hereby
                        individually, for himself only and not for any of the
                        other Unitron Shareholders, represents and warrants to
                        Sabratek that the following statements are true and
                        complete as of the Effective Date and will be correct
                        and complete as of the Closing Date (as though made then
                        and as though the Closing Date were substituted for the
                        date of this Agreement throughout this Section):





                                       33
<PAGE>   38

                        (a)       Execution, Delivery and Validity. Such Unitron
                             Shareholder has full capacity, power and authority
                             to make, execute, deliver, perform and consummate
                             this Agreement and the other documents and
                             instruments required or contemplated by this
                             Agreement (including the Release Agreement and the
                             Certificates Escrow Agreement). This Agreement, the
                             Release Agreement and the Certificates Escrow
                             Agreement have been duly executed and delivered by
                             such Unitron Shareholder and constitute legal,
                             valid and binding obligations of such Shareholder,
                             enforceable against such Shareholder in accordance
                             with their respective terms.

                        (b)       Ownership of Shares. Such Unitron Shareholder
                             is the lawful record and beneficial owner of that
                             number of Unitron Shares which is set forth
                             opposite such Shareholder's name on the disclosure
                             schedule corresponding to this Section 6.1(b) and
                             that number of Unitron Options which is set forth
                             opposite such Shareholder's name on the disclosure
                             schedule corresponding to Section 6.2(e)(ii). Such
                             Unitron Shareholder owns no other equity interest
                             in Unitron other than as is set forth opposite the
                             name of such Shareholder on such schedules. Such
                             Unitron Shareholder is in possession of
                             certificates evidencing his ownership of the
                             Unitron Shares owned by him (or has delivered to
                             Unitron a duly executed lost certificate affidavit
                             which complies with the requirements of the Unitron
                             bylaws), all of which are fully paid and
                             non-assessable, and of option or other agreements
                             representing the Unitron Options owned by him. Such
                             Unitron Shareholder has good title to the Unitron
                             Shares (including Unitron Shares issued upon
                             exercise of Unitron Options) and Unitron Options
                             owned by him, with no restrictions on voting rights
                             and the other incidents of record and beneficial
                             ownership, and the absolute right to sell and
                             transfer such free and clear of all claims, liens,
                             pledges, security interests, restrictions or
                             encumbrances of any nature whatsoever. Except as
                             set forth on the disclosure schedule corresponding
                             to this Section 6.1(b), there are no voting trusts,
                             shareholder agreements or other understandings
                             between such Unitron Shareholder and any other
                             person or entity with respect to the voting of or
                             any other matters with respect to the Unitron
                             Shares or Unitron Options owned by such Unitron
                             Shareholder. Upon consummation of the purchase and
                             sale of the Unitron Shares and Unitron Options
                             pursuant to this Agreement, such Unitron
                             Shareholder will convey to Sabratek good and
                             marketable title to the Unitron Shares



                                       34
<PAGE>   39

                             (including Unitron Shares issued upon exercise of
                             Unitron Options) and Unitron Options, owned by such
                             Shareholder, free and clear of all claims, liens,
                             pledges, security interests, restrictions or
                             encumbrances of any nature whatsoever.

                        (c)       Investment Representations.

                             (i)       Each Unitron Shareholder has received and
                                  reviewed a copy of this Agreement, the Release
                                  Agreement, the Certificates Escrow Agreement
                                  and the Sabratek offering memorandum relating
                                  to this Agreement and the other terms and
                                  conditions of the transactions contemplated
                                  thereby (such offering memorandum and all
                                  exhibits and schedules referred to therein or
                                  attached thereto, together with any amendments
                                  or supplements thereto, being referred to as
                                  the "Memorandum"), including information
                                  regarding Sabratek, and has received or had
                                  access to any other information he deems
                                  necessary or appropriate to evaluate the
                                  merits and risks of his potential investment
                                  in the Put Option and his potential investment
                                  in Sabratek Stock. Each Unitron Shareholder
                                  acknowledges that (A) Sabratek has made
                                  available to him and his purchaser
                                  representative, if any, the opportunity to
                                  obtain additional information to verify the
                                  accuracy of the information contained in the
                                  Memorandum and to evaluate the merits and
                                  risks of the investments contemplated by this
                                  Agreement; (B) he and his purchaser
                                  representative, if any, have had the
                                  opportunity to ask questions of and receive
                                  answers from the officers of Sabratek, or a
                                  person or persons acting on behalf of
                                  Sabratek, concerning the terms and conditions
                                  of the offering, the Put Option, the
                                  acquisition of the Unitron equity by Sabratek,
                                  the Asset Acquisition Alternative, the
                                  Sabratek Stock and the information contained
                                  in the Memorandum, have received fully
                                  satisfactory answers to such questions, and
                                  have had the opportunity to inspect and copy
                                  all material documents relating to the
                                  offering; and (C) no time limits have been
                                  placed on him or his purchaser representative,
                                  if any, on consideration of the execution and
                                  delivery of this Agreement, the Release
                                  Agreement, the Certificates Escrow Agreement
                                  and the potential offering of Sabratek Stock
                                  relating thereto.



                                       35
<PAGE>   40

                            (ii)       Each Unitron Shareholder, alone or in
                                  connection with his purchaser representative,
                                  if any, has such knowledge and experience in
                                  financial and business matters to enable him
                                  to utilize the information made available to
                                  him to evaluate the risks and merits of his
                                  potential investment in the Put Option and his
                                  potential investment in the Sabratek Stock
                                  (together, the "Securities"), whether
                                  occurring upon exercise of the Call Option or
                                  the Put Option or otherwise, and to make an
                                  informed decision with respect thereto. Each
                                  Unitron Shareholder is an "accredited
                                  investor" except as any Unitron Shareholder
                                  may indicate on its Regulation D Questionnaire
                                  delivered to Sabratek. Each Unitron
                                  Shareholder who is a natural person is at
                                  least 21 years of age.

                            (iii)      Each Unitron Shareholder understands that
                                  the Securities he may acquire upon the
                                  acquisition contemplated by this Agreement
                                  will not have been registered under the
                                  Securities Act, any state statute governing
                                  securities regulation, or other applicable
                                  securities laws, rules and regulations, in
                                  reliance upon exemptions therefrom. Such
                                  reliance is in part predicated upon the truth
                                  and accuracy of the representations of the
                                  Unitron Shareholders contained herein. The
                                  Memorandum has not been reviewed, approved or
                                  disapproved by the SEC or any other federal or
                                  state agency, nor has any agency passed upon
                                  the Memorandum's accuracy or adequacy or the
                                  merits or value of the Securities or the
                                  Purchase Price for the Unitron Shares. Each
                                  Unitron Shareholder understands that the
                                  Unitron Shares and the Put Option which are
                                  owned by him must be held until the Closing of
                                  the acquisition contemplated by this Agreement
                                  or the termination of this Agreement, that his
                                  Unitron Shares and the Put Option may not be
                                  sold or otherwise transferred by him in any
                                  manner, and that this Agreement requires him
                                  to surrender his certificates representing
                                  Unitron Shares to Unitron pending Closing of
                                  the acquisition contemplated by this Agreement
                                  or termination of this Agreement.

                            (iv)       The Securities are being acquired solely
                                  for each



                                       36
<PAGE>   41

                                  Unitron Shareholder's own account for
                                  investment and not for the account of any
                                  other person and not with a view to
                                  distribution, assignment or resale to others,
                                  and no other person has a direct or indirect
                                  beneficial interest in the Securities. Each
                                  Unitron Shareholder acknowledges that he is
                                  not participating, directly or indirectly, in
                                  a distribution of the Securities or in the
                                  underwriting of any such distribution or
                                  transfer, and he will not act in any way that
                                  would constitute him to be an underwriter,
                                  within the meaning of the Securities Act.

                            (v)        Each Unitron Shareholder acknowledges
                                  that he has not been solicited to acquire the
                                  Securities by means of general advertising or
                                  general solicitation.

                            (vi)       Each Unitron Shareholder represents that
                                  no guarantees or representations have been
                                  made to him or his purchaser representative,
                                  if any, regarding the tax treatment of any
                                  part of the offering or of any of the
                                  transactions described in the Memorandum.

                        (d)       Securities Law Acknowledgment. Sabratek has
                             not publicly announced the transactions
                             contemplated by this Agreement. Each Unitron
                             Shareholder acknowledges that it is subject to
                             federal and state securities law restrictions with
                             respect to the Sabratek Stock until such time as
                             Sabratek publicly announces the transactions
                             contemplated by this Agreement.

                  6.2        Representations and Warranties of Unitron. Unitron
                         hereby represents and warrants to Sabratek that the
                         following statements are true and complete as of the
                         Effective Date, except as set forth in the disclosure
                         schedule delivered by Unitron to Sabratek on the date
                         hereof and initialed by Unitron and Sabratek. The
                         representations and warranties given by Unitron in this
                         Section 6.2 are certified by Frasca in his capacity as
                         the chief executive officer of Unitron, but not
                         individually.

                         (a)      Organization and Existence of Unitron. Unitron
                              is duly organized and validly existing under the
                              laws of the laws of the State of Florida, with all
                              requisite power and authority to own all of its
                              properties and assets and to carry on its business
                              as it is now




                                 37
<PAGE>   42

                             being conducted. Unitron is duly qualified to do
                             business and is in good standing in all
                             jurisdictions where the nature of its business
                             makes such qualification necessary, except where
                             the failure to be so qualified would not have a
                             material adverse effect on Unitron. Unitron does
                             not own, directly or indirectly, any capital stock
                             of any other corporation or any equity, profit
                             sharing, participation or other interest in any
                             corporation, limited liability company,
                             partnership, joint venture or other entity, except
                             as set forth in the disclosure schedule with
                             respect to this Section.

                        (b)       Execution, Delivery and Validity. Unitron has
                             full right, power and authority to make, execute,
                             deliver, perform and consummate this Agreement and
                             the other documents and instruments required or
                             contemplated by this Agreement. The execution,
                             delivery and performance of this Agreement and all
                             other agreements and instruments contemplated
                             hereby to which Unitron is a party have been duly
                             authorized and approved by the Unitron Board. This
                             Agreement and all other agreements and instruments
                             contemplated hereby to which Unitron is a party
                             have been duly and validly executed and delivered
                             by Unitron, and each constitutes the legal, valid
                             and binding obligations of Unitron, enforceable
                             against Unitron in accordance with its terms.

                        (c)       Non-Contravention. The execution, delivery and
                             performance of this Agreement and the consummation
                             of the transactions contemplated hereby or
                             compliance with or fulfillment of the terms and
                             provisions hereof or of any other agreement or
                             instrument contemplated hereby, do not and will
                             not: (i) conflict with or result in a breach of any
                             of the provisions of the Amended and Restated
                             Articles of Incorporation or By-Laws of Unitron or
                             any agreement among the Unitron Shareholders and
                             Unitron with respect to the Unitron Shares or the
                             Unitron Options; (ii) contravene in any material
                             respect any law, rule or regulation or any order,
                             writ, award, judgment, decree or other
                             determination which affects or binds any of Unitron
                             or any of its properties; or (iii) except as set
                             forth on the disclosure schedule corresponding to
                             this Section, conflict with, result in a breach of,
                             constitute a default under, or give rise to a right
                             of acceleration, termination or the imposition of
                             penalties under any material contract, deed of
                             trust, mortgage, trust, lease, governmental or
                             other license, permit or other authorization,
                             contract, agreement, note or any other



                                       38
<PAGE>   43

                             agreement, instrument or restriction to which
                             Unitron is a party or by which any of its
                             properties may be affected or bound.

                        (d)       Consents. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             no material authorization, consent, approval,
                             permit or license of, or filing or registration
                             with, any governmental or public body or authority,
                             any lender or lessor or any other person is
                             required to authorize, or is required in connection
                             with, the execution, delivery and performance by
                             Unitron of this Agreement or the agreements
                             contemplated hereby.

                        (e)       Capitalization of Unitron

                             (i)       As of the Effective Date, the authorized
                                  capital stock of Unitron consisted of 800,000
                                  shares of Class A Common Stock, $0.01 par
                                  value, of which 221,202 shares are issued and
                                  outstanding, and 200,000 shares of Class B
                                  Common Stock, $0.01 par value, of which
                                  179,480 shares are issued and outstanding. The
                                  Class A Common Stock and Class B Common Stock
                                  are identical except for voting rights. All of
                                  the issued and outstanding shares of Unitron
                                  Class A Common Stock and Class B Common Stock
                                  have been duly authorized and are validly
                                  issued, fully paid and non-assessable. Set
                                  forth on the disclosure schedule corresponding
                                  to this Section is a true and correct list of
                                  each of the holders of capital stock of
                                  Unitron, the number of shares of capital stock
                                  of each such holder and the class of capital
                                  stock of each such holder.

                             (ii)      Set forth on the disclosure schedule
                                  corresponding to this Section is a true,
                                  complete and correct list of all options,
                                  warrants and equity appreciation and other
                                  equity linked rights of Unitron, which
                                  constitute, as of the Effective Date, all of
                                  the issued and outstanding options, warrants,
                                  purchase rights, subscription rights,
                                  conversion rights, exchange rights, equity
                                  appreciation, or other equity linked rights or
                                  other contracts or commitments that could
                                  require Unitron to issue, sell or otherwise
                                  cause to become outstanding any additional
                                  capital stock or that relate in any way to
                                  Unitron capital stock. Unitron has delivered
                                  to Sabratek true and complete copies of the
                                  Unitron Options and the equity appreciation
                                  and other equity linked rights of



                                       39
<PAGE>   44

                                  Unitron listed on the disclosure schedule
                                  corresponding to this Section (which list
                                  includes the number of shares subject thereto
                                  and the exercise price thereof and indicates
                                  whether such option is an incentive stock
                                  option qualified under the Code).

                            (iii)      No shares of Unitron capital stock have
                                  been issued in violation of any preemptive
                                  rights or anti-dilution right, and no shares
                                  of Unitron capital stock have been issued in
                                  violation in any material respect of any
                                  federal or state securities laws.

                        (f)       Corporate Records. Unitron has delivered to
                             Sabratek true and complete copies of Unitron's
                             Amended and Restated Articles of Incorporation and
                             Bylaws as in effect on the Effective Date. The
                             minute books of Unitron, which have been made
                             available to Sabratek, contain the minutes of all
                             meetings of, and consents to all actions taken
                             without meetings by, the Unitron Board (and any
                             committee thereof) and the shareholders of Unitron
                             since the formation of Unitron.

                        (g)       Financial Statements. Unitron has furnished
                             to Sabratek its December 31, 1997 and November 30,
                             1998 financial statements, which financial
                             statements are unaudited (collectively, the
                             "Financial Statements"). The Financial Statements
                             accurately reflect the books and accounts of
                             Unitron and fairly present the financial position
                             of Unitron as of the dates given and the results of
                             operations of Unitron for the periods indicated.

                        (h)       Undisclosed Liabilities. Except as set forth
                             on the November 30, 1998 balance sheet included in
                             the Financial Statements (the "Balance Sheet"), or
                             as set forth on the disclosure schedule
                             corresponding to this Section, Unitron has no
                             liabilities or obligations of any type, nature or
                             description, known or unknown, asserted or
                             unasserted, direct or indirect, absolute or
                             contingent, other than those which have been
                             incurred in the ordinary course of business since
                             the date of the Balance Sheet (none of which
                             ordinary course liabilities or obligations is a
                             liability resulting from breach of contract, breach
                             of warranty (other than an ordinary course
                             warranty), fraud or other tort, infringement or
                             lawsuit).



                                       40
<PAGE>   45

                        (i)       Absence of Certain Changes. Except as set
                             forth on the disclosure schedule corresponding to
                             this Section, since July 30, 1998 (the "Balance
                             Sheet Date") there has not been: (i) any
                             transaction not in the ordinary course of Unitron's
                             business; (ii) any material adverse change in the
                             assets, liabilities (whether absolute, accrued,
                             contingent or otherwise), business or prospects of
                             Unitron taken as a whole; (iii) any mortgage,
                             pledge or subjection to lien, charge, or
                             encumbrance of any kind, except liens for taxes not
                             due, of any of Unitron's properties or assets; (iv)
                             any amendment, modification or termination of any
                             material lease, contract or agreement to which
                             Unitron is a party; (v) any increase in, or
                             commitment to increase, the compensation payable or
                             to become payable to any officer, director,
                             employee or agent of Unitron, or any bonus payment
                             or similar arrangement made to or with any of such
                             officers, directors, employees or agents, other
                             than routine increases made in the ordinary course
                             of business; (vi) any incurrence or assumption of
                             any liability, except for liabilities incurred in
                             the ordinary course of business and consistent with
                             past practices; (vii) any alteration in the manner
                             of keeping the books, accounts or records of
                             Unitron, or in the accounting practices therein
                             reflected; or (viii) any sale or transfer of any
                             Unitron's assets or any cancellation of any debts
                             or claims other than in the ordinary course of
                             business.

                        (j)       Related Party Transactions. Except as
                             otherwise set forth on the disclosure schedule
                             corresponding to this Section, since July 1, 1997,
                             Unitron has not been a party to any material
                             transaction (other than employee compensation and
                             other ordinary incidents of employment) with a
                             person who was, at the time, a Related Party, and
                             Unitron currently has no contractual obligations to
                             any Related Party. "Related Party" means any
                             present or former officer or director of Unitron,
                             any present or former holder of 5% or more of the
                             issued and outstanding common stock of Unitron, or
                             any other person who, to the knowledge of Unitron,
                             at the time relevant to the determination, is or
                             was a spouse, child, parent or sibling of any of
                             the aforementioned persons or is or was a trust or
                             similar entity for the benefit of any of the
                             foregoing persons. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             no material property or interest in any material
                             property which is used in the operations of Unitron
                             or any Intellectual Property of Unitron is owned by
                             or leased or licensed by or to any Related Party.

                                       41
<PAGE>   46

                        (k)       Litigation. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             there are no material actions, suits, claims,
                             audits, investigations, or proceedings (judicial,
                             administrative or arbitration) pending or, to the
                             knowledge of Unitron, threatened, or any facts
                             known to Unitron which could given rise to any
                             material actions, suits, claims, investigations or
                             proceedings, against Unitron, whether at law or in
                             equity and whether civil or criminal in nature,
                             before or by any federal, state, municipal or other
                             court, arbitrator, governmental department,
                             commission, agency or instrumentality, domestic or
                             foreign. Nor are there any judgments, decrees or
                             orders of any such court, arbitrator, governmental
                             department, commission, agency or instrumentality
                             outstanding against Unitron (i) which have, or
                             could reasonably be expected to have, a material
                             adverse effect on the assets, liabilities or
                             prospects of the business of Unitron, or (ii) which
                             seek specifically to prohibit, restrict or delay
                             consummation of the transactions contemplated
                             hereby or fulfillment of any of the conditions of
                             this Agreement.

                        (l)       Compliance with Laws. Unitron, its property
                             and assets, and Unitron's use of the real property
                             on which its business is currently conducted are in
                             compliance in all material respects with all
                             applicable statutes, laws, ordinances, rules,
                             regulations, subdivision and plat restrictions,
                             requirements and orders of governments and
                             governmental bodies (federal, state, local or
                             foreign), and Unitron has received no notice
                             asserting any non-compliance with any of the
                             foregoing. Unitron has complied in all material
                             respects with all administrative and judicial
                             judgments, orders or decrees (federal, state, local
                             or foreign) to which it is currently subject.

                        (m)       Permits and Other Regulatory Matters. The
                             disclosure schedule corresponding to this Section
                             sets forth all material U.S. (and to the knowledge
                             of Unitron, foreign) regulatory permits, licenses
                             and other governmental authorizations and approvals
                             necessary to the ownership or operation of
                             Unitron's properties and the conduct of Unitron's
                             business as the business is currently operated
                             (collectively, "Permits"), all of which that are
                             material and significant have been duly obtained
                             and are in full force and effect. Unitron has made
                             available to Sabratek true and complete copies of
                             all such Permits. To the knowledge of Unitron,
                             Unitron is in compliance in all material respects
                             with the terms and



                                       42
<PAGE>   47

                             conditions of such Permits, and Unitron has
                             received no notice asserting any non-compliance
                             with any of the foregoing. There are no proceedings
                             pending or, to the knowledge of Unitron, threatened
                             seeking to revoke, cancel or suspend, or to
                             materially adversely modify, any Permits.

                        (n)       Taxes. Unitron has delivered to Sabratek
                             copies of all original and amended federal, state,
                             local and foreign income tax returns and
                             information returns filed by Unitron for the three
                             fiscal years ended December 31, 1997, 1996 and
                             1995. Except as specifically set forth in the
                             Financial Statements or on the disclosure schedule
                             corresponding to this Section: (i) Unitron has duly
                             and timely filed or caused to be filed all tax
                             returns and information returns required to be
                             filed by it or for which it may be held
                             responsible; (ii) all such tax returns are true and
                             accurate in all material respects; (iii) Unitron
                             has paid all taxes due and payable and any
                             deficiencies or assessment notices which have been
                             received by it; (iv) no income, information,
                             business or occupation, or franchise tax returns of
                             Unitron have been audited by the taxing
                             authorities; (v) there are no agreements, waivers
                             or other arrangements providing for an extension of
                             time with respect to the filing of any tax returns
                             of Unitron or the payment by, or the assessment
                             against, Unitron of any taxes, assessments or other
                             governmental charges, duties, penalties, interest
                             or fines (such governmental charges, duties,
                             penalties, interest and fines being collectively
                             referred to as "Other Charges"); and (vi) there are
                             no suits, actions, claims, investigations,
                             inquiries or other proceedings pending or to the
                             knowledge of Unitron threatened against Unitron in
                             respect of taxes, assessments or Other Charges, or
                             any matters under discussion with any governmental
                             authority relating to taxes, assessments or Other
                             Charges, or any claims or additional taxes,
                             assessments or Other Charges asserted by any such
                             authority. Unitron is not obligated under any
                             severance contract or other agreement to make any
                             payments that will be non-deductible under Section
                             280G of the Code or any corresponding provision of
                             applicable state, local or foreign income tax law.

                        (o)       Contracts and Leases. All manufacturing,
                             marketing, distribution, sales, service, license,
                             provider, consulting, employment and severance
                             agreements to which Unitron is a party, all
                             confidentiality or non-competition agreements to
                             which Unitron is a party either for the benefit of
                             Unitron or for the benefit of a



                                       43
<PAGE>   48

                          third party, all contracts with any Related Party
                          (or any affiliate of a Related Party), all
                          agreements related to the Unitron Intellectual
                          Property, and all material real and personal
                          property leases and other material contracts,
                          agreements, licenses, franchises, commitments and
                          other similar agreements to which Unitron is a
                          party or by which any of its assets are bound
                          (collectively, the "Contracts") are set forth on
                          the disclosure schedule corresponding to this
                          Section. Unitron has delivered or made available to
                          Sabratek a correct and complete copy of (or a
                          written description of the significant terms of)
                          each of the Contracts, as amended to date. Except
                          as otherwise set forth on the disclosure schedule
                          corresponding to this Section:

                          (i)       The Contracts are valid and binding
                                obligations of the parties thereto and are in
                                full force and effect, enforceable in
                                accordance with their respective terms (except
                                for any provision of any such contract which
                                is not material);

                          (ii)      Unitron has performed all material
                                obligations required to be performed by it
                                under the Contracts on or prior to the
                                Effective Date;

                          (iii)     neither Unitron nor, to the knowledge of
                                Unitron, any other party to any Contract is in
                                default thereunder (as to payments due or
                                otherwise) nor has any event occurred which,
                                with notice or the passage of time or both,
                                could constitute a default thereunder;

                          (iv)      Unitron has not released or waived any
                                material right under any Contract.

                     (p)        Intellectual Property.

                          (i)       The disclosure schedule corresponding to
                                this Section contains a complete and accurate
                                list of all patented and registered
                                Intellectual Property (as hereafter defined)
                                used by Unitron and all pending patent
                                applications and applications for the
                                registration of other Intellectual Property
                                owned by Unitron, as well as (A) all trade
                                names and all unregistered trademarks owned by
                                Unitron; (B) all material computer software
                                owned or used by Unitron other



                                       44
<PAGE>   49

                                  than commercially available software with a
                                  license fee of less than $1,000; and (C) all
                                  licenses granted by Unitron to any third
                                  party, and all licenses granted by any third
                                  party to Unitron, with respect to Intellectual
                                  Property. Unitron has delivered or made
                                  available to Sabratek true and complete copies
                                  of all documents embodying any licenses of
                                  Intellectual Property to which Unitron is a
                                  party, either as licensee or licensor.

                            (ii)       Except as set forth on the disclosure
                                  schedule corresponding to this Section: (A)
                                  Unitron owns and has good and marketable title
                                  to, or has a valid and enforceable written
                                  license to use, all Intellectual Property used
                                  in its business; (B) no proceedings are
                                  pending or, to the knowledge of Unitron,
                                  threatened against Unitron by any third party
                                  contesting the validity, enforceability, use
                                  or ownership of any Intellectual Property
                                  owned or used by Unitron in its operations;
                                  (C) no proceedings are pending or, to the
                                  knowledge of Unitron, threatened against
                                  Unitron by any third party alleging any
                                  infringement or misappropriation by Unitron of
                                  any Intellectual Property rights of any third
                                  party; and (D) Unitron is not aware of any
                                  infringement or misappropriation by any third
                                  party of any Intellectual Property rights of
                                  Unitron.

                            (iii)      For purposes of this Agreement,
                                  "Intellectual Property" means: (A) all
                                  inventions (whether or not patentable and
                                  whether or not reduced to practice), all
                                  improvements thereto and all patents, patent
                                  applications and patent disclosures, together
                                  with all reissues, continuations,
                                  continuations-in-art, revisions, extensions
                                  and reexaminations thereof; (B) all
                                  trademarks, service marks, trade dress, logos,
                                  Internet domain names, trade names and
                                  corporate names, and all translations,
                                  adaptations, derivations and combinations
                                  thereof and including all goodwill associated
                                  therewith, and all applications, registrations
                                  and renewals in connection therewith; (C) all
                                  copyrights and copyrightable works and
                                  registrations, applications and renewals in
                                  connection therewith; (D) all trade secrets
                                  and confidential information (including ideas,
                                  research and development, technical data,
                                  know-how, formulae, compositions,
                                  manufacturing and



                                       45
<PAGE>   50

                                  production processes and techniques, designs,
                                  drawings, specifications, financial and
                                  accounting data, customer and supplier lists,
                                  pricing and costs information and business
                                  marketing plans and proposals; and (E)
                                  computer software (including operating
                                  software, data, databases and documentation);
                                  provided that Intellectual Property shall not
                                  include any third party off-the-shelf
                                  software.

                        (q)       Title to Assets. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             all of material tangible assets and properties of
                             Unitron are located at Unitron's principal place of
                             business in Clearwater, Florida. Except as
                             otherwise disclosed on the disclosure schedule
                             corresponding to this Section, Unitron owns and has
                             good and marketable title to all of its material
                             properties and assets, free and clear of all liens,
                             claims, encumbrances, equities, security interests,
                             charges and restrictions, except for liens, if any,
                             for taxes not due and for any liens and the like in
                             favor of Sabratek. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             no currently effective financing statement under
                             the Uniform Commercial Code with respect to any of
                             the properties and assets of Unitron has been filed
                             in any jurisdiction, and neither Unitron, nor
                             anyone on its behalf, has signed any financing
                             statement or security agreement authorizing anyone
                             to file any financing statement, lien or other
                             encumbrance against any assets or properties of
                             Unitron.

                        (r)       Insurance. The disclosure schedule
                             corresponding to this Section lists all material
                             insurance policies maintained by Unitron, each of
                             which is in full force and effect and enforceable
                             in accordance with its terms.

                        (s)       Labor and Employment.

                             (i)       Since January 1, 1994, Unitron has not
                                  experienced any material interference with or
                                  impairment of the business of Unitron by
                                  labor. Unitron is not experiencing union
                                  organization efforts or negotiations, or
                                  requests for negotiations, for any
                                  representation or any labor contract relating
                                  to the employees of Unitron. There are no
                                  severance obligations of Unitron other than as
                                  set forth on the disclosure schedule
                                  corresponding to this Section.



                                       46
<PAGE>   51

                            (ii)       Except as set forth on the disclosure
                                  schedule corresponding to this Section,
                                  Unitron has no: (A) contracts with labor
                                  organizations or other collective bargaining
                                  agreements; (B) contracts with any of its
                                  officers, directors or other employees; (C)
                                  contracts with independent contractors or
                                  consultants; (D) "employee benefit plans" as
                                  defined in Section 3(3) of the Employee
                                  Retirement Income Security Act of 1974, as
                                  amended ("ERISA"); (E) "employee welfare
                                  benefit plans" as defined in Section 3(1) of
                                  ERISA that provide medical, health, life
                                  insurance or other welfare-type benefits for
                                  current or future retirees or former employees
                                  of Unitron or their spouses or dependents
                                  (other than in accordance with Part 6 of
                                  Subtitle B of Title I of ERISA and Code
                                  Section 4980B ("COBRA"); (F) other profit
                                  sharing, deferred compensation, bonus, stock
                                  option, stock purchase, welfare, vacation,
                                  holiday, sick pay, or other plans or
                                  arrangements for the benefit of employees
                                  maintained or contributed to by Unitron; (G)
                                  employee regulations or handbooks which relate
                                  in any way to the employees of Unitron; or (H)
                                  former employees of Unitron or their spouses
                                  or dependents currently receiving or entitled
                                  to receive medical, life insurance or other
                                  welfare-type benefits pursuant to COBRA.

                            (iii)      Unitron has complied in all material
                                  respects with all applicable laws, rules and
                                  regulations relating to the employment of
                                  labor, including those relating to
                                  nondiscrimination, wages, hours, collective
                                  bargaining and the payment and withholding of
                                  taxes and other sums as required by
                                  appropriate governmental authorities. Unitron
                                  has complied in all material respects with all
                                  applicable laws, rules and regulations
                                  relating to employee benefits, including
                                  ERISA, and with the requirements of COBRA.
                                  Except as set forth on the disclosure schedule
                                  corresponding to this Section, no unfair labor
                                  practice complaint is pending against Unitron
                                  before the National Labor Relations Board or
                                  any state or local agency, nor has any charge
                                  of discrimination been filed against Unitron
                                  with the Equal Employment Opportunity
                                  Commission or any similar state or local
                                  agency at any time during the three-year
                                  period preceding the Effective Date.


                                                        47

<PAGE>   52




                             (iv)      A true, complete and correct list as of
                                  the Effective Date of all employees and
                                  officers of Unitron and their compensation is
                                  set forth on the disclosure schedule
                                  corresponding to this Section.

                        (t)       Environment, Health and Safety. Except as
                             otherwise set forth on the disclosure schedule
                             corresponding to this Section, Unitron has complied
                             in all material respects with, and is in compliance
                             in all material respects with, any and all
                             Environmental Laws (as hereafter defined), and no
                             claim, action, suit, demand, proceeding (including
                             administrative proceeding), or notice of violation
                             has been filed or commenced against Unitron
                             alleging any failure to comply with any
                             Environmental Laws or alleging any actual or
                             potential liability thereunder. In addition, and
                             without limiting the generality of the foregoing,
                             except as set forth on the disclosure schedule
                             corresponding to this Section and except that this
                             representation and warranty is qualified by
                             materiality:

                             (i)       There are no facts, events,
                                  circumstances, activities, practices,
                                  incidents, actions, plans or conditions
                                  related to past or present operations
                                  conducted by Unitron on or off the properties,
                                  facilities or premises on which it has
                                  conducted or operated business that could form
                                  the basis for any claim, action, demand, suit,
                                  proceeding (including administrative
                                  proceeding), hearing, notice of violation or
                                  liability under the Comprehensive
                                  Environmental Response, Compensation and
                                  Liability Act of 1980, the Resource
                                  Conservation and Recovery Act of 1976, the
                                  Federal Water Pollution Control Act of 1974,
                                  the Toxic Substances Control Act of 1976, the
                                  Refuse Act of 1989, the Emergency Planning and
                                  Community Right-to-Know Act of 1986, each as
                                  amended, or any other law (or rule or
                                  regulation thereunder) of any federal, state,
                                  local or foreign government (or agency
                                  thereof) (including common law), concerning
                                  release or threatened release of any Hazardous
                                  Substance (as hereafter defined), pollution,
                                  protection of worker health and safety or
                                  protection of the environment (collectively,
                                  "Environmental Laws").


                             (ii)      Unitron has not generated, treated,
                                  stored, handled, transported or disposed of
                                  any substance, arranged for the


                                       48

<PAGE>   53




                                  disposal of any substance or owned or operated
                                  any property or facility in any manner which
                                  could form the basis for any present or future
                                  claim, suit, hearing, proceeding (including
                                  administrative proceeding), demand or action
                                  (under the common law or pursuant to any
                                  statute) seeking cleanup of or compensation
                                  for damage to any site, location or body of
                                  water (surface or subsurface) or compensation
                                  for illness or personal injury.

                           (iii)       Unitron has not (A) taken any action or
                                  failed to act in any manner that could form
                                  the basis for any claim or liability under the
                                  Occupational Safety and Health Act, as
                                  amended, or any other law (or rule or
                                  regulation thereunder) of any federal, state,
                                  local or foreign government (or agency
                                  thereof) (including common law) concerning
                                  worker health and safety or (B) exposed any
                                  employee to any substance or condition which
                                  could form the basis for any present or future
                                  claim, suit, hearing, proceeding (including
                                  administrative proceeding), demand or action
                                  (under the common law or pursuant to statute)
                                  seeking compensation for property damage or
                                  illness or personal injury.

                           (iv)        Unitron has obtained and has complied in
                                  all material respects with, and is in
                                  compliance in all material respects with, all
                                  the terms and conditions of all permits,
                                  licenses and other authorizations which are
                                  required under, and has complied in all
                                  material respects with all other limitations,
                                  restrictions, conditions, standards,
                                  prohibitions, requirements, obligations,
                                  schedules and timetables which are contained
                                  in, all Environmental Laws, including rules,
                                  codes, plans, orders, decrees, judgments,
                                  injunctions, and regulations thereunder,
                                  including laws relating to emissions,
                                  discharges, releases or threatened releases of
                                  pollutants, contaminants, chemical or
                                  industrial, hazardous or toxic materials or
                                  wastes into ambient air, surface water, ground
                                  water or lands or otherwise relating to the
                                  manufacture, processing, distribution, use,
                                  treatment, storage, disposal, transport or
                                  handling of pollutants, contaminants, chemical
                                  or industrial, hazardous or toxic materials or
                                  wastes.



                                       49

<PAGE>   54




                           (v)         No real property owned, operated or used
                                  by Unitron contains any underground storage
                                  tanks, materials or equipment containing
                                  asbestos or polychlorinated biphenyls, or
                                  landfills, surface impoundments or waste
                                  disposal areas.

                           (vi)        Unitron has not, either expressly or by
                                  operation of law, assumed or undertaken any
                                  liability, including, without limitation, any
                                  obligation for corrective or remedial action,
                                  of any other person or entity with respect to
                                  any Environmental Laws.

                           (vii)       On and prior to the Effective Date,
                                  Unitron has not buried, stored, spilled,
                                  leaked, discharged, emitted, released, placed
                                  or located any Hazardous Substance on any real
                                  property owned, operated or used by Unitron.
                                  As used herein, "Hazardous Substance" means
                                  any hazardous or toxic substance, material or
                                  waste which is regulated by any local
                                  governmental authority, the State of Florida
                                  or the United States Government. The term
                                  "Hazardous Substance" includes, without
                                  limitation: (A) any material or substance
                                  which is listed or defined as a "hazardous
                                  waste," "extremely hazardous waste,"
                                  "restricted hazardous waste," "hazardous
                                  substance" or "toxic substance" under any
                                  municipal, state or federal law, code or other
                                  regulation; (B) petroleum; (C) asbestos; (D)
                                  polychlorinated biphenyl; (E) any material or
                                  substance which is designated as a "hazardous
                                  substance" pursuant to Section 311 of the
                                  Federal Water Pollution Control Act, as
                                  amended; (F) any material or substance which
                                  is defined as "hazardous waste" pursuant to
                                  Section 1004 of the Federal Resource
                                  Conservation and Recovery Act, as amended; (G)
                                  any material or substance which is defined as
                                  a "hazardous substance" pursuant to Section
                                  101 of the Comprehensive Environmental
                                  Response, Compensation and Liability Act, as
                                  amended; (H) any material or substance which
                                  is defined as a toxic substance in the Toxic
                                  Substances Control Act, as amended; or (I) any
                                  substance which contaminates soil or ground
                                  water and causes degradation of the soil
                                  and/or water to the extent that remediation
                                  efforts are needed to restore the soil or
                                  water to its natural state.


                                       50

<PAGE>   55





                        (u)       Brokers. Unitron has not incurred any
                             obligation for any finder's, broker's or agent's
                             fee in connection with the transactions
                             contemplated by this Agreement.

                        (v)       Continuity of Business Enterprise. Unitron
                             operates at least one significant historic business
                             line, or owns at least a significant portion of its
                             historic business assets, in each case within the
                             meaning of Treasury Regulations Section 1.368-1(d).

                        (w)       Disclaimer of Other Representations and
                             Warranties. EXCEPT AS EXPRESSLY SET FORTH IN THIS
                             AGREEMENT, UNITRON MAKES NO REPRESENTATION OR
                             WARRANTY, EXPRESS OR IMPLIED, AT LAW OR IN EQUITY,
                             IN RESPECT TO UNITRON OR ANY OF ITS ASSETS,
                             LIABILITIES OR OPERATIONS, INCLUDING WITHOUT
                             LIMITATION WITH RESPECT TO MERCHANTABILITY OR
                             FITNESS FOR ANY PARTICULAR PURPOSE, AND ANY SUCH
                             WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED.

                   6.3       Representations and Warranties of Sabratek.
                        Sabratek hereby represents and warrants to Unitron and
                        the Unitron Shareholders that the following statements
                        are true and complete as of the Effective Date:

                        (a)       Organization and Existence of Sabratek.
                             Sabratek is duly organized and validly existing
                             under the laws of the State of Delaware, with all
                             requisite power and authority to own all of its
                             properties and assets and to carry on its business
                             as it is now being conducted. Sabratek is duly
                             qualified to do business and is in good standing in
                             all jurisdictions where the nature of its business
                             makes such qualification necessary.

                        (b)       Execution, Delivery and Validity. Sabratek has
                             full right, power and authority to make, execute,
                             deliver, perform and consummate this Agreement and
                             the other documents and instruments required or
                             contemplated by this Agreement. As of the Closing,
                             the execution, delivery and performance of this
                             Agreement and all other agreements and instruments
                             contemplated


                                       51

<PAGE>   56




                             hereby to which Sabratek is a party will have been
                             duly authorized and approved by the Board of
                             Directors of Sabratek. This Agreement and all other
                             agreements and instruments contemplated hereby to
                             which Sabratek is a party have been duly and
                             validly executed and delivered by Sabratek, and
                             each constitutes the legal, valid and binding
                             obligations of Sabratek, enforceable against
                             Sabratek in accordance with its terms.

                        (c)       Non-Contravention. The execution, delivery
                             and performance of this Agreement and the
                             consummation of the transactions contemplated
                             hereby or compliance with or fulfillment of the
                             terms and provisions hereof or of any other
                             agreement or instrument contemplated hereby, do not
                             and will not: (i) conflict with or result in a
                             breach of any of the provisions of the Certificate
                             of Incorporation or By-Laws of Sabratek; (ii)
                             contravene any law, rule or regulation or any
                             order, writ, award, judgment, decree or other
                             determination which affects or binds Sabratek or
                             any of its properties; or (iii) conflict with,
                             result in a breach of, constitute a default under,
                             or give rise to a right of acceleration,
                             termination or the imposition of penalties under
                             any material contract, deed of trust, mortgage,
                             trust, lease, governmental or other license, permit
                             or other authorization, contract, agreement, note
                             or any other agreement, instrument or restriction
                             to which Sabratek is a party or by which any of its
                             properties may be affected or bound.

                        (d)       Consents. Except as set forth on the
                             disclosure schedule corresponding to this Section,
                             no authorization, consent, approval, permit or
                             license of, or filing or registration with, any
                             governmental or public body or authority, any
                             lender or lessor or any other person is required to
                             authorize, or is required in connection with, the
                             execution, delivery and performance of this
                             Agreement or the agreements contemplated hereby by
                             Sabratek.

                        (e)       SEC Reports and Financial Statements.

                             (i)       Sabratek has filed with the SEC all
                                  forms, reports, schedules, statements and
                                  other documents required to be filed by it
                                  since December 31, 1997 under the Exchange Act
                                  and the Securities Act (as such documents have
                                  been amended since the time of their filing,
                                  collectively, the "Sabratek SEC Documents").
                                  As of their respective dates or, if amended,
                                  as of the date of the last such amendment, the
                                  Sabratek SEC Documents, including, without
                                  limitation, any financial statements and
                                  schedules included


                                       52

<PAGE>   57

                                 therein (i) did not contain any untrue
                                 statement of a material fact or omit to state
                                 a material fact required to be stated therein
                                 or necessary in order to make the statements
                                 therein, in light of the circumstances under
                                 which they were made, not misleading and (ii)
                                 complied in all material respects with the
                                 applicable requirements of the Exchange Act
                                 and the Securities Act, as the case may be,
                                 and the applicable rules and regulations of
                                 the SEC thereunder.

                            (ii)       Each of the financial statements included
                                 in the Sabratek SEC Documents complies in all
                                 material respects with applicable accounting
                                 requirements and with the published rules and
                                 regulations of the SEC with respect thereto,
                                 has been prepared in accordance with GAAP
                                 applied on a consistent basis during the
                                 periods involved (except as may be indicated
                                 in the notes thereto) and fairly presents in
                                 all material respects the consolidated
                                 financial position and the consolidated
                                 results of operations and cash flows (and
                                 changes in financial position, if any) of
                                 Sabratek and its consolidated subsidiaries as
                                 at the dates thereof or for the periods
                                 presented therein (subject, in the case of
                                 unaudited interim financial statements, to
                                 normal year end adjustments and lack of
                                 footnote disclosures).

                       (f)            Absence of Certain Changes. Except as
                                 disclosed in the Sabratek SEC Documents, since
                                 January 1, 1998, Sabratek and its subsidiaries
                                 have conducted their respective businesses and
                                 operations in the ordinary course of business
                                 consistent with past practice. Except as
                                 disclosed in the Sabratek SEC Documents, since
                                 January 1, 1998, there has not occurred: (i)
                                 any events, changes or effects (including the
                                 incurrence of any liabilities of any nature,
                                 whether or not accrued, contingent or
                                 otherwise) having or, which would be
                                 reasonably likely to have, in the aggregate, a
                                 material adverse effect on Sabratek and its
                                 subsidiaries taken as a whole; (ii) any
                                 declaration, setting aside or payment of any
                                 distribution (whether in cash, shares or
                                 property) with respect to the equity interests
                                 of Sabratek or of any of its subsidiaries,
                                 other than any regular quarterly cash
                                 dividends or dividends paid by wholly-owned
                                 subsidiaries; or (iii) any change by Sabratek
                                 or any of its subsidiaries in accounting
                                 principles or methods, except for any such
                                 change required by reason of a change in GAAP.



                                       53

<PAGE>   58

                        (g)       No Undisclosed Liabilities.  Except (i) to the
                             extent disclosed in the Sabratek SEC Documents and
                             (ii) for liabilities and obligations incurred in
                             the ordinary course of business consistent with
                             past practice, since September 30, 1998, neither
                             Sabratek nor any of its subsidiaries has incurred
                             any liabilities or obligations of any nature,
                             whether or not accrued, contingent or otherwise,
                             that have, or would be reasonably likely to have,
                             individually or in the aggregate, a material
                             adverse effect on Sabratek and its subsidiaries
                             taken as a whole.

                        (h)       Litigation. There is no suit, claim, action,
                             proceeding, review or investigation pending or, to
                             the knowledge of Sabratek, threatened against or
                             affecting, Sabratek or any of its subsidiaries
                             which, individually or in the aggregate, is
                             reasonably likely to have a material adverse effect
                             on Sabratek and its subsidiaries taken as a whole,
                             or would, or would be reasonably likely to,
                             materially impair the ability of Sabratek to
                             consummate the transactions contemplated by this
                             Agreement.

                        (i)       Compliance with Law. Sabratek and its
                             subsidiaries have complied with all laws, statutes,
                             regulations, rules, ordinances and judgments,
                             decrees, orders, writs and injunctions, of any
                             court or governmental entity relating to any of the
                             property owned, leased or used by them, or
                             applicable to their business, including, but not
                             limited to, equal employment opportunity,
                             discrimination, occupational safety and health,
                             environmental, insurance, regulatory, antitrust
                             laws, ERISA and laws relating to taxes, except to
                             the extent that any such non-compliance would not
                             have a material adverse effect on Sabratek and its
                             subsidiaries taken as a whole.

                        (j)       No Default. The business of Sabratek and each
                             of its subsidiaries is not being conducted in
                             default or violation of any term, condition or
                             provision of (i) its respective certificate of
                             incorporation or bylaws or similar organizational
                             documents, or (ii) agreements to which Sabratek and
                             its subsidiaries are parties, excluding from the
                             foregoing clause (ii) defaults or violations that
                             would not have a material adverse effect on
                             Sabratek and its subsidiaries taken as a whole and
                             would not, or would not be


                                       54

<PAGE>   59




                         reasonably likely to, materially impair the ability
                         of Sabratek to consummate transactions contemplated
                         by this Agreement.

                     (k)       Certain Securities Matters.

                         (i)        Sabratek represents and warrants that (A)
                               the Call Option and the Unitron Shares it will
                               acquire upon exercise thereof are being
                               acquired by Sabratek for its own account and
                               not with a view to, or for offer or sale in
                               connection with, any distribution thereof, and
                               it is not participating and does not have a
                               participation in any such distribution or the
                               underwriting of any such distribution; (B)
                               Sabratek has sufficient knowledge and
                               experience in financial and business matters
                               and is fully capable of evaluating the merits
                               and risks of purchasing the Call Option and
                               the Unitron Shares; and (C) Sabratek has not
                               been solicited to acquire the Call Option or
                               the Unitron Shares by means of general
                               advertising or general solicitation.

                         (ii)       Sabratek has been furnished with
                               information about and allowed access to
                               Unitron's business, books, records, files, and
                               properties and has had the opportunity to
                               investigate Unitron's business and assets and
                               to ask questions of and receive answers from
                               Unitron sufficient to satisfy Sabratek that
                               Unitron's business is reasonably as described
                               by Unitron.

                         (iii)      Sabratek understands that (A) the Call
                               Option and the Unitron Shares are not
                               registered under any applicable federal or
                               state securities law in reliance upon certain
                               exemptions thereunder, (B) the Call Option and
                               the Unitron Shares may not be sold,
                               transferred or otherwise disposed of without
                               registration under the Securities Act and
                               compliance with applicable state securities
                               laws or the availability of an exemption
                               therefrom; and (C) in the absence of
                               registration under the Securities Act and
                               compliance with applicable state securities
                               laws or an exemption therefrom, the Unitron
                               Shares must be held indefinitely. Sabratek
                               acknowledges that the reliance of the Unitron
                               Shareholders upon such exemption from
                               registration is predicated upon the foregoing
                               representations.


                                                        55

<PAGE>   60
                            (iv)       Sabratek has filed all reports and
                                  statements, together with any amendments
                                  required to be made with respect thereto, that
                                  it was required to file with the SEC, any
                                  state securities authorities, and the Sabratek
                                  Principal Market. As of their respective
                                  dates, each of such reports and documents, as
                                  amended, including the financial statements,
                                  exhibits and schedules thereto, complied in
                                  all material respects with the relevant
                                  statutes, rules and regulations enforced or
                                  promulgated by the regulatory authority with
                                  which they were filed, and did not contain any
                                  untrue statement of a material fact or omit to
                                  state any material fact required to be stated
                                  therein or necessary in order to make the
                                  statements therein, in light of the
                                  circumstances under which they were made, not
                                  misleading.

                        (l)       Brokers. Sabratek has not incurred any
                             obligation for any finder's, broker's or agent's
                             fee in connection with the transactions
                             contemplated by this Agreement.

                        (m)       Market Manipulation. Sabratek has not,
                             directly or indirectly, taken any action designed
                             to cause or to result in, or that has constituted
                             or which might reasonably be expected to
                             constitute, the stabilization or manipulation of
                             the price of Sabratek Stock to facilitate the sale
                             or resale of Sabratek Stock, in any case in
                             violation of any federal or state securities laws.

                        (n)       Acknowledgment of Unitron Disclaimer. SABRATEK
                             ACKNOWLEDGES THAT UNITRON HAS EXPRESSLY DISCLAIMED
                             ANY REPRESENTATIONS AND WARRANTIES NOT SPECIFICALLY
                             SET FORTH IN THIS AGREEMENT AND THAT THE PURCHASE
                             OF THE UNITRON INTELLECTUAL PROPERTY AS
                             CONTEMPLATED BY THIS AGREEMENT IS ON AN "AS-IS,
                             WHERE-IS" BASIS, EXCEPT FOR THE REPRESENTATIONS AND
                             WARRANTIES OF UNITRON EXPRESSLY SET FORTH IN THIS
                             AGREEMENT.


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<PAGE>   61





                                   ARTICLE 7

                     PURCHASE PRICE OFFSET; INDEMNIFICATION

         Prior to the Closing as expressly contemplated by this Agreement, the
Purchase Price may be reduced as provided in Section 7.1 and Article 2. After
the Closing, the parties to this Agreement shall be entitled to indemnification
as provided in Section 7.2. For purposes of this Article 7 and Section 2.1(e),
the parties acknowledge and agree that Damages (as hereinafter defined) incurred
or reasonably expected to be incurred by Unitron shall be Damages incurred by
Sabratek, provided that a Sabratek breach of this Agreement or any other
agreement contemplated hereby that causes Unitron to incur any Damages shall not
be Damages incurred by Unitron for this purpose of this sentence.

                   7.1       Purchase Price Offset:  Determination of Damages
                             Offset.

                        (a)       At any time (or from time to time) after the
                             Effective Date and on or prior to June 1, 1999,
                             Sabratek may give written notice (a "Claim Notice")
                             to the Unitron Representative Shareholders that
                             Sabratek claims (a "Claim") a Damages Offset.
                             Notwithstanding anything in this Agreement to the
                             contrary, the actual Damages Offset made against
                             the Purchase Price shall not exceed $4 million as a
                             result of any such Claims (the "Ceiling Amount").
                             After the Damages Offset made against the Purchase
                             Price equals the Ceiling Amount, Sabratek shall
                             have no right to (i) any further Damages Offset
                             against the Purchase Price or (ii) any post-Closing
                             indemnification as provided in Section 7.2 for the
                             breach of Unitron representations and warranties
                             except as expressly provided in this Agreement. The
                             Claim Notice shall set forth in reasonable detail
                             (i) the nature of the Claim and (ii) if
                             ascertainable, the amount of the Claim (hereinafter
                             referred to as the "Claim Amount"). Upon actual
                             receipt of a Claim Notice, the Unitron
                             Representative Shareholders shall have 5 days to
                             dispute some or all of the Claim (and, if set forth
                             in the Claim Notice, some or all of the Claim
                             Amount) by giving written notice to Sabratek
                             specifying in reasonable detail the basis for the
                             dispute (a "Dispute Notice"). Upon the expiration
                             of such 5 day period, any portion of the Claim
                             (and, if set forth in the Claim Notice, the Claim
                             Amount) not disputed in a Dispute Notice so given
                             shall be deemed approved by the Unitron
                             Representative Shareholders. If, within the 5 day
                             period referred to above, the Unitron
                             Representative Shareholders gives a Dispute Notice
                             to Sabratek, Sabratek and the Unitron
                             Representative Shareholders shall


                                                        57

<PAGE>   62

                             undertake to obtain as promptly as practicable a
                             final resolution of the dispute specified therein.
                             If Sabratek and the Unitron Representative
                             Shareholders are unable to resolve such dispute
                             within 5 days after the delivery to Sabratek of the
                             Dispute Notice, then Sabratek and the Unitron
                             Representative Shareholders shall submit such
                             dispute to arbitration in accordance with Section
                             9.1 of the Agreement. Sabratek and the Unitron
                             Representative Shareholders agree that such
                             arbitration shall be completed and a final
                             arbitration decision rendered within 35 days of the
                             submission of the respective dispute to
                             arbitration, and each of such parties shall take
                             all actions appropriate and necessary to cause such
                             arbitration to be so completed within such 35 day
                             period. The foregoing notwithstanding, with respect
                             to any Claim related to a claim of a third party
                             which is not determinable as contemplated by
                             subsection (c) below, the respective arbitration
                             decision shall relate only to the Damages
                             reasonable expected to be incurred by Sabratek (if
                             any) with respect to such third party claim as
                             contemplated by subsection (c) below.

                        (b)       The Purchase Price otherwise payable to Frasca
                             shall be reduced by an amount equal to one-half of
                             any Damages Offset determined in accordance with
                             this Section and the Purchase Price otherwise
                             payable to the holders of Unitron Shares and
                             Unitron Options other than Frasca shall be reduced
                             on a pro rata basis in accordance with the
                             respective amounts of the Purchase Price such
                             holders would otherwise have received by an amount
                             equal to one-half of any Damages Offset determined
                             in accordance with this Section, and such amount
                             shall be deemed, at the Closing, to be a Damages
                             Offset.

                        (c)       Notwithstanding the foregoing, if any Claim
                             asserted by Sabratek under this Section relates to
                             any claim which is asserted or threatened by a
                             person other than a party to this Agreement or a
                             successor or assign of a party to this Agreement,
                             the amount of which claim is not determinable prior
                             to the Closing, then the Purchase Price shall be
                             reduced by an amount equal the Damages reasonably
                             expected to be incurred by Sabratek (if any) with
                             respect to such third party claim as determined by
                             arbitration (which amount shall be deemed to be a
                             Damages Offset), as contemplated by the last
                             sentence of subsection (a) above (the "Third Party
                             Claim Holdback"). The Third Party Claim Holdback
                             will be deposited with a third party escrow agent
                             mutually


                                       58

<PAGE>   63



                             acceptable to Sabratek and the Unitron
                             Representative Shareholders and will be governed by
                             an escrow agreement mutually acceptable to Sabratek
                             and the Unitron Representative Shareholders (which
                             agreement shall provide for the release of such
                             escrow or any portion thereof upon the joint
                             written direction of Sabratek and the Unitron
                             Representative Shareholders or the written
                             direction of the respective arbitrator), it being
                             understood that such escrow agreement shall be
                             substantially identical to the escrow agreement
                             attached hereto as Exhibit C. After the Closing,
                             when the amount of Damages (if any) incurred by
                             Sabratek from any such third party claim has been
                             finally determined by arbitration: (i) Sabratek
                             shall be entitled to such amount out of the Third
                             Party Claim Holdback to the extent of the Third
                             Party Claim Holdback (together with the pro rata
                             portion of the proceeds of the investment thereof
                             as of such date attributable thereto) and (ii) if
                             at such time, after giving effect to clause (i),
                             the amount of the Third Party Claim Holdback
                             exceeds the aggregate amount of Damages then
                             reasonably expected to be incurred by Sabratek
                             relating to any third party claims then outstanding
                             as determined by the arbitrator, Frasca and the
                             other Unitron Shareholders shall be entitled to
                             such excess (together with the pro rata portion of
                             the proceeds of the investment thereof as of such
                             date attributable thereto) in accordance with the
                             terms of this Agreement; provided that any portion
                             thereof to which Frasca is entitled shall be
                             deposited into the Frasca Closing Escrow, subject
                             to an aggregate ceiling of $1 million less the
                             value of the consideration deposited into the
                             Frasca Closing Escrow at the Closing (and Frasca
                             and Sabratek shall so direct such escrow agent).

                        (d)       "Unitron Representative Shareholder" initially
                             means Frasca, Sponaugle and Overby, who shall serve
                             together in such capacity. The Unitron
                             Representative Shareholder shall act upon the
                             written direction of a majority of the individuals
                             then serving in such capacity. In the event any of
                             such individuals serving as a Unitron
                             Representative Shareholder ceases for any reason to
                             act in such capacity, Chuck Hall shall then replace
                             such individual in such capacity. If Chuck Hall is
                             not willing to serve in the capacity of a Unitron
                             Representative Shareholder or if subsequent to the
                             commencement of the service of Chuck Hall in such
                             capacity, Chuck Hall or any other Unitron
                             Representative Shareholder ceases for any reason to
                             act in such capacity, Dwight Fawcett shall then
                             serve in the capacity of a Unitron Representative
                             Shareholder.


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<PAGE>   64




                             The Unitron Shareholders shall promptly elect such
                             number of Unitron Representative Shareholders such
                             that 3 individuals are serving in such capacity if
                             and after the above succession rules are exhausted.
                             The individuals serving as the Unitron
                             Representative Shareholders shall not be entitled
                             to any remuneration. Upon any change in or
                             succession pursuant to the foregoing, the then
                             acting or successor Unitron Representative
                             Shareholders shall immediately notify Sabratek of
                             such change or succession (including the names of
                             all of the individuals then serving as the Unitron
                             Representative Shareholders). The Unitron
                             Representative Shareholders are authorized to act
                             as contemplated by this Agreement and the exhibits
                             hereto. In acting or refraining from acting
                             (including without limitation in determining
                             whether to dispute any Claim or other matter, in
                             determining what further action, if any, to take
                             with respect to a disputed Claim or other matter
                             and in determining what actions to take or not take
                             in connection with any arbitration or accounting
                             dispute), the Unitron Representative Shareholders
                             shall have complete discretion provided the Unitron
                             Representative Shareholders act in good faith.
                             Without limiting the generality of the foregoing,
                             the Unitron Representative Shareholders may, in
                             good faith employ accountants, attorneys and other
                             representatives or advisors, and undertake the
                             dispute, defense or settlement of any Claim or
                             other matter, at the expense of the Unitron
                             Shareholders on a pro rata basis.

                   7.2.       Indemnification.

                        (a)       Expiration and Survival. From and after the
                             Closing, the parties shall be indemnified as
                             provided in this Section 7.2. The representations
                             and warranties of the Unitron Shareholders set
                             forth in Section 6.1 (collectively, the
                             "Shareholder Representations") shall survive the
                             Closing and continue in full force and effect
                             forever thereafter (subject to any applicable
                             statute of limitations). The representations and
                             warranties of Sabratek set forth in Section 6.3 and
                             in the Sabratek Closing Representation
                             (collectively, the "Sabratek Representations")
                             shall survive the Closing and continue in full
                             force and effect for a period of six months
                             thereafter. The representations and warranties of
                             Unitron set forth in Section 6.2 (collectively, the
                             "Unitron Representations") shall not survive the
                             Closing but shall continue in full force and effect
                             for a period of six months thereafter for the


                                       60

<PAGE>   65



                             purpose of the indemnifications obligations of
                             Frasca as expressly provided in this Agreement,
                             except as otherwise expressly provided in this
                             Agreement.

                       (b)        Obligations of the Parties. From and after the
                             Closing, each of the Unitron Shareholders shall
                             individually indemnify, defend and hold Sabratek
                             and its successors and permitted assigns, and its
                             directors, officers, employees and agents, and the
                             heirs, executors and personal representatives of
                             each of the foregoing (each a "Sabratek Indemnitee"
                             and collectively the "Sabratek Indemnitees"),
                             harmless from and against any claims, obligations,
                             liabilities, losses, expenses or other costs
                             (including, without limitation, reasonable
                             attorneys' fees and expenses) (collectively,
                             "Damages") incurred by any Sabratek Indemnitee and
                             proximately caused by any material inaccuracy in
                             any of the Shareholder Representations given by
                             such Unitron Shareholder or the breach of any
                             covenant or agreement of such Unitron Shareholder
                             contained in this Agreement or, in the case of the
                             Asset Acquisition Alternative, any liability or
                             obligation which is not assumed by Sabratek as
                             provided in Section 3.3 (including any liability or
                             obligation that becomes a liability or obligation
                             of Sabratek (or its designated transferee) by
                             operation of law, bulk sale statute or otherwise).
                             From and after the Closing, Frasca shall
                             individually indemnify, defend and hold the
                             Sabratek Indemnitees harmless (to the extent and
                             only to the extent of amounts available from the
                             Frasca Closing Escrow in accordance with the terms
                             of Exhibit B attached hereto) from and against any
                             Damages incurred by any Sabratek Indemnitee and
                             proximately caused by any material inaccuracy in
                             any of the Unitron Representations or the breach of
                             any covenant or agreement of Unitron contained in
                             this Agreement, subject to the limitations
                             expressly set forth in this Agreement. Nothing in
                             this Agreement shall limit Sabratek from seeking
                             indemnification for Damages from Frasca with
                             respect to a breach of a Unitron Representation as
                             provided above which is: (i) related to any Damages
                             Offset or arising from the breach pursuant to which
                             a Damages Offset was made, except that Sabratek
                             Damages shall not be double counted and the
                             arbitration of any Claim under Section 7.1 shall
                             continue to be final and binding; and (ii) newly
                             discovered by Sabratek after the Closing in that
                             Sabratek through reasonable diligence could not
                             have discovered the existence or the extent of such
                             Damages prior to the Closing. From and after the
                             Closing, Sabratek shall indemnify, defend and



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<PAGE>   66

                             hold each of the Unitron Shareholders and the
                             heirs, executors and personal representatives of
                             each of the Unitron Shareholders (each a "Unitron
                             Shareholder Indemnitee" and collectively the
                             "Unitron Shareholder Indemnitees") harmless from
                             and against any Damages incurred by any of the
                             Unitron Shareholders and proximately caused by any
                             material inaccuracy in any of the representations
                             and warranties of Sabratek contained in Section 6.3
                             or the breach of any covenant or agreement of
                             Sabratek contained in this Agreement. A claim by a
                             Sabratek Indemnitee or a Unitron Shareholder
                             Indemnitee for indemnification under this Article 7
                             shall be ineffective unless such person delivers a
                             written claim for indemnification within the
                             survival period specified in Section 7.2 as
                             applicable to the representation or warranty that
                             is the subject of such claim.

                        (c)       Claim for Indemnification. If a party has
                             reasonable grounds to believe that it may incur or
                             suffer any Damages, such party shall promptly
                             provide written notice (a "Notice of Claim") of the
                             intention of such party to seek indemnification to
                             the potential indemnifying party of the intention
                             of such indemnified party to seek indemnification,
                             the specific basis of the claim for indemnification
                             and the amount for which indemnification is sought
                             (the "Indemnification Amount"), if known. The
                             relevant parties shall thereafter attempt to
                             resolve any disputes with respect to either the
                             right to indemnification or the Indemnification
                             Amount in accordance with the applicable provisions
                             of this Agreement. If any action at law or suit in
                             equity is instituted by a third party with respect
                             to which any party intends to claim any liability
                             or expense as Damages under Section 7.2(a), such
                             party shall promptly notify the indemnifying party
                             in writing of such action or suit.

                        (d)       Limitations on Frasca Indemnification
                             Obligation. Notwithstanding anything to the
                             contrary contained herein, the Sabratek Indemnitees
                             shall only be entitled to indemnification against
                             Frasca pursuant to Section 7.2 with respect to any
                             Unitron Representations once the aggregate amount
                             otherwise so payable to the Sabratek Indemnitees
                             pursuant to or as a result of such Section exceeds
                             a total amount equal to (i) $250,000 less (ii) the
                             amount of the deductible specified in Section
                             2.1(e) incurred by Sabratek prior to the Closing,
                             and such amount shall be a one-time deductible to
                             be borne by Sabratek. Notwithstanding the


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<PAGE>   67




                             foregoing, the time limitations related to
                             indemnification claims, the deductible amount and
                             the other indemnification restrictions specified
                             above in this Section 7.2 shall not apply with
                             respect to any fraudulent or intentional
                             misrepresentation. The Sabratek Indemnitees shall
                             be entitled to satisfy any indemnification
                             obligations of Frasca from the Frasca Closing
                             Escrow to the extent of the amounts available from
                             the Frasca Closing Escrow in accordance with the
                             terms of Exhibit B attached hereto.

                   7.3       Third Party Claims.  The indemnifying party shall
                        have the right to conduct and control, at its expense
                        and through counsel of its own choosing, the defense of
                        any third party claim, action or suit, but the
                        indemnified party may, at its election, participate in
                        the defense of any such claim, action or suit at its
                        sole cost and expense; provided, that if (i) the
                        indemnifying party and the indemnified party mutually
                        agree or (ii) the named parties to such claim, action or
                        suit (including any impleaded parties) include both the
                        indemnifying party and the indemnified party and
                        representation of both parties by the same counsel would
                        be inappropriate due to actual or potential differing
                        interests between them, then the indemnified party may
                        defend, through counsel of its own choosing, such claim,
                        action or suit and (so long as it gives the indemnifying
                        party at least 15 days prior notice of the terms of the
                        proposed settlement thereof) settle such claim, action
                        or suit, and recover from the indemnifying party the
                        amount of such settlement or of any judgment and the
                        costs and expenses of such defense. In the event that
                        the indemnifying party is not diligently conducting the
                        defense of any such third party claim, the indemnified
                        party shall then be entitled to conduct and control, at
                        its expense and through counsel of its own choosing, the
                        defense of such third party claim, but the indemnifying
                        party may, at its election, participate in the defense
                        of any such claim, action or suit at its sole cost and
                        expense. Neither the indemnifying party nor the
                        indemnified party shall compromise or settle any third
                        party claim, action or suit without the prior written
                        consent of the other party, which consent will not be
                        unreasonably withheld or delayed.

                   7.4       Exclusivity. Except to the extent such limitation
                        is prohibited by applicable laws and such prohibition is
                        not waivable, the remedies provided in this Agreement
                        shall be exclusive of any other rights or remedies
                        available to one party against another party with
                        respect to this Agreement. To the maximum extent
                        permitted by applicable laws, each of parties waives the
                        benefit of any such prohibition.


                                       63
<PAGE>   68

                                   ARTICLE 8

                                   TERMINATION

                   8.1       Right to Terminate.

                        (a)       Termination by Agreement. This Agreement may
                             be terminated at any time prior to the Closing upon
                             the mutual written agreement of Sabratek and
                             Unitron.

                        (b)       Termination by Unitron. Unitron shall have the
                             right to terminate this Agreement at any time prior
                             to the Closing upon written notice given to
                             Sabratek upon the occurrence of any one or more of
                             the following events:

                             (i)       The material breach of any of the
                                  representations, warranties, covenants or
                                  agreements of Sabratek contained in this
                                  Agreement and the failure by Sabratek to take
                                  adequate initial steps to remedy such breach
                                  within 30 days after written notice of breach
                                  is given by Unitron to Sabratek and to have
                                  remedied such breach within 60 days after the
                                  delivery of such written notice; or

                             (ii)      An assignment by Sabratek for the benefit
                                  of its creditors or the admission by Sabratek
                                  in writing of its inability to pay its debts
                                  generally as they become due; the entry of an
                                  order, judgment or decree adjudicating
                                  Sabratek bankrupt or insolvent; the entry of
                                  any order for relief with respect to Sabratek
                                  under the Federal Bankruptcy Code; the filing
                                  of a petition or application by Sabratek to
                                  any tribunal for the appointment of a
                                  custodian, trustee, receiver or liquidator of
                                  Sabratek; the commencement by Sabratek of any
                                  proceeding (other than a proceeding for the
                                  voluntary liquidation and dissolution of a
                                  subsidiary) relating to Sabratek under any
                                  bankruptcy, reorganization, arrangement,
                                  insolvency, readjustment of debt, dissolution
                                  or liquidation law of any jurisdiction; or the
                                  filing of any such petition or application, or
                                  the commencement of any such proceeding,
                                  against Sabratek which (a) Sabratek by any act
                                  indicates its approval thereof, consent
                                  thereto or acquiescence therein or (b) is not
                                  dismissed within 60 days; or


                                                        64


<PAGE>   69
                           (iii)       The Sabratek Stock is not listed for
                                  trading on any one of the Nasdaq National
                                  Market, the New York Stock Exchange or the
                                  American Stock Exchange; or

                           (iv)        Sabratek's independent certified public
                                  accounting firm issues any report on annual
                                  audited financial statements for Sabratek
                                  which is qualified with a "going concern"
                                  statement.

                        (c)            Termination by Sabratek. Sabratek shall
                                  have the right to terminate this Agreement at
                                  any time prior to the Closing upon written
                                  notice given to Unitron upon the occurrence of
                                  any one or more of the following events:

                           (i)         The material breach of any of the
                                  covenants of Unitron set forth in this
                                  Agreement, other than any such breach
                                  initiated or caused directly or indirectly by
                                  Sabratek (including through the Sabratek
                                  representative on the Unitron Board), and the
                                  failure by Unitron to take adequate initial
                                  steps to remedy such material breach within 30
                                  days after written notice of breach is given
                                  by Sabratek to Unitron and to have remedied
                                  such breach within 60 days after the delivery
                                  of such written notice; or

                           (ii)   The material breach of any of the
                                  representations, warranties, covenants or
                                  agreements of the Unitron Shareholders
                                  (considered in the aggregate) contained in
                                  this Agreement and the failure by such Unitron
                                  Shareholders to take adequate initial steps to
                                  remedy such material breach within 30 days
                                  after written notice of breach is given by
                                  Sabratek to Unitron (copies of which notice
                                  shall be given simultaneously by Sabratek to
                                  the Unitron Representative Shareholders) and
                                  to have remedied such breach within 60 days
                                  after the delivery of such written notice; or

                           (iii)       Shareholders of Unitron holding 92.5% or
                                  more in interest of the fully diluted equity
                                  of Unitron shall not have become a party to
                                  this Agreement in accordance with the terms of
                                  this Agreement on or prior to February 26,
                                  1999; or


                                       65

<PAGE>   70


                            (iv)       The shareholders of Unitron do not duly
                                  adopt and approve of this Agreement and the
                                  transactions contemplated by this Agreement at
                                  the Unitron Special Meeting (or deliver to
                                  Unitron an equivalent written consent of
                                  Unitron shareholders to Unitron) on or prior
                                  to February 26, 1999; or

                            (v)        More than 5% of the shareholders of
                                  Unitron exercise dissenters rights with
                                  respect to the Asset Acquisition Alternative
                                  contemplated by this Agreement; or

                            (vi)       Frasca revokes his Separation Agreement
                                  in accordance with its terms; or

                            (vii)      The failure of the Sabratek board to
                                  approve this Agreement and the transactions
                                  contemplated hereby, except that this
                                  termination right shall lapse and be of no
                                  force or effect on Tuesday, January 26, 1999
                                  at 5:00 p.m. Central Time if Sabratek has not
                                  prior to such time notified Unitron that its
                                  board of directors has decided not to approve
                                  this Agreement and the transactions
                                  contemplated hereby.

                   8.2       Effect of Termination. Except as expressly provided
                        herein, neither party shall be bound to the other after
                        the expiration or termination of this Agreement.
                        Expiration or termination of this Agreement in
                        accordance with its terms will in no way affect or
                        impair any rights, obligations or liabilities existing,
                        accruing or arising under this Agreement prior to such
                        termination, or any rights, obligations or liabilities
                        accruing or arising under any other agreements between
                        the parties, including, without limitation, any
                        liabilities for actual damages arising out of a material
                        breach of this Agreement, prior to the date of such
                        expiration or termination.

                                   ARTICLE 9

                               GENERAL PROVISIONS

                   9.1       Dispute Resolution.  To the extent feasible, the
                        parties desire to resolve any controversies or claims or
                        issues arising out of or relating to this Agreement
                        through discussions and negotiations between each other.
                        The parties agree to use their best efforts to attempt
                        to resolve any


                                       66



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