DATAMETRICS CORP
8-K, 1999-08-24
COMPUTER PERIPHERAL EQUIPMENT, NEC
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================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                               -------------------
                                    FORM 8-K
                               -------------------

                                 CURRENT REPORT

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


                                 August 2, 1999
           -----------------------------------------------------------
                Date of Report (Date of earliest event reported)


                             DATAMETRICS CORPORATION
           -----------------------------------------------------------
             (Exact name of registrant as specified in its charter)


                                    DELAWARE
           -----------------------------------------------------------
                 (State or other jurisdiction of incorporation)


        0-8567                                                 95-3545701
- ------------------------                                  --------------------
(Commission File Number)                                    (I.R.S. Employer
                                                           Identification No.)


   25B HANOVER ROAD, FLORHAM PARK, NJ                            07932
- ----------------------------------------                      ------------
(Address of principal executive offices)                       (Zip Code)


                                 (973) 377-3900
           -----------------------------------------------------------
               Registrant's telephone number, including area code

                                 Not Applicable
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)


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

<PAGE>


ITEM 5.  OTHER EVENTS.

         On August 2, 1999, Datametrics Corporation ("the Registrant") completed
the sale of an aggregate  $2,300,000  of 12%  Subordinated  Convertible  Secured
Notes (the "Notes") to twenty-one purchasers  ("Purchasers"),  pursuant to a 12%
Subordinated  Convertible Secured Note Subscription Agreement (the "Subscription
Agreement").

         A portion of the  purchase  price for the Notes was the tender  back to
the  Registrant  and  retirement  of  $600,000  of the  Registrant's  10% Senior
Subordinated  Secured  Debentures  and $150,000 of the  Registrant's  10% Bridge
Notes. The remaining  $1,550,000 of the purchase price for the Notes was paid in
cash.

         The Notes accrue interest at a rate of 12% per annum, payable quarterly
in arrears.  The Notes are secured by a  subordinated  lien on the assets of the
Registrant,  pursuant to a security  agreement  between the  Registrant  and the
Purchasers  ("Security   Agreement").   At  any  time  while  the  Notes  remain
outstanding,  the  holders of the Notes are  entitled  to convert the Notes into
shares of the Registrant's Common Stock ("Conversion Shares") at a rate of $1.00
per share, subject to adjustment in certain circumstances. The Notes are subject
to call and automatic conversion by the Registrant, at its option, if its Common
Stock  has  traded at a price  equal to or  greater  than  $2.00 per share for a
period of 20 consecutive  trading days, provided that the Conversion Shares have
either been registered or are otherwise transferable without restriction.

         In  connection  with the sale of the  Notes,  the  Purchasers  received
warrants  ("Warrants")  to purchase up to an aggregate  1,150,000  shares of the
Registrant's Common Stock for an exercise price of $1.10 per share. The Warrants
are exercisable immediately and at any time commencing August 2, 1999 until 5:00
pm on August 2, 2004. The Warrants are subject to call and  cancellation  by the
Registrant  if its Common  Stock has traded at a price equal to or greater  than
$2.00 per share for the 20  consecutive  trading  days  prior to the date of the
call notice, provided that the Warrant Shares have either been registered or are
otherwise  transferable  without  restriction.   The  Warrants  are  subject  to
adjustment in certain circumstances to prevent dilution.

         Under a related  registration  rights agreement  ("Registration  Rights
Agreement")  between the Registrant and each of the  Purchasers,  the Registrant
has  agreed to include  the  Conversion  Shares  and the shares of Common  Stock
underlying the Warrants in an amendment to the Company's  Registration Statement
on Form SB-2 filed on May 28, 1999.

         Proceeds  of the  sale of the  Notes  and  Warrants  are to be used for
working capital.  It is anticipated that any proceeds received by the Registrant
upon the exercise of the Warrants will be used for working capital.






                                      -2 -

<PAGE>


         The above  discussion  is qualified in its entirety by reference to the
Subscription  Agreement,  Notes,  Warrants,  Registration  Rights  Agreement and
Security Agreement,  which are substantially the same as Exhibits 4.1, 4.2, 4.3,
4.4 and 4.5, respectively, and are incorporated herein by this reference.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

                  a.       Financial statements of business acquired.

                           Not Applicable.

                  b.       Pro forma financial information.

                           Not Applicable.

                  c.       Exhibits.

                           The following exhibits are filed with this report:

                           Exhibit No.      Title.
                           -----------      ------

                           4.1    Form of 12% Subordinated  Convertible  Secured
                                  Note Subscription Agreement.

                           4.2    Form of 12% Subordinated  Convertible  Secured
                                  Note

                           4.3    Form of Warrant.

                           4.4    Form of Registration Rights Agreement.

                           4.5    Form of Security Agreement.





                                      -3 -

<PAGE>




                                   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.


                                            DATAMETRICS CORPORATION


                                            By:    /s/ Daniel P. Ginns
                                               ---------------------------------
                                            Daniel P. Ginns
                                            Chairman and Chief Executive Officer


Dated: August 23, 1999



                                      -4 -

<PAGE>



                                  EXHIBIT INDEX


Exhibit No.       Title.
- -----------       ------

4.1    Form of 12% Subordinated Convertible Secured Note Subscription Agreement.

4.2    Form of 12% Subordinated Convertible Secured Note.

4.3    Form of Warrant.

4.4    Form of Registration Rights Agreement.

4.5    Form of Security Agreement.




                                      -5 -




THE SECURITIES  DESCRIBED IN THIS AGREEMENT  HAVE NOT BEEN  REGISTERED  WITH THE
UNITED STATES  SECURITIES  AND EXCHANGE  COMMISSION  (THE  "COMMISSION")  OR THE
SECURITIES  COMMISSION OF ANY STATE PURSUANT TO AN EXEMPTION  FROM  REGISTRATION
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),  AND APPLICABLE  STATE
SECURITIES  LAWS. THIS  SUBSCRIPTION  AGREEMENT SHALL NOT CONSTITUTE AN OFFER TO
SELL NOR A SOLICITATION OF AN OFFER TO BUY THE SECURITIES IN ANY JURISDICTION IN
WHICH SUCH OFFER OR  SOLICITATION  WOULD BE UNLAWFUL.  THE SECURITIES MAY NOT BE
SOLD,  PLEDGED,   TRANSFERRED  OR  ASSIGNED  EXCEPT  PURSUANT  TO  AN  EFFECTIVE
REGISTRATION  STATEMENT  UNDER THE  SECURITIES  ACT AND UNDER  APPLICABLE  STATE
SECURITIES LAWS, OR IN A TRANSACTION WHICH IS EXEMPT FROM REGISTRATION UNDER THE
PROVISIONS  OF THE  SECURITIES  ACT AND UNDER  PROVISIONS  OF  APPLICABLE  STATE
SECURITIES LAWS.

                    12% SUBORDINATED CONVERTIBLE SECURED NOTE
                             SUBSCRIPTION AGREEMENT

                             DATAMETRICS CORPORATION

THIS 12%  SUBORDINATED  CONVERTIBLE  SECURED NOTE  SUBSCRIPTION  AGREEMENT (this
"Agreement")  is executed in reliance upon an exemption under the Securities and
Exchange Commission  ("SEC"),  under the Securities Act of 1933, as amended (the
"Act"). The undersigned hereby subcribes for the Notes hereinafter  described in
the amount set forth on its/his/her signature page.

         This  Agreement  has  been  executed  by  the  undersigned  subscribers
("Subscribers",  and  each  a  "Subscriber")  in  connection  with  the  private
placement of up to $2,500,000 of 12% Subordinated Convertible Secured Notes (the
"Notes") and warrants to purchase up to One Million Two Hundred  Fifty  Thousand
(1,250,000)  shares of Common Stock  ("Warrants")  of DATAMETRICS  CORPORATION ,
with an address at 25B  Hanover  Road,  No.  3305,  Florham  Park,  NJ 07932,  a
corporation  organized  under  the  laws of the  State  of  Delaware,  USA  (the
"Company").  The  terms  of the  Notes  are  set  forth  in the  form of the 12%
Subordinated  Convertible  Secured  Note Due 2000  annexed  hereto as Exhibit A,
which terms include, without limitation,  the Subscribers' right to exchange the
Notes for shares of the Company's Common Stock ("Conversion  Shares"). The Notes
shall be secured by a security  interest in the assets of the Company,  pursuant
to a security agreement between the Company, the Subscribers and the Subscribers
Agent  named  therein  ("Security  Agreement"),  in the form  annexed  hereto as
Exhibit B. The terms of the Warrants are set forth in the form annexed hereto as
Exhibit C. The shares of Common Stock issuable upon the exercise of the Warrants
("Warrant  Shares")  and the  Conversion  Shares are  subject to a  registration
rights agreement  ("Registration  Rights Agreement") between the Company and the
Subscribers,  in the form  annexed  hereto as Exhibit  D. The  Notes,  Warrants,
Security  Agreement and Registration  Rights Agreement are referred to herein as
the  "Purchase  Documents."  The offer  and sale of the  Notes and the  Warrants
(collectively  the  "Securities"),  are being made in reliance upon an exemption
under the Act. The Closing Date shall be determined in accordance with Section 1
hereof.

         SECTION 1.  AGREEMENT TO SUBSCRIBE; PURCHASE PRICE.

         1.1  CLOSING.  The closing  ("Closing")  of the purchase and sale shall
occur on July 15, 1999 (the "Closing  Date").  At the Closing,  the Company will
sell and the  Subscribers  will buy, in reliance  upon the  representations  and
warranties of the Company and each Subscriber contained in this Agreement and in
the  Purchase  Documents,  upon the terms and  conditions  set forth  herein and
therein, for an aggregate purchase





                                      - 1 -

<PAGE>


price of up to Two Million Five Hundred Thousand U.S. Dollars  ($2,500,000,  the
"Purchase Price") in such amounts as are subscribed for pursuant hereto.  All or
a portion of the Purchase  Price in the case of certain  Subscribers  ("Existing
Securityholders")  consists of the surrender and cancellation of the 1996 Senior
Subordinated Secured Debentures of the Company (the "Existing  Debentures") held
by such Existing  Securityholders,  the instruments for which shall be delivered
to the Company at the Closing  together with bond powers duly endorsed in blank.
Except as otherwise agreed, the cash portion of the Purchase Price shall be paid
on the Closing Date by federal funds wire transfer, as follows:

         Lane Altman & Owens LLP
         State Street Bank and Trust Company
         Address: 225 Franklin Street, Boston, MA 02110
         Account Title:  Lane Altman & Owens Clients' Fund Account
         Routing:  ABA # 011000028
         Account No.:  3901-4162
         Attention: Gayle L. Rosenfeld, Vice President        Tel (617) 664-3357
                                                              Fax (617) 654-3991

         SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE SUBSCRIBERS.  Each of
the Subscribers individually  acknowledges,  represents,  warrants and agrees as
follows, to the extent applicable to such Subscriber:

         2.1 ORGANIZATION AND AUTHORIZATION. The Subscriber is duly incorporated
or organized and validly  existing in the state or country of its  incorporation
or  organization  and has all requisite power and authority to subscribe for and
purchase  and hold the  Securities  and to enter  into  this  Agreement  and the
Purchase  Documents.  The  decision  to  subscribe  for the  Securities  and the
execution  and  delivery of this  Agreement  and the  Purchase  Documents by the
Subscriber,  the performance by the Subscriber of its obligations  hereunder and
thereunder,   and  the  consummation  by  the  Subscriber  of  the  transactions
contemplated  hereby and thereby have been duly  authorized and require no other
proceedings on the part of the  Subscriber.  The  undersigned  signatory has all
right,  power and  authority  to execute  and  deliver  this  Agreement  and the
Purchase Documents on behalf of the Subscriber.  This Agreement and the Purchase
Documents have been duly executed and delivered by the Subscriber and,  assuming
the  execution  and  delivery  hereof  and  acceptance  hereof  by the  Company,
constitutes  the  legal,  valid  and  binding  obligations  of  the  Subscriber,
enforceable against the Subscriber in accordance with their terms.

         2.2  EVALUATION  OF  RISKS.  The  Subscriber  has  such  knowledge  and
experience in financial and business  matters as to be capable of evaluating the
merits and risks of, and bearing the economic  risks  entailed by, an investment
in the  Company  and  of  protecting  its  interests  in  connection  with  this
transaction.  The  Subscriber  recognizes  that its  investment  in the  Company
involves  a high  degree of risk and could  result in the  complete  loss of its
investment.  The  Subscriber's  overall  commitment  to the  Company  and  other
investments  which are not readily  marketable  is not  disproportionate  to the
Subscriber's net worth and the Subscriber has no need for immediate liquidity in
the Subscriber's investment in the Company.

         2.3 INDEPENDENT COUNSEL. The Subscriber  acknowledges that it have been
advised to consult with its own attorney  regarding legal matters concerning the
Company and its investment in the Securities and to consult with its tax advisor
regarding the tax consequences of acquiring the Securities.

         2.4  DISCLOSURE   DOCUMENTATION.   To  the  full  satisfaction  of  the
Subscriber,  the  Subscriber  has received and reviewed  copies of the Company's
reports  and  registration  statements  filed  since  October 25, 1998 under the
Securities  Exchange  Act of 1934,  as amended  (the "1934  Act"),  and the Act,
including the



                                      - 2 -


<PAGE>

Company's  10-K for the fiscal  year ended  October  25,  1998,  10-QSBs for the
fiscal quarters ended January 24, 1999 and April 25, 1999, 8-Ks filed on January
7, 1999 and May 17, 1999, and a Registration Statement on Form SB-2 filed on May
28, 1999  (collectively,  the "Reports").  No representations or warranties have
been made to the  Subscriber by the Company or any agent,  employee or affiliate
of the Company which were or are in any way inconsistent  with the Reports,  and
in  entering  into this  transaction  the  Subscriber  is not  relying  upon any
information,  other than that  contained  in the  Reports and the results of the
Subscriber's independent investigation.

         2.5  OPPORTUNITY TO ASK QUESTIONS.  The Subscriber has had a reasonable
opportunity to ask questions of and receive answers from the Company  concerning
the Company and the offering of the Securities,  and all such questions, if any,
have been answered to the full satisfaction of such Subscriber.

         2.6  INVESTMENT  INTENT.  Without  limiting  its  ability to resell the
Securities  pursuant to an effective  registration  statement under the Act, the
Subscriber  acknowledges  and agrees with the Company that it is  acquiring  the
Securities  solely for its own account and not with a view to the  distribution,
assignment or resale to others.  The Subscriber  understands  and agrees that it
may have to bear the economic risk of its  investment in the  Securities  for an
indefinite period of time.

         2.7 NO  ADVERTISEMENTS.  The  Subscriber  is not  subscribing  for  the
Securities as a result of or pursuant to any advertisement,  article,  notice or
other communication  published in any newspaper,  magazine,  or similar media or
broadcast over television or radio, or presented at any seminar or meeting.

         2.8  EXISTING   DEBENTURES.   The  Subscriber,   if  also  an  Existing
Securityholder,  is the legal and  beneficial  owner of the Existing  Debentures
free of all liens and  encumbrances  both on the date hereof and at the Closing.
The  Subscriber  agrees to execute all  documents  and  instruments  required to
terminate all liens and encumbrances on assets of the Company in its favor.

         2.9 DILUTION.  The Subscriber is aware and acknowledges that conversion
of the Notes and  exercise of the  Warrants  could  significantly  increase  the
outstanding  number of shares of Common  Stock and cause  dilution  to  existing
stockholders.

         SECTION 3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  THE COMPANY
ACKNOWLEDGES, REPRESENTS, WARRANTS AND AGREES AS FOLLOWS:

         3.1  ORGANIZATION/QUALIFICATION.  The  Company  is a  corporation  duly
organized and validly existing under the laws of the State of Delaware and is in
good standing under such laws. The Company has all requisite corporate power and
authority to own, lease and operate its  properties and assets,  and to carry on
its business as presently conducted.  The Company is qualified to do business as
a  foreign  corporation  in each  jurisdiction  in which  the  ownership  of its
property or the nature of its business requires such qualification, except where
its  failure to be so  qualified  would not  reasonably  be  expected  to have a
material  adverse  effect on the  condition  (financial  or otherwise) or on the
earnings,  business affairs,  properties,  or assets of the Company (a "Material
Adverse Effect").

         3.2 AUTHORIZATION. The Company has all requisite corporate right, power
and authority to execute and deliver this  Agreement and the Purchase  Documents
and  to  consummate  the  transactions  contemplated  hereby  and  thereby.  All
corporate  action on the part of the Company,  its  directors  and  stockholders
necessary for the  authorization,  execution,  delivery and  performance of this
Agreement and the Purchase Documents by the Company,  the  authorization,  sale,
issuance and delivery of the  Securities and




                                      - 3 -

<PAGE>


the performance of the Company's  obligations  hereunder and thereunder has been
taken.  Upon their  issuance and delivery in accordance  with this Agreement and
the Purchase  Documents,  the Securities will be validly issued,  fully paid and
nonassessable and will be free of any liens or encumbrances;  provided, however,
that the Securities are subject to  restrictions  on transfer under state and/or
federal  securities  laws. The issuance and sale of the Securities will not give
rise to any preemptive right or right of first refusal or right of participation
on behalf of any person.

         3.3 FILING OF  REPORTS.  The Company has  registered  its Common  Stock
pursuant  to Section 12 of the 1934 Act.  The Company is in  compliance,  to the
extent  applicable and material,  with all reporting  obligations under the 1934
Act.  The  Company has made all  filings  required  to be filed  pursuant to all
reporting obligations under either Section 13(a) or 15(d) of the 1934 Act during
the  twelve  (12)  months  immediately  preceding  the  offer  and  sale  of the
Securities  (or for such  shorter  period that the Company has been  required to
file such material).

         3.4 FULL DISCLOSURE None of the Reports contain any untrue statement of
a material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein in light of the circumstances  under
which  they were made,  not  misleading.  There is no fact known to the  Company
(other than general economic  conditions known to the public generally) that has
not been  publicly  disclosed  by the Company or disclosed in writing to each of
the  Subscribers  which (i) could  reasonably  be  expected  to have a  Material
Adverse Effect, or (ii) could reasonably be expected materially and adversely to
affect the ability of the Company to perform  its  obligations  pursuant to this
Agreement.

         3.5  ENFORCEABILITY;  NO  CONFLICT.  This  Agreement  and the  Purchase
Documents  have been duly executed and  delivered by the Company and  constitute
legal,  valid and binding  obligations of the Company  enforceable in accordance
with their terms, subject to laws of general application relating to bankruptcy,
insolvency  and the  relief  of  debtors  and  rules of law  governing  specific
performance,  injunctive relief or other equitable remedies,  and to limitations
of public policy as they may apply to the  indemnification  provisions set forth
in this Agreement and the Purchase Documents. The execution and delivery of this
Agreement  and the  Purchase  Documents  do not,  and  the  consummation  of the
transactions  contemplated  hereby and thereby will not result in any  violation
of,  constitute  a  default  under,  or give  rise to a  right  of  termination,
cancellation  or  acceleration  of any  material  obligation  or to a loss  of a
material  benefit  under,   any  provision  of  the  Company's   Certificate  of
Incorporation, or Bylaws each (as amended), or any material mortgage, indenture,
lease or other agreement or instrument, permit, concession,  franchise, license,
judgment,  order, decree, statute, law, ordinance, rule or regulation applicable
to the  Company,  its  properties  or assets and which (i) would  reasonably  be
expected to have a Material Adverse Effect, or (ii) could reasonably be expected
materially  and  adversely  to affect the  ability of the Company to perform its
obligations pursuant to this Agreement.

         3.6 GOVERNMENTAL CONSENT, ETC. To the Company's knowledge,  no consent,
approval or  authorization  of or  designation,  declaration  or filing with any
governmental authority on the part of the Company is required in connection with
the valid  execution  and  delivery of this  Agreement  (including  all Exhibits
annexed hereto), the consummation of any other transaction  contemplated hereby,
or the offer,  sale or issuance of the Securities,  except as may be required by
applicable securities laws.

         3.7  MATERIAL  CONTRACTS.  Except  as set  forth  in the  Reports,  the
agreements  to which the Company is a party  described  in the Reports are valid
agreements,  in full  force  and  effect,  and the  Company  is not in breach or
default under any of such  agreements  which could (i) reasonably be expected to
have a Material



                                      - 4 -

<PAGE>

Adverse Effect, or (ii) could reasonably be expected materially and adversely to
affect the ability of the Company to perform  its  obligations  pursuant to this
Agreement.

         3.8 LITIGATION. Except as disclosed in the Reports, there is no action,
proceeding or investigation  pending, or to the Company's knowledge  threatened,
against the Company which might result, either individually or in the aggregate,
in any Material Adverse Effect,  nor is the Company a party to or subject to the
provisions of any order,  writ,  injunction,  judgment or decree of any court or
government agency or  instrumentality  which could (i) reasonably be expected to
have a  Material  Adverse  Effect,  or (ii)  could  reasonably  be  expected  to
materially  and  adversely  affect  the  ability of the  Company to perform  its
obligations pursuant to this Agreement.

         3.9  CAPITALIZATION.  The  authorized  capital  stock  of  the  Company
consists of  40,000,000  shares of Common Stock,  $0.01 par value per share,  of
which 19,007,227 are outstanding.  There are 5,000,000 shares of Preferred Stock
authorized and none outstanding. The Company has issued and outstanding Warrants
to  purchase  approximately  5,634,901  shares of Common  Stock.  All issued and
outstanding shares of Common Stock have been duly authorized, validly issued and
fully paid and nonassessable.

         SECTION 4.  SECURITIES ISSUES.

         4.1 NO REGISTRATION,  REVIEW OR APPROVAL.  Each Subscriber acknowledges
and understands that the sale of Securities pursuant to this Agreement:  (i) has
not been reviewed or approved by the SEC or by any state securities  commission,
authority  or  agency,  (ii)  is not  registered  under  the  Act or  under  the
securities or "blue sky" laws,  rules or regulations of any state, and (iii) are
being offered and sold hereunder  pursuant to a private  placement  exemption to
the registration  provisions of the Act pursuant to Section 3(b) or Section 4(2)
of  such  Act,  and a  similar  exemption  to  the  registration  provisions  of
applicable state  securities laws. Each Subscriber  acknowledges and understands
that the Securities,  Conversion  Shares and Warrant Shares may not be resold or
otherwise  transferred unless so registered or subject to an exemption from such
registration.

         4.2  RELIANCE  BY  COMPANY.   The  Subscriber   understands   that  the
information  provided herein,  including  specifically,  but not limited to, the
responses provided in Section 9.2 or 9.3 (as applicable) of this Agreement, will
be relied upon by the Company for the purpose of determining  the eligibility of
the  Subscriber  to purchase  the  Securities  of the  Company.  The  Subscriber
represents  to the  Company  that  his/her/its  representations  and  warranties
contained herein are complete and accurate and may be relied upon by the Company
in determining the availability of an exemption from registration  under federal
and state  securities laws in connection with a private  offering of securities.
The Subscriber agrees to provide, if requested,  any additional information that
may  reasonably be required to determine the  eligibility  of the  Subscriber to
purchase the Securities of the Company.

         4.3 INDEMNIFICATION.  Each of the Subscribers agrees to indemnify,  and
to  hold  harmless  the  Company  and  its  affiliates,   officers,   directors,
controlling persons,  attorneys,  agents and employees, from and against any and
all losses,  damages,  liabilities,  costs and  expenses  (including  reasonable
attorneys'  fees) which the Company  and/or any of them may sustain or incur due
to, arising out of or in connection with the breach or threatened breach by such
Subscriber of any  representation,  warranty or covenant made by such Subscriber
in this  Agreement,  any of the  Purchase  Documents,  or in any other  document
provided by the  Subscriber to the Company in connection  with the  Subscriber's
investment in the Securities,  including,  without  limitation,  transfer of the
Subscriber's Securities in violation of the Act.


                                      - 5 -

<PAGE>

         SECTION 5. Legend.  Until such time as the  Securities  are  registered
under the Act, the certificates  representing the Securities shall be subject to
a legend restricting  transfer under the Act, such legend to be substantially as
follows:

         "THESE SHARES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933
         (THE  "SECURITIES  ACT") OR UNDER  APPLICABLE STATE SECURITIES LAWS AND
         MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED
         UNDER THE SECURITIES ACT AND ANY APPLICABLE  STATE  SECURITIES  LAWS OR
         PURSUANT TO AVAILABLE EXEMPTIONS FROM SUCH REGISTRATION,  PROVIDED THAT
         THE SELLER  DELIVERS TO THE COMPANY AN OPINION OF COUNSEL  SATISFACTORY
         TO THE COMPANY CONFIRMING THE AVAILABILITY OF SUCH EXEMPTION. INVESTORS
         SHOULD BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE  FINANCIAL  RISKS
         OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME."

The certificates  representing these Securities,  and each certificate issued in
transfer thereof,  will also bear any legend required under any applicable state
securities law.

         SECTION  6.  CONDITIONS  TO THE  COMPANY'S  OBLIGATION  TO  SELL.  Each
Subscriber  understands that the Company's  obligation to sell the Securities to
such Subscriber is conditioned upon:

         (i)      The receipt and acceptance by the Company of this Subscription
                  Agreement  and all  Purchase  Documents  duly  executed by the
                  Subscriber;

         (ii)     Delivery by the  Subscriber of the Purchase Price set forth in
                  Schedule  A as  payment  in  full  for  the  purchase  of  the
                  Securities subscribed for by the Purchaser;

         (iii)    All representations and warranties of the Subscriber contained
                  herein shall  remain true and correct as of the Closing  Date;
                  and

         (iv)     The Company shall have obtained all permits and qualifications
                  required   by  any  state  for  the  offer  and  sale  of  the
                  Securities,  or shall  have  the  availability  of  exemptions
                  therefrom.  At the Closing Date,  the sale and issuance of the
                  Securities  shall  be  legally   permitted  by  all  laws  and
                  regulations  to  which  the  Subscriber  and the  Company  are
                  subject.

         SECTION 7.  CONDITIONS  TO  SUBSCRIBER'S  OBLIGATION  TO PURCHASE.  The
Company understands that each Subscriber's obligation to purchase the Securities
is conditioned upon:

         (i)      Acceptance  by the  Company of the  Subscriber's  Subscription
                  Agreement  in the form  hereof  and the due  execution  by the
                  Company of the Exhibits hereto in favor of such Subscriber;

         (ii)     Delivery  by  the  Company  of  the  original   Securities  as
                  described herein;

         (iii)    All  representations  and warranties of the Company  contained
                  herein shall remain true and correct in all material  respects
                  as of the Closing Date; and

         (iv)     The Company shall have obtained all permits and qualifications
                  required by any state for the offer and sale of the Securities
                  or shall have the availability of exemptions therefrom.



                                      - 6 -

<PAGE>

                  At the Closing Date,  the sale and issuance of the  Securities
                  shall be  legally  permitted  by all laws and  regulations  to
                  which the Company and each Subscriber are subject.

         SECTION 8.  MISCELLANEOUS.

         8.1 GOVERNING  LAW/JURISDICTION.  This  Agreement will be construed and
enforced in accordance with and governed by the laws of the State of New Jersey,
except for matters  arising  under the Act,  without  reference to principles of
conflicts of law.  Each of the parties  consents to the  jurisdiction  of the US
District  Court  for the  State of New  Jersey in  connection  with any  dispute
arising under this Agreement and hereby waives,  to the maximum extent permitted
by law, any objection, including any objection based on forum non conveniens, to
the  bringing of any such  proceeding  in such  jurisdiction.  Each party hereby
agrees that if another party to this Agreement  obtains a judgment against it in
such a  proceeding,  the party which  obtained such judgment may enforce same by
summary judgment in the courts of any state or country having  jurisdiction over
the party against whom such judgment was obtained, and each party hereby waives,
to the extent permitted by law, any defenses available to it under local law and
agrees to the  enforcement  of such a  judgment.  Each  party to this  Agreement
irrevocably  consents  to the service of process in any such  proceeding  by the
mailing of copies thereof by registered or certified mail,  postage prepaid,  to
such party at its address set forth  herein.  Nothing  herein  shall  affect the
right of any party to serve process in any other manner permitted by law.

         8.2 CONFIDENTIALITY.  The Company and each of the Subscribers agrees to
keep  confidential  and not to  disclose  to or use for the benefit of any third
party the terms of this Agreement  (including the names of the  Subscribers)  or
any other  information  which at any time is  communicated by the other party as
being  confidential  without  the prior  written  approval  of the other  party;
provided,  however, that this provision shall not apply to information which, at
the time of  disclosure,  is already part of the public domain (except by breach
of this Agreement) and information  which is required to be disclosed by law. If
for  any  reason  the  transactions  contemplated  by  this  Agreement  are  not
consummated,  each of the  parties  hereto  shall  keep  confidential  any  such
information  obtained  from  any  other  party,  including  the  names  of  each
Subscriber  (except  information  publicly  available or in such party's  domain
prior to the date  hereof,  and  except as  required  by court  order) and shall
promptly return to the other parties all schedules, documents, instruments, work
papers  or  other  written   information,   without  retaining  copies  thereof,
previously  furnished  by it as a  result  of this  Agreement  or in  connection
herewith.

         8.3 FACSIMILE/COUNTERPARTS/ENTIRE AGREEMENT. Except as otherwise stated
herein,  in  lieu  of the  original,  a  facsimile  transmission  or copy of the
original shall be as effective and enforceable as the original.  This Agreement,
and in particular  the  Signatures  and Sections 9.2 and 9.3, may be executed in
counterparts  which shall be considered an original  document and which together
shall be considered a complete document. This Agreement,  the Purchase Documents
and the Exhibits  hereto and thereto,  constitute the entire  agreement  between
each Subscriber and the Company with respect to the subject matter hereof.

         8.4  SEVERABILITY.  In the event that any  provision of this  Agreement
becomes or is  declared  by a court of  competent  jurisdiction  to be  illegal,
unenforceable  or void,  this Agreement  shall continue in full force and effect
without said provision; provided that no such severability shall be effective if
it materially changes the economic benefit of this Agreement to any party.

         8.5 LEGAL FEES AND EXPENSES. Each of the parties shall pay its own fees
and  expenses  (including  the fees of any  accountants,  appraisers  or  others
engaged by such party) in connection  with this  Agreement and the  transactions
contemplated hereby.


                                      - 7 -

<PAGE>

         8.6 NOTICES. All notices, demands, requests,  consents,  approvals, and
other  communications  required or permitted  hereunder shall be in writing and,
unless  otherwise  specified  herein,  shall  be  (i)  personally  served,  (ii)
deposited  in the mail,  registered  or  certified,  return  receipt  requested,
postage  prepaid,  (iii) delivered by reputable air courier service with charges
prepaid, or (iv) transmitted by hand delivery, telegram, or facsimile, addressed
as set forth below or to such other  address or  facsimile  number as such party
shall have specified most recently in writing. Any notice or other communication
required or permitted to be given hereunder  shall be deemed  effective (a) upon
hand delivery or delivery by facsimile,  with accurate confirmation generated by
the transmitting  facsimile  machine,  at the address or number designated below
(if delivered on a business day during normal  business  hours where such notice
is to be  received),  or the first  business  day  following  such  delivery (if
delivered  other than on a business day during normal  business hours where such
notice is to be received),  (b) on the second business day following the date of
mailing by reputable courier service, fully prepaid,  addressed to such address,
or upon actual receipt of such mailing,  whichever  shall first occur, or (c) on
the fifth  business day  following  date of mailing by  registered  or certified
mail, return receipt requested,  postage prepaid,  addressed to such address, or
upon actual receipt of such mailing,  whichever shall first occur. The addresses
for such communications shall be:

 (i)      If to the Company: to                 With a copy to:

          Datametrics Corporation               Lane Altman & Owens LLP
          25B Hanover Road No. 3305             101 Federal Street
          Florham Park, NJ 07932                Boston, MA 02110
          Attn:  Daniel P. Ginns, CEO           Attn:   Joseph F. Mazzella, Esq.
          Telephone: (973) 377-3900             Telephone: (617) 345-9800
          Facsimile:  (973) 377-5736            Facsimile:  (617) 345-0400

         and

         (ii)     If to the Subscribers,  at the addresses and numbers set forth
                  in Sections 9.2 and 9.3 with respect to each Subscriber

         8.7 AMENDMENTS AND WAIVERS.  Any term of this Agreement or of the Notes
may be amended and the  observance of any term of this Agreement or of the Notes
may  be  waived  (either  generally  or  in a  particular  instance  and  either
retroactively or prospectively) only with the written consent of the Company and
the holders of a majority principal amount of the Notes at the time outstanding,
provided  that (a) without the prior  written  consent of the holders of all the
Notes at the time outstanding,  no such amendment or waiver shall (i) extend the
fixed  maturity or reduce the principal  amount of, or reduce the rate or extend
the time of payment of  interest  on, or reduce the amount or extend the time of
payment of any principal or premium  payable on any redemption or prepayment of,
any Note, or (ii) reduce the aforesaid percentage of the principal amount of the
Notes the  holders of which are  required  to consent to any such  amendment  or
waiver.

                   THE REST OFTHIS PAGE IS INTENTIONALLY BLANK





                                      - 8 -

<PAGE>



         SECTION 9.  ACCREDITED INVESTOR REPRESENTATION - MUST BE COMPLETED:

         9.1 EXISTING INVESTOR:  Please check one box only: |_| New investor; or
|_| Current investor  holding Common Stock,  Warrants or other securities of the
Company.

         9.2 ACCREDITED INVESTOR REPRESENTATIONS FOR INDIVIDUALS:(Entities go to
Section 9.3 on next Page).  The Subscriber is (check all that apply):

         |_| (a) a natural person who has an individual net worth,  or, together
with his or her spouse,  has a combined  net worth in excess of  $1,000,000.  If
this category applies,  complete the following (or provide a personal  financial
statement):  Net worth (including home, home furnishings and automobiles),  over
total liabilities equals $________.

         |_| (b) a natural person who has an individual income (exclusive of any
income  attributable  to a spouse)  in excess  of  $200,000  in the last two (2)
calendar  years, or joint income with such person's spouse in excess of $300,000
for each of those years,  and reasonably  expects reaching the same income level
in the current calendar year.

         |_| (c) a director, executive officer, or general partner of the issuer
of the securities being offered or sold, or any director, executive officers, or
general partner of a general partner of that issuer.

         Executed  under seal as of the date set forth  beside the  signature of
the Company on Page 12 hereof.

Amount Subscribed For: $________________

                         SIGNATURE PAGE FOR INDIVIDUALS

     Form of Ownership                        INDIVIDUAL SIGNATURES
                                              (Print Name(s) under Signature(s))
( )     INDIVIDUAL OWNERSHIP
        (One signature required)               _________________________________

( )     TENANTS IN COMMON
        (All tenants must sign)                _________________________________

( )     JOINT TENANTS WITH RIGHTS
        OF SURVIVORSHIP                        _________________________________
        (All tenants must sign)

- ---------------------------------              ---------------------------------
(Social Security Number of Individual)

- ---------------------------------              ---------------------------------
(Street Address)                                         (Telephone)

- ---------------------------------              ---------------------------------
(City/State/Zip Code)                                  (Facsimile Number)
                             Date:__________________



                                     - 9 -

<PAGE>



         9.3 ACCREDITED INVESTOR REPRESENTATIONS FOR ENTITIES. The Subscriber is
(check all that apply):

     |_| (d) a bank as defined in Section  3(a)(2) of the Securities Act, or any
savings  and loan  association  or  other  institution  as  defined  in  Section
3(a)(5)(A) of the Securities Act,  whether acting in its individual or fiduciary
capacity.

     |_| (e) any  broker or dealer  registered  pursuant  to  Section  15 of the
Securities Exchange Act of 1934 (the "1934 Act").

     |_| (f) an insurance  company as defined in Section 2(13) of the Securities
Act.

     |_| (g) an investment  company  registered under the Investment Company Act
of 1940,  as amended  (the "1940  Act"),  or a business  development  company as
defined in Section 2(a)(48) of the 1940 Act.

     |_| (h) a small  business  investment  company  licensed by the U.S.  Small
Business  Administration  under  Section  301(c)  or (d) of the  Small  Business
Investment Act of 1958.

     |_|  (i) a plan  established  and  maintained  by a  state,  its  political
subdivisions,  or any  agency  or  instrumentality  of a state or its  political
subdivisions,  for the benefit of its employees,  which plan has total assets in
excess of $5,000,000.

     |_| (j) an  employee  benefit  plan  within  the  meaning  of the  Employee
Retirement  Income  Security  Act of 1974,  as  amended  ("ERISA"),  and (i) the
decision to invest in the Company  was made by a plan  fiduciary  (as defined in
Section  3(21) of ERISA) that is either a bank,  savings  and loan  association,
insurance company or registered investment advisor, or (ii) the employee benefit
plan has total assets in excess of $5,000,000, or (iii) if a self-directed plan,
with investment decisions made solely by persons that are accredited  investors.
The Undersigned is aware of (i) the risk/return factors,  (ii) the effect of the
plan's investment in the Securities on the  diversification,  liquidity and cash
flow needs of the plan,  and (iii) the  projected  effect of the  investment  in
meeting the plan's funding  objectives.  The  Undersigned  has concluded that an
investment in the Securities is a prudent one.

     |_| (k) a private  business  development  company  as  defined  in  Section
202(a)(22) of the  Investment  Advisers Act of 1940,  as amended (the  "Advisers
Act").

     |_| (l) an  organization  described  in Section  501(c)(3)  of the Internal
Revenue Code of 1986, as amended, (the "Code"), a corporation,  Massachusetts or
similar  business  trust,  or  partnership  not formed for  specific  purpose of
acquiring the Securities, with total assets in excess of $5,000,000.

     |_| (m) a trust, with total assets in excess of $5,000,000,  not formed for
the  specific  purpose  of  acquiring  the  Securities,  whose  purchase  of the
Securities  is  directed  by a person  who,  either  alone  or with a  purchaser
representative  has such  knowledge  and  experience  in business and  financial
matters  that  he is  capable  of  revaluating  the  merits  and  risks  of  the
prospective investment.

     |_| (n) an entity in which each of the equity  owners  (i.e.,  partners  in
partnership or Shareholders in a corporation)  meets all of the  requirements of
one of the above categories.



                                     - 10 -

<PAGE>



                           SIGNATURE PAGE FOR ENTITIES

ENTITY OWNERSHIP:                CHECK FORM OF ORGANIZATION OF ENTITY SUBSCRIBER

( ) TRUST                          (Please attach a copy of trust  instrument or
                                   in lieu  thereof an  opinion of counsel  that
                                   such trust has the  authority to purchase the
                                   Securities).

( ) CORPORATION                    (Please    include    certified     corporate
                                   resolution authorizing signature).

( ) PARTNERSHIP                    (Please  attach  a copy  of  the  partnership
                                   agreement or in lieu  thereof,  an opinion of
                                   counsel   that  such   partnership   has  the
                                   authority to purchase the Securities).

( ) EMPLOYEE BENEFIT PLAN             (Please   attach   a  copy  of  the   Plan
                                      Agreement or in lieu  thereof,  an opinion
                                      of counsel that such employee benefit plan
                                      has  the   authority   to   purchase   the
                                      Securities).

NUMBER  OF  OWNERS - If the  subscriber  is a grantor  trust,  partnership  or S
corporation,  provide the number of direct or indirect owners (or beneficiaries)
of such entity:  ___________________.  (The subscriber is required to inform the
Partnership  if this number  increases at any time during  which the  Subscriber
holds an interest in the Partnership).

         Executed  under seal as of the date set forth  beside the  signature of
the Company on Page 12 hereof.

Amount Subscribed For: $________________

ENTITY SIGNATURE:

- ---------------------------------                -------------------------------
(Print Name of Entity)                                   (Street Address)

By:______________________________                -------------------------------
(Signature of Officer or Agent)                        (City/State/Zip Code)

- ---------------------------------                -------------------------------
(Print Name and Title of Person Signing)                (Taxpayer ID Number)

- ---------------------------------                -------------------------------
(Telephone)                                             (Facsimile Number)
                             Date:__________________





                                     - 11 -

<PAGE>


                           ACCEPTANCE OF SUBSCRIPTION

                             DATAMETRICS CORPORATION


         The foregoing subscription of for 12% Subordinated  Convertible Secured
Notes in the amount of  $______________  and Warrants to purchase up to ________
shares of the Common Stock of the  Company,  is hereby  accepted by  DATAMETRICS
CORPORATION,  and the foregoing  Subscription Agreement is hereby executed under
seal by DATAMETRICS CORPORATION, this _____ day of ___________________, 199 .


                                            DATAMETRICS CORPORATION


                                            By:_________________________________
                                            Name:    Daniel P. Ginns
                                            Title:   Chief Executive Officer






                                     - 12 -



THIS NOTE IS ISSUED  WITHOUT  REGISTRATION  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "ACT"),  OR APPLICABLE  STATE SECURITIES LAWS. THIS NOTE MAY NOT BE
SOLD,  TRANSFERRED OR OTHERWISE DISPOSED OF, IN WHOLE OR IN PART, IN THE ABSENCE
OF SUCH REGISTRATION UNLESS DATAMETRICS CORPORATION (THE "COMPANY") HAS RESERVED
THE  WRITTEN  OPINION  OF THE  COMPANY'S  COUNSEL  OR OTHER  COUNSEL  REASONABLY
SATISFACTORY  TO THE COMPANY THAT,  AFTER  INVESTIGATION  OF THE RELEVANT FACTS,
SUCH  COUNSEL  IS  OF  THE  OPINION  THAT  SUCH  TRANSACTION  DOES  NOT  REQUIRE
REGISTRATION OF SUCH  SECURITIES  UNDER THE ACT OR APPLICABLE  STATE  SECURITIES
LAWS.


                             DATAMETRICS CORPORATION

            12% SENIOR SUBORDINATED CONVERTIBLE SECURED NOTE DUE 2000

$                                                         Issue Date: ____, 1999
 --------------------


         The undersigned, DATAMETRICS CORPORATION, a Delaware corporation having
its chief  executive  office at 25B Hanover  Road,  Florham  Park, NJ 07932 (the
"Company"),  for value received, hereby promises to pay to or registered assigns
(the "Holder"),  at the principal office of the Holder or at such other place as
the Holder may designate by written notice to the Company,  the principal sum of
Thousand  Dollars ($ ),  together  with all accrued  interest from and after the
date hereof then unpaid, on _______,  2000  (the"Maturity  Date"), or earlier as
shall be provided  herein.  The unpaid  principal  amount  hereof  shall  accrue
interest at the rate of twelve  percent (12%) per annum from and after the issue
date hereof until all unpaid  principal and interest  shall be paid in full. The
Company  hereby  promises to pay interest on the  principal  amount of this Note
quarterly in arrears on each  September  30,  December 31, March 31 and June 30,
during the term hereof  (each an  "Interest  Payment  Date").  Interest  will be
computed on the basis of a 360-day year of twelve 30-day months.  If any payment
shall become due  hereunder on a Saturday,  Sunday or other day on which banking
institutions  in the State of New York are  authorized  to  close,  the due date
hereof shall be extended to the next day on which such banking  institutions are
not authorized to close.

Notwithstanding  anything to the contrary herein,  any part of, or all, interest
payable on any  particular  Interest  Payment Date may be paid, at the option of
the Company, in lieu of cash, in additional 12% Senior Subordinated  Convertible
Secured Notes having the same Maturity Date as this Note  ("Additional  Notes").
An interest  payment to be made by issuance of  Additional  Note(s) shall not be
considered  paid if the  Company  has not  caused  such  Additional  Notes to be
delivered to the Holder  within thirty (30) days after the  applicable  Interest
Payment Date.

         This Note is one of a series  (the  "Notes")  issued  pursuant to a 12%
Senior  Subordinated   Convertible  Note  Subscription  Agreement  dated  as  of
________, 1999 (the "Subscription  Agreement") among the Company and the holders
of the Notes (the "Holders").

<PAGE>


         SECTION 1. DEFINITION OF SENIOR DEBT. The term "Senior Debt" shall mean
and  consist of all  present  and future  indebtedness  and  liabilities  of the
Company  (contingent  or  otherwise)  for  money  borrowed  from  banks or other
institutional  lenders   (collectively  the  "Senior  Lender"),   including  any
extension  or  renewals  thereof,  whether  outstanding  on the date  hereof  or
hereafter  created or  incurred,  which are not by their terms  subordinate  and
junior  to or on a parity  with  the  Notes at the  time  they  are  created  or
incurred,  and all related agreements and instruments  (collectively,  the "Loan
Documents"), and any extension, increase, refinancing,  refunding or replacement
of all or any part of such indebtedness entered into by the Company from time to
time.

         SECTION 2. SECURITY FOR DEBENTURES. Except as otherwise subordinated to
the right of prior payment and satisfaction in full of all Senior Debt, the full
payment by the Company to the Lender of the principal  amount  hereof,  together
with all accrued interest thereon, shall be secured in accordance with the terms
and  provisions  of that  certain  Security  Agreement,  dated  as of even  date
herewith, by and between the Company and the Holders (the "Security Agreement").

         SECTION 3.   SUBORDINATION OF NOTES.

                  (a) PAYMENT OF SENIOR  DEBT.  The  Company,  for  itself,  its
         successors and assigns,  covenants and agrees,  and each Holder of this
         Note, by its acceptance hereof likewise covenants and agrees,  that the
         obligations,  liability and  indebtedness  of the Company  evidenced by
         this Note and the payment of the  principal  amount hereof and interest
         thereon shall be subordinate in right of payment,  to the extent and in
         the manner hereinafter set forth, to the prior payment and satisfaction
         in full of all  Senior  Debt,  and each  Holder  of this Note will not,
         without the express prior written consent of the Senior Lender, take or
         receive,  and the Company  will not make,  give or permit,  directly or
         indirectly,  by set-off,  redemption,  purchase or in any other manner,
         including,  without  limitation,  any  foreclosure  under the  Security
         Agreement on the Company's  Collateral  (as such term is defined in the
         Security  Agreement),  any payment on, whether of interest or principal
         or security for the whole or any part of, the obligations  evidenced by
         this Note; PROVIDED,  HOWEVER that so long as no event of default under
         the Senior Debt shall have  occurred  and then be  continuing  or would
         occur as a result of, or after  giving  effect to,  such  payment,  the
         Company may make,  and the Holder of this Note may  receive,  quarterly
         payments in arrears of  interest  accrued  under this Note.  Except for
         payments permitted by this Section 3, no payment or distribution of any
         kind or character,  whether in cash, property or securities (including,
         without   limitation,   proceeds  or  collateral  for  the  obligations
         evidenced by this Note),  which, but for the  subordination  provisions
         contained  herein,  would  otherwise be payable or  deliverable  to the
         Holder upon or in respect of the  obligations  evidenced  by this Note,
         shall be paid to the Holder, and, except for payments permitted by this
         Section 3, the Holder  shall not receive or accept any such  payment or
         distribution or any benefit  therefrom unless and until the Senior Debt
         shall  have  been  fully  paid  and  satisfied.  Without  limiting  the
         generality of the foregoing  provisions of this Section 3, in the event
         of any liquidation,  termination, revocation or other winding-up of the
         Company,   or  in   the   event   of  any   receivership,   insolvency,
         reorganization or bankruptcy proceedings, assignment for the benefit of
         creditors  or any  proceeding  by or against the Company for any relief
         under any bankruptcy, reorganization or insolvency law or laws, federal
         or state,  or any law,  federal  or state,  relating  to the  relief of
         debtors, readjustment of




                                       -2-

<PAGE>


         indebtedness, reorganization, composition or extension of indebtedness,
         then,  and in any such  event,  all Senior  Debt shall first be paid in
         full,  before any  payment or  distribution  is made in respect of this
         Note, and any payment or distribution of any kind or character, whether
         in  cash,  property  or  securities  (including,   without  limitation,
         proceeds or collateral for this Note), which, but for the subordination
         provisions  contained herein, would otherwise be payable or deliverable
         to the Holder  upon or in respect of this Note,  shall  instead by paid
         over or delivered to the Senior  Lender or its  representatives  if the
         Senior  Debt has not been paid in full and  satisfied,  and the  Holder
         shall not  receive  any such  payment or  distribution  or any  benefit
         therefrom  unless and until the Senior  Debt shall have been fully paid
         and satisfied.

                  (b) SCOPE OF SECTION.  The  provisions  of this  Section 3 are
         intended  solely for the purpose of defining the relative rights of the
         holder of the Debenture, on the one hand, and the holders of the Senior
         Debt,  on the  other  hand.  Nothing  contained  in this  Section  3 is
         intended to or shall  impair,  as between the  Company,  its  creditors
         (other than the holders of Senior Debt) and the Holder,  the obligation
         of Company,  which is unconditional and absolute, to pay to the Holders
         the  principal  of and  interest  due on the Notes as and when the same
         shall become due and payable in accordance with the terms hereof, or to
         affect the relative  rights of the Holders and creditors of the Company
         other than the holders of the Senior Debt,  nor shall  anything  herein
         prevent the Holder from accepting any payment with respect to such Note
         or exercising all remedies  otherwise  permitted by applicable law upon
         default  under such Note,  subject to the  rights,  if any,  under this
         Section 3, of the holders of Senior Debt, in respect of cash,  property
         or securities of the Company received by the Holder of the Note.

         SECTION  4A.  PREPAYMENTS.  Subject to the  restrictions  contained  in
Section 3 hereof, upon 15 days advance notice to the Holder (during which period
the Holder  shall  retain the rights set forth in Section 4B below) the  Company
may  prepay  at any time  all or any part of the  principal  amount  owing  with
respect to this  Note,  which  payment of  principal  shall  include  the unpaid
interest  accrued on the principal  amount repaid through the date of repayment,
without  penalty,  but at a  premium  equal to 110% of the  principal  amount so
repaid.

         SECTION 4B. CONVERSION RIGHTS.  The Holder is entitled,  at its option,
at any time and from  time to time  while  this  Note  remains  outstanding,  to
convert  this Note into that  number of shares of fully  paid and  nonassessable
shares of Common  Stock  which is to be derived  from  dividing  the  Conversion
Amount by the Conversion  Price (the  "Conversion  Rate").  For purposes of this
Note, the Conversion  Amount shall mean the principal  dollar amount of the Note
being converted and,  subject to adjustment as herein  provided,  the Conversion
Price  shall be equal to $1.00 per share of Common  Stock.  Any such  conversion
shall be made in accordance with the following terms and conditions:

         (a)      The  Holder  may  exercise  its right to  convert  the Note by
                  telecopying  an executed and  completed  notice of  conversion
                  (the "Notice of Conversion") to the Company and delivering the
                  original  Notice of  Conversion  and the original  Note to the
                  Company  by express  courier.  Each  business  date on which a
                  Notice of  Conversion  is  telecopied  to and  received by the
                  Company in  accordance  with the  provisions  hereof  shall be
                  deemed a  "Conversion  Date".  The Company  will  transmit the
                  certificates representing



                                       -3-

<PAGE>



                  shares of Common Stock  issuable  upon  conversion of the Note
                  (together with a replacement Note  representing the amount not
                  so converted) to the Holder via express courier, by electronic
                  transfer or otherwise  within five (5) business days after the
                  Conversion  Date if the  Company  has  received  the  original
                  Notice of Conversion and Note being so converted by such date.
                  In addition to any other  remedies  which may be  available to
                  the  Holder,  in the event  that the  Company  fails to effect
                  delivery of such shares of Common  Stock  within five (5) such
                  business day period, the Holder will be entitled to revoke the
                  Notice of  Conversion by delivering a notice to such effect to
                  the Company whereupon the Company and the Holder shall each be
                  restored to their respective  positions  immediately  prior to
                  delivery of the Notice of Conversion. The Notice of Conversion
                  and Note  representing the portion of the Note converted shall
                  be delivered to the Company as herein below provided.

         (b)      In the event that the Common Stock issuable upon conversion of
                  the Note is not  delivered  within five (5)  business  days of
                  receipt by the Company of a valid Notice of Conversion and the
                  Note to be converted,  the Company shall pay to the Holder, in
                  immediately   available  funds,  upon  demand,  as  liquidated
                  damages  for  such  failure  and not as a  penalty,  for  each
                  $100,000 principal amount of Note sought to be converted, $500
                  per day that the  shares  of Common  Stock are not  delivered,
                  which liquidated damages shall run from the sixth business day
                  after the  Conversion  Date up until the time that  either the
                  Conversion Notice is revoked or the Common Stock is delivered,
                  at which time such liquidated damages shall cease. Any and all
                  payments  required pursuant to this paragraph shall be payable
                  only in cash.

         (c)      The  number  of  shares  of  Common  Stock  issuable  upon the
                  conversion  of the Note,  and the  Conversion  Price  shall be
                  subject to adjustment as follows:

                  (i) In case the  Company  shall (A) pay a  dividend  on Common
                  Stock  in  Common  Stock  or  securities   convertible   into,
                  exchangeable  for or otherwise  entitling a Holder  thereof to
                  receive Common Stock,  (B) declare a dividend  payable in cash
                  on its Common Stock and at  substantially  the same time offer
                  its  Shareholder  a right to  purchase  new  Common  Stock (or
                  securities  convertible  into,  exchangeable  for or otherwise
                  entitling  a Holder  thereof to  receive  Common  Stock)  from
                  proceeds of such dividend (all Common Stock so issued shall be
                  deemed to have been issued as a stock dividend), (C) subdivide
                  its  outstanding  shares of Common Stock into a greater number
                  of shares of Common Stock, (D) combine its outstanding  shares
                  of  Common  Stock  into a  smaller  number of shares of Common
                  Stock,  or (E) issue by  reclassification  of its Common Stock
                  any  shares  of Common  Stock of the  Company,  the  number of
                  shares of Common Stock  issuable  upon  conversion of the Note
                  immediately prior thereto shall be adjusted so that the Holder
                  shall be entitled to receive after the happening of any of the
                  events  described  above that number and kind of shares as the
                  Holder  would  have  received  had  the  Note  been  converted
                  immediately prior to the happening of such event or any record
                  date with respect  thereto.  Any  adjustment  made pursuant to
                  this subdivision shall become effective  immediately after the
                  close of  business  on the record  date in the case of a stock
                  dividend and shall



                                       -4-

<PAGE>



                  become  effective  immediately  after the close of business on
                  the  record  date in the case of a stock  split,  subdivision,
                  combination or reclassification.

                  (ii) Any  adjustment  in the numbers of shares of Common Stock
                  issuable  hereunder  otherwise  required  to be  made  by this
                  paragraph  4.B.(c) will not have to be made if such adjustment
                  would not require an increase or decrease in one (1%)  percent
                  or more in the number of shares of Common Stock  issuable upon
                  conversion of this Note.

                  (iii)  Whenever the number of shares of Common Stock  issuable
                  upon  the  conversion  of this  Note  is  adjusted  as  herein
                  provided,  the  Conversion  Price  shall be  adjusted  (to the
                  nearest cent) by multiplying such Conversion Price immediately
                  prior to such  adjustment by a fraction of which the numerator
                  shall be the number of shares of Common  Stock  issuable  upon
                  the  conversion  of  this  Note  immediately   prior  to  such
                  adjustment,  and of which the denominator  shall be the number
                  of shares of Common Stock issuable immediately thereafter.

         (d)      In the case of any:

                  (i)  consolidation  or merger of the  Company  into any entity
                  (other than a consolidation  or merger that does not result in
                  any reclassification,  conversion, exchange or cancellation of
                  outstanding shares of Common Stock of the Company),

                  (ii)  sale,   transfer,   lease  or   conveyance   of  all  or
                  substantially  all of the assets of the Company as an entirety
                  or substantially as an entirety, or

                  (iii)  reclassification,  capital  reorganization or change of
                  the Common Stock (other than solely a change in par value,  or
                  from par value to no par value),

                  in each case as a result of which shares of Common Stock shall
                  be converted  into the right to receive  stock,  securities or
                  other property  (including cash or any  combination  thereof),
                  each  Holder of a Note then  outstanding  shall have the right
                  thereafter  to  convert  Note only into the kind and amount of
                  securities,  cash and  other  property  receivable  upon  such
                  consolidation,  merger, sale, transfer, capital reorganization
                  or  reclassification  by a holder  of the  number of shares of
                  Common  Stock of the  Company  into which such Note would have
                  been  converted   immediately  prior  to  such  consolidation,
                  merger,    sale,   transfer,    capital    reorganization   or
                  reclassification,  ASSUMING such holder of Common Stock of the
                  Company:   (A)  is  not  an  entity  with  which  the  Company
                  consolidated  or into which such sale or transfer was made, as
                  the case may be ("constituent entity"), or an affiliate of the
                  constituent  entity,  and (B)  failed to  exercise  his or her
                  rights  of  election,  if any,  as to the  kind or  amount  of
                  securities,  cash and  other  property  receivable  upon  such
                  consolidation,   merger,  sale  or  transfer.   If  necessary,
                  appropriate adjustment shall be made in the application of the
                  provision  set forth  herein  with  respect  to the rights and
                  interest  thereafter  of the  Holders,  to the  end  that  the
                  provisions set forth herein shall thereafter correspondingly




                                       -5-

<PAGE>



                  be  made  applicable,  as  nearly  as may  reasonably  be,  in
                  relation  to any  shares  of  stock  or  other  securities  or
                  property  thereafter  deliverable  on the  conversion  of this
                  Note.

         (e)      The  above  provisions  shall  similarly  apply to  successive
                  consolidations,    mergers,    sales,    transfers,    capital
                  reorganizations and  reclassifications.  The Company shall not
                  effect any such consolidation, merger, sale or transfer unless
                  prior to or simultaneously  with the consummation  thereof the
                  successor  Company  or  entity  (if  other  than the  Company)
                  resulting from such  consolidation,  merger,  sale or transfer
                  shall assume, by written instrument, the obligation to deliver
                  to the Company  such  shares of Common  Stock,  securities  or
                  assets as, in accordance with the foregoing  provisions,  such
                  Holder may be  entitled  to receive  under this  Section.  The
                  Company  will  not,  by  amendment  of  its   Certificate   of
                  Incorporation or through any reorganization, recapitalization,
                  transfer of assets, consolidation,  merger, dissolution, issue
                  or sale of securities or any other voluntary action,  avoid or
                  seek to avoid  the  observance  or  performance  of any of the
                  terms to be observed or  performed  hereunder  by the Company,
                  but will at all times in good faith assist in the carrying out
                  of all the  provisions of this  paragraph and in taking of all
                  such action as may be  necessary  or  appropriate  in order to
                  protect  the   conversion   rights  of  the  Holders   against
                  impairment.

         SECTION  4.C.  OPTIONAL  CALL.  In the event the  Closing Bid Price (as
hereunder  defined) of the Common  Stock is greater  than $2.00 (U.S.) per share
(the  "Target  Price")  for  twenty  (20)  consecutive  trading  days (the "Call
Period"), at any time that either:

         (i)      the  Company  has on file  with the  Securities  and  Exchange
                  Commission (the  "Commission") a fully effective  registration
                  statement  under the  Securities  Act of 1933, as amended (the
                  "ACT")  covering  all  shares of Common  Stock  issuable  upon
                  conversion of this Note, or

          (ii)    the shares of Common Stock  issuable  upon  conversion of this
                  Note may be sold without any restriction pursuant to the rules
                  of the  Commission as determined by the counsel to the Company
                  pursuant to a written opinion letter,

the  Company  shall  have the right to "Call"  this  Note,  in whole or in part,
thereby  forcing  conversion by the Holder at the Conversion  Price.  The Target
Price shall be adjusted  proportionately  to reflect any  adjustments due to the
payment of a stock  dividend,  stock split,  combination  of shares or any other
similar event. For purposes  hereof,  the "Closing Bid Price" shall be deemed to
be the  reported  last bid price  regular way as reported by  Bloomberg LP or if
unavailable,  on the principal national  securities exchange on which the Common
Stock is listed or admitted to trading,  or if the Common Stock is not listed or
admitted to trading on any national securities  exchange,  the closing bid price
as reported by NASDAQ or such other  system then in use, or, if the Common Stock
is  not  quoted  by  any  such  organization,  the  closing  bid  price  in  the
over-the-counter  market  as  furnished  by the  principal  national  securities
exchange on which the Common Stock is traded.

         (a)      The  Company  may  exercise  its right to Call by  telecopying
                  written  notice (the "Call  Notice") to the Holder within five
                  (5) trading days after the  aforementioned  twenty consecutive
                  trading day period.




                                       -6-

<PAGE>


         (b)      Once the  Company  has  exercised  its right to Call by giving
                  written  notice to the Holder it shall be deemed  irrevocable.
                  Each trading day on which the Call Notice is telecopied to and
                  received by the Holder shall be deemed a  Conversion  Date for
                  the  purposes  of  completing  this Call and  calculating  the
                  number of shares of Common Stock to be issued upon conversion.
                  The Company will transmit the certificates representing shares
                  of Common Stock  issuable  pursuant to the Call (together with
                  the replacement Notes representing the principal amount of the
                  Note not Called, if any) to the Holder via express courier, by
                  electronic  transfer or otherwise within five (5) trading days
                  after the Call  Notice was served  upon the Holder  (the "Call
                  Date").

         (c)      The Call Notice shall set forth (i) a calculation  referencing
                  the conversion  formula contained herein showing the number of
                  shares of Common  Stock  being  issued  pursuant to this Call,
                  (ii) a calculation referencing all accrued and unpaid interest
                  which  shall be payable  by the  Company on or before the Call
                  Date,  and (iii) a statement  that  interest on the Note being
                  Called will cease to accrue on such Call Date. The Call Notice
                  shall be irrevocable  by the Company,  and it shall be sent at
                  least five (5)  trading  days prior to the  expiration  of the
                  Call Period to the Holder.  If less than all of the  principal
                  amount of the Note  owned by the Holder are then to be Called,
                  the Call Notice shall specify the amount thereof that is to be
                  Called.

         (d)      The portion of this Note being Called  shall be  automatically
                  canceled and  converted  into a right to receive the shares of
                  Common Stock, and all rights of this Note, including the right
                  to conversion shall cease without further action.  Immediately
                  following  the Call Date,  the Holder  shall  surrender  their
                  original  Note being called at the office of the Company,  and
                  the  Company  shall  issue  to the  Holder  a new Note for the
                  principal amount that remains outstanding, if any.

         (e)      The number of shares of Common Stock issuable upon the Call of
                  the Note shall be adjusted in accordance  with the  provisions
                  set forth in Section 4.B(d).

         SECTION 5.  EXCHANGE OF NOTES.  The Company  shall keep at its office a
register in which the Company  shall provide for the  registration  of this Note
and for the  registration of exchange of this Note.  Subject to the restrictions
on this Note  provided  elsewhere  herein,  and subject to the  restrictions  of
applicable securities and other laws, the registered Holder of this Note may, at
its option and either in person or by duly  authorized  attorney,  surrender the
same at such office,  and without  expense to such Holder  (other than  transfer
taxes, if any),  receive in exchange  therefor a Note, dated as of the date from
which  unpaid  interest  has  been  accrued  on the  Note so  exchanged,  in the
principal amount hereof, and registered in the name of such person or registered
assign, as may be designated by such Holder. Every Note so made and delivered in
exchange for this Note shall in all other  respects be in the same form and have
the same terms as this Note. The Company may treat the person in whose name this
Note is  registered  as the owner and  Holder  of this Note for the  purpose  of
making  payment of  principal  of, and  interest on, this Note and for all other
purposes whatsoever,  whether or not this Note shall be overdue, and the Company
shall not be affected by notice to the contrary.




                                       -7-

<PAGE>


         SECTION 6. LOSS,  THEFT,  DESTRUCTION OR MUTILATION OF THIS NOTE.  Upon
receipt by the Company of evidence reasonably satisfactory to the Company of the
loss,  theft,  destruction or mutilation of this Note, and, in the case of loss,
theft or destruction,  of indemnity or security  reasonably  satisfactory to the
Company,  and upon  reimbursement  to the  Company  of all  reasonable  expenses
incidental thereto,  or, in case of mutilation,  upon surrender and cancellation
of this Note,  the Company  will make and  deliver a new Note of like tenor,  in
lieu of this Note. Any Note made and delivered in accordance with the provisions
of this Section 6 shall be dated as of the date to which  interest has been paid
on this Note.

         SECTION 7. TRANSFER OF NOTE. The Holder of this Note, by its acceptance
hereof,  agrees  that it will not sell,  transfer or  otherwise  dispose of this
Note,  in whole or in part,  in the absence of  registration  under the Act, and
applicable state  securities  laws,  unless the Company has received the written
opinion of its counsel (or other counsel reasonably satisfactory to the Company)
that, after  investigation of the relevant facts, that such transaction does not
require registration under said Act or applicable state securities laws.

         SECTION 8. EVENTS OF DEFAULT.  The entire  unpaid  portion of this Note
may be declared immediately due and payable by a Holder of this Note, by written
notice from such Holder to the Company upon the happening and  continuing of any
of the following events (each an "Event of Default"):

         (a)      The  Company  shall  default in the  payment of  principal  or
                  interest  under this Note when the same  shall  become due and
                  payable and such default shall remain  uncured for twenty (20)
                  days or more  after  notice  of such  default  is given to the
                  Company by such Holder;

         (b)      The Company shall default in the  performance  of any material
                  obligation  under any of the Loan  Documents  and such default
                  results in the  acceleration  of any material  indebtedness of
                  the Company to the Senior Lender for amounts owing thereunder;

         (c)      The Company or any present or future subsidiary of the Company
                  shall make an assignment for the benefit of creditors or shall
                  admit in writing its inability to pay its debts as they become
                  due, or shall file a  voluntary  petition  in  bankruptcy,  or
                  shall be  adjudicated a bankrupt or  insolvent,  or shall file
                  any  arrangement,  composition,   readjustment,   liquidation,
                  dissolution  or  similar  relief  under any  present or future
                  statute,  law  or  regulation   pertaining  to  insolvency  or
                  creditors'  rights,  or shall  file any answer  admitting  the
                  material  allegations  of a petition  filed  against it in any
                  such  proceeding,  or shall seek or consent to or acquiesce in
                  the  appointment of any trustee,  receiver or liquidator of it
                  or all or any substantial part of its properties; or

         (d)      Any  proceeding is filed against the Company or any present or
                  future subsidiary of the Company,  seeking any reorganization,
                  arrangement,    composition,    readjustment,     liquidation,
                  dissolution  or  similar  relief  under any  present or future
                  statute,   law  or   regulation   pertaining  to  solvency  or
                  creditors'  rights,  and such  proceeding  continues for sixty
                  (60) days undismissed, unstayed, unbonded and discharged.



                                       -8-

<PAGE>


         SECTION 9. REIMBURSEMENT. The Company agrees to reimburse the Holder of
this Note for all its costs and expenses,  including reasonable  attorneys' fees
and  disbursements,  expended in  collecting  any amounts  due  hereunder  or in
otherwise enforcing any of its rights hereunder.

         SECTION 10. NOTICES. All notices and other  communications  required or
permitted  to be given in respect of this Note shall be in writing  and shall be
given as and  shall be deemed  to have  been  given if so  given)  by  delivery,
telegram,  telex or facsimile, or by mail (registered or certified mail, postage
prepaid,  return receipt  requested) or by any courier service,  such as Federal
Express,  providing  proof of delivery,  provided  that any notice  delivered as
herein  provided shall also be delivered by facsimile (if a facsimile  number is
provided below) at the time of such delivery. All communications hereunder shall
be delivered to the  respective  parties at the following  addresses (or at such
other  address for a party as shall be specified by like notice,  provided  that
notices of a change of address shall be effective only upon receipt thereof):

         (a)      If to the Company, to:

                  Datametrics Corporation
                  25B Hanover Road; #3305
                  Florham Park, NJ 07932
                  Attn.: Daniel P. Ginns, CEO
                  Facsimile No.: (973) 377-5736

                  With a copy to:

                  Lane Altman & Owens LLP
                  101 Federal Street
                  Boston, MA 02110
                  Attn: Joseph F. Mazzella
                  Facsimile No.: (617) 345-0400

         (b)      If to the Holder, to:



         SECTION 11. GOVERNING LAW. This Note has been executed and delivered in
the State of New Jersey and shall be governed  by and  construed  in  accordance
with the laws of the State of New Jersey without  reference to the principles of
conflicts of law thereof.

         SECTION 12.  JURISDICTION.  The Company hereby irrevocably consents and
submits to, and each Holder of this Note,  by its  acceptance  hereof,  likewise
hereby  irrevocably  consents and submits to, the exclusive  jurisdiction of the
United States  District Court for the District of New Jersey in connection  with
any proceeding  arising out of or relating to this Note, waives any objection to
venue in such  District  (unless such court lacks  jurisdiction  with respect to
such proceeding in which case, the Company irrevocably  consents and submits to,
and each Holder of this Note, by its  acceptance  hereof,  likewise  irrevocably
consents and submits to, the jurisdiction of the Courts of the State of New




                                       -9-

<PAGE>


Jersey in connection  with such  proceeding and waives any objection to venue in
any court of appropriate  jurisdiction  in the State of New Jersey),  and agrees
that service of any summons, complaint, notice or other process relating to such
proceeding may be effected in the manner provided by Section 10 hereof.

         SECTION 13. SUCCESSORS AND ASSIGNS. All of the covenants, stipulations,
proses and  agreements of the Company set forth in this Note shall be binding on
its successor and assigns, whether so expressed or not.

         SECTION 14. HEADINGS.  The section headings  contained in this Note are
inserted for  reference  purposes  only and shall not be deemed to  constitute a
part hereof.

         SECTION  15.  WAIVERS.  The  terms  of this  Note  may not be  amended,
modified,  waived or eliminated except by a written  instrument duly executed by
the Company and the Holder of this Note.


         IN WITNESS  WHEREOF,  the  Company has caused this Note to be signed in
its corporate  name by a duly  authorized  officer and to be dated as of the day
and year first above written.

                                               DATAMETRICS CORPORATION


                                               By:______________________________
                                                  Name: Daniel P. Ginns
                                                  Title: Chairman and CEO






                                      -10-




NEITHER THIS WARRANT NOR ANY SHARES OF COMMON STOCK  ISSUABLE  UPON THE EXERCISE
OF THIS  WARRANT  HAVE BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS
AMENDED,  AND THE RULES AND REGULATIONS  PROMULGATED  THEREUNDER (THE "ACT"), OR
APPLICABLE  STATE  SECURITIES  LAWS.  THIS WARRANT AND THE COMMON STOCK ISSUABLE
UPON EXERCISE OF THIS WARRANT MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
SECURITIES LAWS UNLESS DATAMETRICS  CORPORATION (THE "COMPANY") HAS RECEIVED THE
WRITTEN   OPINION  OF  THE  COMPANY'S   COUNSEL  OR  OTHER  COUNSEL   REASONABLY
SATISFACTORY THE COMPANY THAT, AFTER  INVESTIGATION OF THE RELEVANT FACTS,  SUCH
COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION  DOES NOT REQUIRE  REGISTRATION
UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.


No.____


                        WARRANT TO PURCHASE COMMON STOCK

                             DATAMETRICS CORPORATION

              VOID AFTER 5:00 P.M., NEW YORK TIME ON AUGUST __, 2004


This certifies that, for value  received,____________________ or its permissible
transferees,  designees, successors and assigns (collectively, the "Holder"), is
entitled,  subject to the terms set forth below,  to purchase  from  Datametrics
Corporation, a Delaware corporation (the "Company"), THE NUMBER OF SHARES OF THE
COMPANY'S COMMON STOCK,  PAR VALUE $.01 PER SHARE (THE "COMMON  STOCK"),  AS SET
FORTH IN ON THE SIGNATURE  PAGE HEREOF UPON SURRENDER  HEREOF,  at the principal
office of the Company  referred to below,  with the Notice of Exercise  attached
hereto duly executed,  and simultaneous  payment therefor in lawful money of the
United States,  or otherwise as hereinafter  provided,  at the exercise price as
set forth in  Section 2 hereof.  The number of,  and  exercise  price for,  such
shares of Common Stock are subject to adjustment as provided herein.

         1. TERM OF  WARRANT.  Subject  to the terms  and  conditions  set forth
herein, this Warrant shall be exercisable,  in whole or in part, during the term
commencing on the date hereof (the "Warrant  Issue Date" and  terminating  on or
before  5:00 p.m.,  New York time, on August__,  2004 (the  "Warrant  Expiration
Date").  Outstanding Warrants not exercised prior to the Warrant Expiration Date
shall become void and all rights  thereunder  and all rights in respect  thereof
shall cease as of such time.



<PAGE>


         2.  EXERCISE  PRICE.  The  exercise  price  shall be $1.10 per share of
Common Stock (the "WARRANT EXERCISE PRICE").

         3. EXERCISE OF WARRANT.  (a) This Warrant is exercisable by the Holder,
in whole or in part, at any time,  or from time to time,  during the term hereof
as described in Section 1 hereof,  by the surrender of this  Certificate and the
Notice of Exercise  annexed  hereto duly completed and executed on behalf of the
Holder,  at the office of the  Company  (or such  other  office or agency of the
Company as it may designate by notice in writing to the Holder at the address of
the Holder  appearing on the books of the  Company),  upon payment in cash or by
check  acceptable  to the Company,  for the  purchase  price of the shares to be
purchased.  Upon payment in full of all Notes,  this  Warrant  shall be canceled
automatically  as to all  shares  of  Common  Stock  as to  which it is not then
exercisable.

                  (b)  This  Warrant  shall be  deemed  to have  been  exercised
immediately  prior to the close of  business  on the date of its  surrender  for
exercise as provided in Section 3 (a) hereof, and the person entitled to receive
the shares of Common Stock  issuable upon such exercise shall be treated for all
purposes  as the holder of record of such  shares as of the close of business on
such date. Unless exercised in connection with an underwritten  public offering,
as promptly  as  practicable  on or after such date and in any event  within ten
(10) days thereafter,  the Company at its expense shall issue and deliver to the
person or persons entitled to receive the same a certificate or certificates for
the number of shares issuable upon such exercise. In the event that this Warrant
is exercised in part,  the Company at its expense will execute and deliver a new
Warrant  of like  tenor  exercisable  for the  number of shares  for which  this
Warrant  may  then be  exercised.  In the  event of  exercise  at the time of an
underwritten  public offering,  the Company will provide  instructions as to the
exercise of this Warrant and the issuance of certificates.

         4. NO  FRACTIONAL  SHARES  OR  SCRIP.  No  fractional  shares  or scrip
representing  fractional  shares  shall  be  issued  upon the  exercise  of this
Warrant.  In lieu of any fractional share to which the Holder would otherwise be
entitled,  the Company  shall make a cash payment  equal to the  exercise  price
multiplied by such fraction.

         5.  REPLACEMENT  OF  WARRANT.   Upon  receipt  of  evidence  reasonably
satisfactory to the Company, in its sole and absolute  discretion,  of the loss,
theft, destruction or mutilation of this Warrant and, in the case of loss, theft
or destruction,  upon delivery of an indemnity agreement reasonably satisfactory
in form  and  substance  to the  Company  or,  in the case of  mutilation,  upon
surrender and  cancellation  of this  Warrant,  the Company at its expense shall
execute and deliver,  in lieu of this  Warrant,  a new warrant of like tenor and
amount.

         6. RIGHTS OF STOCKHOLDERS.  The Holder shall not be entitled to vote or
receive  dividends  or be  deemed  the  holder  of  Common  Stock  or any  other
securities  of the  Company  that may at any time be  issuable  on the  exercise
hereof for any  purpose,  nor shall  anything  contained  herein be construed to
confer  upon the  Holder,  as such,  any of the rights of a  stockholder  of the
Company or any right to vote for the  election of  directors  or upon any matter
submitted to stockholders at any meeting thereof, or to give or withhold consent
to any corporate action (whether upon any  recapitalization,  issuance of stock,
reclassification of stock, consolidation,




                                      - 2 -

<PAGE>


merger or otherwise) or to receive notices of meetings,  or to receive dividends
or subscription  rights or otherwise until the Warrant shall have been exercised
and the shares of Common Stock  purchasable  upon the exercise hereof shall have
been issued, as provided herein.

         7. COMPLIANCE WITH SECURITIES LAWS. (a) The Holder of this Warrant,  by
acceptance  hereof,  acknowledges  that the shares of Common  Stock to be issued
upon exercise  hereof are being acquired solely for the Holder's own account and
not as a nominee for any other party,  and for  investment,  and that the Holder
will not offer,  sell or  otherwise  dispose of any shares of Common Stock to be
issued upon exercise hereof,  except under circumstances that will not result in
a violation of the United States Securities Act of 1933, as amended (the "Act"),
or any foreign or state  securities  laws.  Upon exercise of this  Warrant,  the
Holder  shall,  if  requested  by the  Company,  confirm in  writing,  in a form
satisfactory  to the Company,  that the shares of Common Stock so purchased  are
being acquired solely for the Holder's, own account and not as a nominee for any
other party, for investment, and not with a view toward distribution or resale.

                  (b) All shares of Common Stock issued upon exercise hereof may
be stamped or  imprinted  with the  following  legend (in addition to any legend
required by the Act and the  securities  laws of any state of the United States)
as determined by counsel for the Company:

         THESE  SHARES  HAVE  NOT  BEEN  REGISTERED   UNDER  THE  UNITED  STATES
         SECURITIES  ACT OF 1933,  AS  AMENDED,  AND THE RULES  AND  REGULATIONS
         PROMULGATED  THEREUNDER  (THE "ACT"),  OR APPLICABLE  STATE  SECURITIES
         LAWS, AND MAY NOT BE OFFERED,  SOLD,  TRANSFERRED OR OTHERWISE DISPOSED
         OF IN THE ABSENCE OF  REGISTRATION  UNDER THE ACT OR  APPLICABLE  STATE
         SECURITIES  LAWS UNLESS  DATAMETRICS  CORPORATION  (THE  "COMPANY") HAS
         RECEIVED THE WRITTEN OPINION OF THE COMPANY'S  COUNSEL OR OTHER COUNSEL
         REASONABLY SATISFACTORY TO THE COMPANY THAT, AFTER INVESTIGATION OF THE
         RELEVANT  FACTS,  SUCH COUNSEL IS OF THE OPINION THAT SUCH  TRANSACTION
         DOES  NOT  REQUIRE  REGISTRATION  UNDER  THE  ACT OR  APPLICABLE  STATE
         SECURITIES LAWS.

         8.  RESTRICTIONS ON TRANSFER OF UNDERLYING  COMMON STOCK. The Holder of
this  Warrant by  acceptance  hereof  agrees that the  transfer of the shares of
Common Stock issuable upon the exercise of all or any portion of this Warrant is
subject to the provisions of this Warrant, which include certain restrictions on
the transfer of such shares of Common Stock.

         9. RESERVATION OF COMMON STOCK. The Company hereby covenants and agrees
that during the term that this Warrant is exercisable,  the Company will reserve
from its authorized and unissued  shares of Common Stock a sufficient  number of
shares to provide  for the  issuance of Common  Stock upon the  exercise of this
Warrant  and,  from time to time,  will take all  steps  necessary  to amend its
Certificate of Incorporation to provide a sufficient reserve of shares of Common
Stock issuable upon exercise of the Warrant.  The Company further covenants that
all shares that may be issued upon the  exercise of rights  represented  by this
Warrant and payment of




                                      - 3 -

<PAGE>


the exercise price, all as set forth herein,  will be free from all taxes, liens
and charges in respect of the issue thereof  (other than taxes in respect of any
transfer occurring contemporaneously or otherwise specified herein). The Company
agrees that its issuance of this Warrant shall  constitute full authority to its
officers  who are  charged  with the duty of  executing  stock  certificates  to
execute and issue the necessary certificates for shares of Common Stock upon the
exercise of this Warrant.

         10.  NOTICES.  (a)  Whenever  the  exercise  price or  number of shares
purchasable  hereunder  shall be  adjusted  pursuant  to Section 12 hereof,  the
Company shall issue a  certificate  signed by its Secretary  setting  forth,  in
reasonable  detail,  the  event  requiring  the  adjustment,  the  amount of the
adjustment,  the method by which such adjustment was calculated and the exercise
price and number of shares  purchasable  hereunder  after giving  effect to such
adjustment,  and shall cause a copy of such  certificate  to be mailed (by first
class mail, postage prepaid to the Holder of this Warrant.

                  (b) In  case:  (i) the  Company  shall  take a  record  of the
holders of its Common Stock (or other stock or securities at the time receivable
upon the exercise of this Warrant) for the purpose of entitling  them to receive
any dividend or other  distribution,  or any right to subscribe  for or purchase
any  shares of stock of any class or any other  securities,  or to  receive  any
other  right;  or  (ii)  of  any  capital  reorganization  of the  Company,  any
reclassification  of the capital  stock of the  Company,  any  consolidation  or
merger of the Company with or into another  corporation,  or any sale,  lease or
conveyance of all or  substantially  all of the assets of the Company to another
person; or (iii) of any voluntary dissolution,  liquidation or winding-up of the
Company,  then,  and in each such  case,  the  Company  will mail or cause to be
mailed to the  Holder a notice  specifying,  as the case may be, (A) the date on
which a record is to be taken for the purpose of such dividend,  distribution or
right,  and stating the amount and character of such dividend,  distribution  or
right,  or  (B)  the  date  on  which  such  reorganization,   reclassification,
consolidation,  merger, conveyance, dissolution, liquidation or winding-up is to
take  place,  and the time,  if any is to be fixed,  as of which the  holders of
record of Common Stock (or such stock or securities at the time  receivable upon
the  exercise of this  Warrant)  shall be entitled to exchange  their  shares of
Common  Stock  (or such  other  stock or  securities)  for  securities  or other
property deliverable upon such reorganization, reclassification,  consolidation,
merger, conveyance, dissolution, liquidation or winding-up. Such notice shall be
mailed at least ten (10) days prior to the date therein specified.

                  (c) All such  notices  and  communications  shall be deemed to
have been  received  (i) in the case of personal  delivery,  on the date of such
delivery and (ii) in the case of mailing,  on the second  business day following
the date of such mailing.

         11.  AMENDMENTS.  (a) Any term of this  Warrant may be amended with the
written  consent of the Company and the holders of warrants  which, if exercised
would  then  represent  not less than a majority  of the shares of Common  Stock
issuable upon exercise of any and all outstanding  warrants for shares of Common
Stock  issued by the Company on the date hereof (the "COMMON  STOCK  WARRANTS"),
even  without the  specific  consent of the  Holder.  An  amendment  effected in
accordance  with this Section 11 shall be binding upon each holder of any of the
Common Stock Warrants, each future holder of all such Common Stock Warrants, and
the




                                      - 4 -

<PAGE>


Company.  The Company shall  promptly give notice to all holders of Common Stock
Warrants of any amendment effected in accordance with this Section 11.

                  (b) No  waivers of or  exceptions  to any term,  condition  or
provision of this Warrant, in any one or more instances,  shall be deemed to be,
or construed as, a further or continuing  waiver of any such term,  condition or
provision.

         12.  ADJUSTMENTS;  ANTIDILUTION.  The exercise prices and the number of
shares  purchasable  hereunder  are subject to  adjustment  from time to time as
follows:

                  (a) MERGER,  SALE OF ASSETS,  ETC. If at any time,  while this
Warrant, or any portion thereof, is outstanding and unexpired there shall be (i)
a  reorganization  (other  than  a  combination,  reclassification  exchange  or
subdivision  of  shares  otherwise  provided  for  herein),  (ii)  a  merger  or
consolidation  of the  Company  with or into  another  corporation  in which the
Company is not the surviving person, or a reverse triangular merger in which the
Company is the surviving  person but the shares of the  Company's  capital stock
outstanding  immediately  prior to the  merger  are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  cash,  securities  or
otherwise,  or (iii) a sale or transfer of the Company's  properties  and assets
as, or  substantially  as, an entirety to any other  person,  then, as a part of
such reorganization,  merger, consolidation,  sale or transfer, lawful provision
shall be made so that the Holder  shall  thereafter  be entitled to receive upon
exercise of this Warrant, during the period specified herein and upon payment of
the  exercise  price  then in  effect,  the  number  of shares of stock or other
securities  or  property  of  the  successor  corporation  resulting  from  such
reorganization,  merger,  consolidation,  sale or transfer which a holder of the
shares  deliverable  upon  exercise of this Warrant  would have been entitled to
receive in such reorganization,  consolidation, merger, sale or transfer if this
Warrant  had been  exercised  immediately  before such  reorganization,  merger,
consolidation,  sale or transfer,  all subject to further adjustment as provided
in this  Section  12. The  foregoing  provisions  of this  subsection  (a) shall
similarly apply to successive  reorganizations,  consolidations,  mergers, sales
and transfers and to the stock or securities of any other  corporation which are
at the time  receivable  upon the  exercise  of this  Warrant.  If the per share
consideration  payable  to the Holder  for  shares in  connection  with any such
transaction  is in a form other  than cash or  marketable  securities,  then the
value of such  consideration  shall be determined in good faith by the Company's
Board of  Directors,  whose  determination  shall be final and  binding.  In all
events,  appropriate  adjustment  (as  determined in good faith by the Company's
Board of Directors)  shall be made in the  application of the provisions of this
Warrant  with  respect  to the  rights and  interests  of the  Holder  after the
transaction,  to the end that the provisions of this Warrant shall be applicable
after that event,  as nearly as reasonably  may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant.

                  (b)  RECLASSIFICATION,  ETC.  If the Company at any time while
this Warrant,  or any portion thereof,  remains outstanding and unexpired shall,
by reclassification of securities or otherwise,  change any of the securities as
to which  purchase  rights under this Warrant exist into the same or a different
number  of  securities  of any  other  class  or  classes,  this  Warrant  shall
thereafter  represent the right to acquire such number and kind of securities as
would  have been  issuable  as the  result of such  change  with  respect to the
securities which were subject to the



                                      - 5 -

<PAGE>


purchase rights under this Warrant immediately prior to such reclassification or
other change and the exercise price therefor  shall be  appropriately  adjusted,
all subject to further adjustment as provided in this Section 12.

                  (c)  SPLIT,  SUBDIVISION  OR  COMBINATION  OF  SHARES.  If the
Company  at any  time  while  this  Warrant,  or any  portion  thereof,  remains
outstanding and unexpired shall split, subdivide or combine the securities as to
which  purchase  rights under this  Warrant  exist,  into a different  number of
securities of the same class,  the exercise price for such  securities  shall be
proportionately   decreased   in  the  case  of  a  split  or   subdivision   or
proportionately increased in the case of a combination.

                  (d) ADJUSTMENTS FOR DIVIDENDS IN STOCK OR OTHER  SECURITIES OR
PROPERTY. If while this Warrant, or any portion thereof, remains outstanding and
unexpired the holders of the securities as to which  purchase  rights under this
Warrant exist at the time shall have  received,  or, on or after the record date
fixed for the determination of eligible stockholders, shall have become entitled
to  receive,  without  payment  therefor,  other  or  additional  stock or other
securities or property (other than cash) of the Company by way of dividend, then
and in each case, this Warrant shall represent the right to acquire, in addition
to the  number  of shares  of the  security  receivable  upon  exercise  of this
Warrant,  and without  payment of any  additional  consideration  therefor,  the
amount of such other or additional  stock or other securities or property (other
than  cash) of the  Company  which  such  holder  would hold on the date of such
exercise  had it been the  holder  of  record of the  security  receivable  upon
exercise  of this  Warrant  on the date  hereof and had  thereafter,  during the
period from the date hereof to and including the date of such exercise, retained
such shares  and/or all other  additional  stock  available  by it as  aforesaid
during such  period,  giving  effect to all  adjustments  called for during such
period by the provisions of this Section 12.

                  (e) CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment  or  readjustment  pursuant  to this  Section  12, the Company at its
expense shall promptly  compute such  adjustment or  readjustment  in accordance
with the terms  hereof and furnish to each Holder a  certificate  setting  forth
such adjustment or readjustment  and showing in detail the facts upon which such
adjustment  or  readjustment  is based.  The  Company  shall,  upon the  written
request,  at any time,  of any such Holder,  furnish or cause to be furnished to
such  Holder  a  like  certificate  setting  forth:  (i)  such  adjustments  and
readjustments;  (ii) the  exercise  price at the time in  effect;  and (iii) the
number of shares and the  amount,  if any, of other  property  which at the time
would be received upon the exercise of the Warrant.

                  (f) NO  IMPAIRMENT.  The Company  will not,  by any  voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
to be observed or performed  hereunder by the Company,  but will at all times in
good faith assist in the carrying out of all the  provisions  of this Section 12
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holders against impairment.

         13. REGISTRATION  RIGHTS.  Pursuant to the terms and provisions of that
certain  Registration  Rights  Agreement dated as of even date herewith,  by and
between the Company and




                                      - 6 -

<PAGE>


the Holder (the "RIGHTS  AGREEMENT"),  the Holder of this Warrant is entitled to
certain  registration  rights  with  respect  to  the  shares  of  Common  Stock
underlying this Warrant.

         14.  "CALL"  BY THE  COMPANY.  The  Warrants  are  subject  to call and
cancellation  by the  Company  at its  option at any time  prior to the  Warrant
Expiration Date if:

                  (a) the closing sale price of the Company's  Common Stock,  if
listed on the American Stock Exchange or some other national exchange, or if not
listed on a national  exchange,  then the  closing bid  quotation  of the Common
Stock as reported on NASDAQ, if listed thereon,  or if not, some other reporting
system that  provides  last sale prices,  shall have for a period of twenty (20)
consecutive days on which such market is open for trading (each a "Trading Day")
ending on the day prior to the date on which the  Company  gives the Call Notice
(as such term is  hereinafter  defined)  equaled or exceeded $2.00 (as equitably
adjusted to reflect the occurrence if any of the events  described in Section 12
hereof); and

                  (b) either:  (i) the  Company has on file with the  Securities
and  Exchange  Commission  (the  "COMMISSION")  a fully  effective  registration
statement  under the Act  covering  all  shares of Common  Stock  issuable  upon
exercise of the outstanding Common Stock Warrants,  or (ii) the shares of Common
Stock  issuable upon exercise of the  outstanding  Common Stock  Warrants may be
sold  without  any  restriction  pursuant  to the  rules  of the  Commission  as
determined by the counsel to the Company pursuant to a written opinion letter.

Notice of the Company's  exercise of its call (the "Call Notice") shall be given
by the Company to the Holder in writing not less than twenty (20)  Trading  Days
before the date  fixed for call,  prior to which  fixed  date the  Holder  shall
maintain all of its rights hereunder. On and after the dated fixed for call, the
Holder shall have no rights with respect to outstanding  Warrants,  all of which
shall be canceled and, without more, shall be of no further force or effect.


         15.    MISCELLANEOUS PROVISIONS.

                  (a)  GOVERNING   LAW.  This  Warrant  has  been  executed  and
delivered  in the State of New Jersey and shall be governed by and  construed in
accordance  with the laws of the  State of New Jersey without  reference  to the
principles of conflicts of law thereof

                  (b) JURISDICTION.  The Company hereby irrevocably consents and
submits to, and the Holder,  by its acceptance of this Warrant,  likewise hereby
irrevocably  consents and submits to, the exclusive  jurisdiction  of the United
States  District  Court for the  District of New Jersey in  connection  with any
proceeding  arising out of or relating to this Warrant,  waives any objection to
venue in such  District  (unless such court lacks  jurisdiction  with respect to
such proceeding, in which case, the Company irrevocably consents and submits to,
and the Holder, by its acceptance of this Warrant, likewise irrevocably consents
and  submits  to, the  jurisdiction  of the Courts of the State of New Jersey in
connection  with such  proceeding and waives any objection to venue in the State
of New Jersey),  and agrees that service of any  summons,  complaint,  notice or
other process



                                      - 7 -

<PAGE>


relating to such  proceeding  may be effected in the manner  provided by Section
10(g) of the Rights Agreement.

                  (c)  ATTORNEYS'  FEES.  If any  action  at law or in equity is
necessary  to enforce or interpret  the terms of this  Warrant,  the  prevailing
party shall be entitled to reasonable  attorneys' fees, costs and disbursements,
in addition to any other relief to which such party may be entitled.

                  IN WITNESS WHEREOF,  the Company has caused this Warrant to be
signed in its corporate name by a duly authorized  officer and to be dated as of
the day and year written below.

Dated as of August___, 1999

Total No. of Shares:______

                                         DATAMETRICS CORPORATION


                                         By:____________________________________
                                            Name: Daniel P. Ginns
                                            Title: Chairman and CEO




                                      - 8 -

<PAGE>


                               NOTICE OF EXERCISE



To:      DATAMETRICS CORPORATION
         25B Hanover Road
         Suite 3305
         Florham Park, NJ 07932




         (1) The  undersigned  hereby  elects to purchase  __________  shares of
Common Stock of DATAMETRICS  CORPORATION,  pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price for such shares.

         (2) In exercising  this Warrant,  the  undersigned  hereby confirms and
acknowledges  that the shares of Common Stock are being acquired  solely for the
account of the  undersigned  and not as a nominee for any other  party,  and for
investment,  and that the undersigned will not offer,  sell or otherwise dispose
of any such shares of Common  Stock,  except under  circumstances  that will not
result in a violation of the United States  Securities  Act of 1933, as amended,
or any foreign or state securities laws.

         (3) Please issue a certificate or certificates representing said shares
of  Common  Stock in the name of the  undersigned  or in such  other  name as is
specified below:

         (4)  Please  issue a new  Warrant  for the  unexercised  portion of the
attached  Warrant  in the name of the  undersigned  or in such  other name as is
specified below:




____________________                          __________________________________
Date:                                         Name:





                                      - 9 -




                          REGISTRATION RIGHTS AGREEMENT

                  This Registration  Rights Agreement (this "Agreement") is made
and entered into as of July ___, 1999, among Datametrics Corporation, a Delaware
corporation (the "Company"),  and the entities or individuals listed on Schedule
A attached  hereto  "Subscribers").  This  Agreement  is being  entered  into in
connection  with  that  certain  12%  Subordinated   Convertible   Secured  Note
Subscription  Agreement,  dated of even date herewith,  by and among the Company
and the Subscribers (the "Subscription Agreement") pursuant to which the Company
issued 12% Subordinated Convertible Secured Notes ("Notes") to the Subscribers.

         The Company and the Subscribers hereby agree as follows:

          1.  DEFINITIONS.  Capitalized  terms  used and not  otherwise  defined
herein shall have the meanings given such terms in the  Subscription  Agreement.
As used in  this  Agreement,  the  following  terms  shall  have  the  following
meanings:

                  "AFFILIATE"  means,  with  respect  to any  Person,  any other
         Person that  directly or  indirectly  controls or is  controlled  by or
         under  common  control  with  such  Person.  For the  purposes  of this
         definition,  "control," when used with respect to any Person, means the
         possession,  direct  or  indirect,  of the power to direct or cause the
         direction  of the  management  and  policies  of such  Person,  whether
         through the ownership of voting  securities,  by contract or otherwise;
         and the terms of  "affiliated,"  "controlling"  and  "controlled"  have
         meanings correlative to the foregoing.

                  "BANK  FINANCING"  means an  institutional  line of  credit or
         working capital loans of at least $1,500,000.

                  "BOARD" shall have the meaning set forth in Section 3(l).

                  "BUSINESS DAY" means any day except  Saturday,  Sunday and any
         day which shall be a legal  holiday in the state of New Jersey or a day
         on which banking  institutions in the state of New Jersey generally are
         authorized or required by law or other government actions to close.

                  "COMMISSION" means the Securities and Exchange Commission.

                  "COMMON  STOCK" means the Company's  Common  Stock,  par value
         $.01 per share.

                  "CONVERSION  SHARES"  means  the  shares of the  Common  Stock
         issuable upon the conversion of the Notes.

                  "EFFECTIVENESS  PERIOD"  shall have the  meaning  set forth in
         Section 2.

                  "EXCHANGE ACT" means the  Securities  Exchange Act of 1934, as
         amended.

                  "FILING  DATE" means the earlier of (i) the 30th day following
         the  Closing of any Bank  Financing  in excess of One  Million  Dollars
         ($1,000,000), or (ii) August 31, 1999.

                  "HOLDER" or "HOLDERS" means the holder or holders, as the case
         may be, from time to time of Registrable Securities.

                  "INDEMNIFIED  PARTY"  shall  have  the  meaning  set  forth in
         Section 5(c).

                  "INDEMNIFYING  PARTY"  shall  have the  meaning  set  forth in
         Section 5(c).



<PAGE>
                  "LOSSES" shall have the meaning set forth in Section 5(a).

                  "PERSON"  means an individual or a  corporation,  partnership,
         trust,  incorporated  or  unincorporated  association,  joint  venture,
         limited  liability  company,  joint stock  company,  government  (or an
         agency or political subdivision thereof) or other entity of any kind.

                  "PROCEEDING" means an action,  claim,  suit,  investigation or
         proceeding (including,  without limitation, an investigation or partial
         proceeding, such as a deposition), whether commenced or threatened.

                  "PROSPECTUS" means the prospectus included in the Registration
         Statement  (including,  without limitation,  a prospectus that includes
         any information  previously  omitted from a prospectus filed as part of
         an  effective   registration  statement  in  reliance  upon  Rule  430A
         promulgated  under the Securities  Act), as amended or  supplemented by
         any prospectus supplement, with respect to the terms of the offering of
         any portion of the Registrable  Securities  covered by the Registration
         Statement,  and all other amendments and supplements to the Prospectus,
         including post-effective  amendments,  and all material incorporated by
         reference in such Prospectus.

                  "REGISTRABLE SECURITIES" means (i) the Warrant Shares and (ii)
         the Conversion Shares. Notwithstanding anything herein contained to the
         contrary,  such  registered  shares of Common  Stock shall be allocated
         among the  Holders  pro rata based on the total  number of  Registrable
         Securities  issued or  issuable  as of each  date  that a  Registration
         Statement,  as  amended,  relating  to the  resale  of the  Registrable
         Securities  is declared  effective by the  Commission.  Notwithstanding
         anything  contained  herein to the  contrary,  if the actual  number of
         shares of Common Stock  issuable  upon  conversion  of the Notes or the
         exercise of the Warrants exceeds 100% of the number of shares of Common
         Stock  issuable  upon  conversion  of the Notes or the  exercise of the
         Warrants  based upon a computation as at the Closing Date or the Filing
         Date, the term "Registrable Securities" shall be deemed to include such
         additional shares of Common Stock.

                  "REGISTRATION STATEMENT" means the registration statements and
         any  additional  registration  statements  contemplated  by  Section 3,
         including (in each case) the Prospectus,  amendments and supplements to
         such   registration   statement  or  Prospectus,   including  pre-  and
         post-effective  amendments,  all  exhibits  thereto,  and all  material
         incorporated by reference in such registration statement.

                  "RULE  144"  means  Rule  144  promulgated  by the  Commission
         pursuant to the  Securities  Act, as such Rule may be amended from time
         to time,  or any similar rule or  regulation  hereafter  adopted by the
         Commission having substantially the same effect as such Rule.

                  "RULE  158"  means  Rule  158  promulgated  by the  Commission
         pursuant to the  Securities  Act, as such Rule may be amended from time
         to time,  or any similar rule or  regulation  hereafter  adopted by the
         Commission having substantially the same effect as such Rule.

                  "RULE  415"  means  Rule  415  promulgated  by the  Commission
         pursuant to the  Securities  Act, as such Rule may be amended from time
         to time,  or any similar rule or  regulation  hereafter  adopted by the
         Commission having substantially the same effect as such Rule.

                  "SECURITIES ACT" means the Securities Act of 1933, as amended.

                  "WARRANTS"  means  the  Warrants  to  purchase  shares  of the
         Company's  Common  Stock  issued in  connection  with the  Subscription
         Agreement.

                  "WARRANT  SHARES"  means the shares of Common  Stock  issuable
         upon the exercise of any of the Warrants.

                                      - 2 -
<PAGE>

         2.  REGISTRATION.  No later than the Filing  Date,  the  Company  shall
prepare and file with the  Commission  a  Registration  Statement  covering  all
Registrable Securities for an offering to be made on a continuous basis pursuant
to Rule 415. The Company  shall use its best  efforts to cause the  Registration
Statement  to be  declared  effective  under the  Securities  Act as promptly as
possible after the filing thereof,  but in any event prior to December 31, 1999,
and to  keep  such  Registration  Statement  continuously  effective  under  the
Securities  Act  until  such  date as is the  earlier  of (x) the date  when all
Registrable Securities covered by such Registration Statement have been sold, or
(y) the  date on  which  the  Registrable  Securities  may be sold  without  any
restriction  pursuant to Rule 144(k) as determined by the counsel to the Company
pursuant to a written opinion letter,  addressed to the Company's transfer agent
to such effect (the  "Effectiveness  Period").  In the event that a Registration
Statement  under the Securities Act covering all  Registrable  Securities is not
effective  by  December  31,  1999,  the  Company  shall pay to the  Holder,  in
immediately available funds, upon demand, as liquidated damages for such failure
and not as a penalty,  2% of the outstanding  principal amount of Note, for each
month after such date that such a Registration Statement is not fully effective,
until the earlier of the dates  described in clauses (x) or (y) above,  at which
time such liquidated damages shall cease. Any and all payments required pursuant
to this paragraph shall be payable only in cash.

         3.   REGISTRATION   PROCEDURES.   In  connection   with  the  Company's
registration obligations hereunder, the Company shall:

                  (a)  Prepare and file with the  Commission  on or prior to the
         Filing Date, a  Registration  Statement on a form  appropriate  for the
         purposes  hereof,  and  cause  the  Registration  Statement  to  become
         effective and remain effective as provided herein;  provided,  however,
         that not less than five (5)  Business  Days  prior to the filing of the
         Registration  Statement or any related  Prospectus  or any amendment or
         supplement  thereto  (including any document that would be incorporated
         therein by reference),  the Company shall, at the request of any Holder
         (i) furnish to the Holders copies of all such documents  proposed to be
         filed,  which  documents  (other than those  incorporated by reference)
         will be  subject  to the  review of such  Holders,  and (ii)  cause its
         officers  and  directors,  counsel  and  independent  certified  public
         accountants to respond to such inquiries as shall be necessary,  in the
         reasonable opinion of counsel to such Holders,  to conduct a reasonable
         investigation  within the meaning of the  Securities  Act.  The Company
         shall not file the Registration Statement or any such Prospectus or any
         amendments or supplements thereto to which the Holders of a majority of
         the Registrable  Securities shall  reasonably  object in writing within
         three (3) Business Days of their receipt thereof.

                  (b) (i) Prepare and file with the Commission such  amendments,
         including post-effective  amendments,  to the Registration Statement as
         may be  necessary  to  keep  the  Registration  Statement  continuously
         effective  as  to  the  applicable   Registrable   Securities  for  the
         Effectiveness  Period,  and prepare and file with the  Commission  such
         additional  Registration  Statements  in order to  register  for resale
         under the Securities Act all of the Registrable Securities;  (ii) cause
         the related  Prospectus to be amended or  supplemented  by any required
         Prospectus  supplement,  and as so  supplemented or amended to be filed
         pursuant  to Rule  424  (or  any  similar  provisions  then  in  force)
         promulgated  under the Securities  Act;  (iii) respond  promptly to any
         comments  received from the Commission with respect to the Registration
         Statement  or any  amendment  thereto;  and (iv) comply in all material
         respects with the provisions of the Securities Act and the Exchange Act
         with respect to the disposition of all Registrable  Securities  covered
         by  the  Registration   Statement  during  the  applicable   period  in
         accordance  with the  intended  methods of  disposition  by the Holders
         thereof  set forth in the  Registration  Statement  as so amended or in
         such Prospectus as so supplemented.

                  (c) Notify the Holders of  Registrable  Securities to be sold,
         and with respect to (i)(C) below,  the  Company's  transfer  agent,  as
         promptly as possible (and, in the case of (i)(A) below, not


                                      - 3 -
<PAGE>
         less  than  five  (5)  Business  Days  prior  to such  filing)  and (if
         requested by any such  Person)  confirm such notice in writing no later
         than one (1) Business Day following  the day:  (i)(A) when a Prospectus
         or  any  Prospectus  supplement  or  post-effective  amendment  to  the
         Registration Statement is proposed to be filed; and (B) with respect to
         the Registration  Statement or any post-effective  amendment,  when the
         same has become effective; (ii) of any request by the Commission or any
         other  Federal  or  state  governmental  authority  for  amendments  or
         supplements  to  the  Registration   Statement  or  Prospectus  or  for
         additional information;  (iii) of the issuance by the Commission of any
         stop order suspending the  effectiveness of the Registration  Statement
         covering any or all of the Registrable  Securities or the initiation of
         any  Proceedings  for  that  purpose;  (iv) if at any  time  any of the
         representations   and  warranties  of  the  Company  contained  in  any
         agreement  contemplated  hereby  ceases to be true and  correct  in all
         material   respects;   (v)  of  the  receipt  by  the  Company  of  any
         notification  with respect to the  suspension of the  qualification  or
         exemption from  qualification of any of the Registrable  Securities for
         sale in any  jurisdiction,  or the  initiation  or  threatening  of any
         Proceeding  for such purpose;  and (vi) of the  occurrence of any event
         that  makes  any  statement  made  in  the  Registration  Statement  or
         Prospectus or any document  incorporated  or deemed to be  incorporated
         therein by reference  untrue in any material  respect or that  requires
         any  revisions  to the  Registration  Statement,  Prospectus  or  other
         documents  so that,  in the case of the  Registration  Statement or the
         Prospectus,  as the  case  may  be,  it will  not  contain  any  untrue
         statement  of a  material  fact or  omit to  state  any  material  fact
         required  to be stated  therein  or  necessary  to make the  statements
         therein,  in the light of the circumstances under which they were made,
         not misleading;.

                  (d) Use its best  efforts  to avoid the  issuance  of,  or, if
         issued,  obtain  the  withdrawal  of,  (i)  any  order  suspending  the
         effectiveness of the Registration  Statement, or (ii) any suspension of
         the  qualification  (or  exemption  from  qualification)  of any of the
         Registrable  Securities for sale in any  jurisdiction,  at the earliest
         practicable moment.

                  (e) If  requested  by the Holders of a majority in interest of
         the Registrable  Securities,  (i) promptly  incorporate in a Prospectus
         supplement or  post-effective  amendment to the Registration  Statement
         such  information as the Company  reasonably  agrees should be included
         therein,  and  (ii)  make  all  required  filings  of  such  Prospectus
         supplement  or such  post-effective  amendment  as soon as  practicable
         after the  Company  has  received  notification  of the  matters  to be
         incorporated in such Prospectus supplement or post-effective amendment.

                  (f)  Furnish  to each  Holder  and upon  request  and  without
         charge, at least one conformed copy of each Registration  Statement and
         each amendment thereto,  including financial  statements and schedules,
         and  also,  to the  extent  requested  by such  person,  all  documents
         incorporated or deemed to be incorporated therein by reference, and all
         exhibits  to the  extent  requested  by such  Person  (including  those
         previously  furnished or incorporated by reference)  promptly after the
         filing of such documents with the Commission.

                  (g) Promptly deliver to each Holder,  without charge,  as many
         copies  of the  Prospectus  or  Prospectuses  (including  each  form of
         prospectus)  and each  amendment or supplement  thereto as such Persons
         may reasonably  request;  and the Company hereby consents to the use of
         such Prospectus and each amendment or supplement thereto by each of the
         selling  Holders  in  connection  with  the  offering  and  sale of the
         Registrable  Securities covered by such Prospectus and any amendment or
         supplement thereto.

                  (h) Prior to any public  offering of  Registrable  Securities,
         use its best  efforts to  register  or qualify  or  cooperate  with the
         selling  Holders in connection with the  registration or  qualification
         (or  exemption  from  such   registration  or  qualification)  of  such
         Registrable  Securities for offer and sale under the securities or Blue
         Sky laws of such  jurisdictions  within the United States as any Holder
         requests in writing,  to keep each such  registration or  qualification
         (or exemption therefrom) effective

                                      - 4 -
<PAGE>
         during  the  Effectiveness  Period  and to do any and all other acts or
         things  necessary  or  advisable  to  enable  the  disposition  in such
         jurisdictions of the Registrable  Securities  covered by a Registration
         Statement; PROVIDED, HOWEVER, that the Company shall not be required to
         qualify  generally to do business in any  jurisdiction  where it is not
         then so  qualified  or to take any  action  that  would  subject  it to
         general  service of process  in any such  jurisdiction  where it is not
         then so subject, or subject the Company to any material tax in any such
         jurisdiction where it is not then so subject.

                  (i)  Cooperate  with the  Holders  to  facilitate  the  timely
         preparation  and  delivery  of  certificates  representing  Registrable
         Securities  to be sold  pursuant  to a  Registration  Statement,  which
         certificates  shall be free of all restrictive  legends,  and to enable
         such Registrable  Securities to be in such denominations and registered
         in such names as any Holder may request at least two (2) Business  Days
         prior to any sale of  Registrable  Securities,  provided the Company is
         given five (5) Business Days' notice of such sale.

                  (j) Upon the  occurrence  of any event  described  in  Section
         3(c)(vi),  as promptly as possible,  prepare a supplement or amendment,
         including a post-effective  amendment, to the Registration Statement or
         a supplement to the related Prospectus or any document  incorporated or
         deemed to be  incorporated  therein  by  reference,  and file any other
         required  document  so  that,  as  thereafter  delivered,  neither  the
         Registration  Statement  nor such  Prospectus  will  contain  an untrue
         statement of a material  fact or omit to state a material fact required
         to be stated  therein or necessary to make the statements  therein,  in
         the  light  of the  circumstances  under  which  they  were  made,  not
         misleading.

                  (k) Comply in all material  respects with all applicable rules
         and regulations of the Commission.

                  Notwithstanding anything to the contrary herein contained, the
         Company shall be entitled to postpone,  for a reasonable period of time
         not  in  excess  of  120  days,  the  filing,   or  suspend  filing  or
         effectiveness,  of a Registration  Statement, or any amendment thereto,
         otherwise   required   pursuant  to  this   Agreement  if  the  Company
         determines,  in the good  faith  exercise  of its  reasonable  business
         judgment,  that (i) such  registration  and offering  would  materially
         interfere with bona fide financing  plans of the Company;  or (ii) such
         registration   and  offering  would  require   disclosure  of  material
         non-public  information regarding the Company which the Company's Board
         of  Directors  (the  "Board")  reasonably  determines  not to be in the
         Company's  best  interest  to  disclose  and which the  Company  is not
         otherwise required to disclose.

         4.       OBLIGATIONS OF HOLDERS.

                  (a) Each Holder covenants and agrees that (i) it will not sell
         any Registrable  Securities under the  Registration  Statement until it
         has received  copies of the Prospectus as then amended or  supplemented
         as  contemplated  in Section 3(g) and notice from the Company that such
         Registration  Statement and any post-effective  amendments thereto have
         become  effective as  contemplated  by Section 3(c) and (ii) it and its
         officers,  directors  or  Affiliates,  if any,  will  comply  with  the
         prospectus delivery requirements of the Securities Act as applicable to
         them in connection with sales of Registrable Securities pursuant to the
         Registration Statement.

                  (b) Each  Holder  agrees  by its  acquisition  of  Registrable
         Securities  that,  upon  receipt  of a notice  from the  Company of the
         occurrence  of any event of the kind  described  in  Section  3(c)(ii),
         3(c)(iii),  3(c)(iv),  3(c)(v) or 3(c)(vi),  such Holder will forthwith
         discontinue  disposition  of  such  Registrable  Securities  under  the
         Registration Statement until such Holder's receipt of the copies of the
         supplemented   Prospectus   and/or   amended   Registration   Statement
         contemplated  by Section 3(j), or until it is advised in writing by the
         Company that the use of the applicable Prospectus may be


                                      - 5 -
<PAGE>
         resumed,  and, in either case, has received copies of any additional or
         supplemental filings that are incorporated or deemed to be incorporated
         by reference in such Prospectus or Registration Statement.

                  (c) The Company may require each selling  Holder to furnish to
         the Company  information  regarding such Holder and the distribution of
         such  Registrable  Securities  as is required by law to be known by the
         Company and/or disclosed in the Registration Statement, and the Company
         may exclude from such  registration  the Registrable  Securities of any
         such Holder who unreasonably fails to furnish such information within a
         reasonable time after receiving such request.

         5.       INDEMNIFICATION

                  (a)  INDEMNIFICATION  BY  THE  COMPANY.   The  Company  shall,
         notwithstanding  any termination of this Agreement,  indemnify and hold
         harmless each Holder,  each Person who controls any such Holder (within
         the meaning of Section 15 of the  Securities  Act and/or  Section 20 of
         the  Exchange  Act)  and  the  officers,  directors,  agents,  brokers,
         investment  advisors  and  employees  of each of them,  to the  fullest
         extent  permitted  by  applicable  law,  from and  against  any and all
         losses,  claims,  damages,  liabilities,   costs  (including,   without
         limitation,  costs of  preparation  and  attorneys'  fees) and expenses
         (collectively,  "Losses"),  as incurred,  arising out of or relating to
         any untrue or alleged untrue  statement of a material fact contained in
         the Registration Statement, any Prospectus or any form of prospectus or
         in  any  amendment  or  supplement   thereto  or  in  any   preliminary
         prospectus,  or arising out of or  relating to any  omission or alleged
         omission of a material fact required to be stated  therein or necessary
         to make the  statements  therein (in the case of any Prospectus or form
         of prospectus or supplement  thereto, in the light of the circumstances
         under which they were made) not misleading,  except to the extent,  but
         only to the extent,  that such untrue statements or omissions are based
         solely upon  information  regarding such Holder furnished in writing to
         the Company by such Holder expressly for use therein, which information
         was  reasonably  relied on by the  Company  for use  therein  or to the
         extent that such  information  relates to such Holder or such  Holder's
         proposed  method of  distribution  of  Registrable  Securities  and was
         reviewed and expressly approved in writing by such Holder expressly for
         use in the  Registration  Statement,  such  Prospectus  or such form of
         Prospectus or in any amendment or supplement thereto. The Company shall
         notify the Holders promptly of the institution,  threat or assertion of
         any  Proceeding  of which the Company is aware in  connection  with the
         transactions  contemplated  by this  Agreement.  Such  indemnity  shall
         remain in full force and effect regardless of any investigation made by
         or on behalf of an Indemnified  Party and shall survive the transfer of
         the Registrable Securities by the Holders.

                  (b) INDEMNIFICATION BY HOLDERS.  Each Holder shall,  severally
         and not jointly,  indemnify and hold harmless the Company,  each Person
         who  controls  the  Company  (within  the  meaning of Section 15 of the
         Securities  Act  and/or  Section  20 of  the  Exchange  Act),  and  the
         directors,  officers,  agents or  employees  of each of the Company and
         such controlling Persons, to the fullest extent permitted by applicable
         law, from and against all Losses, as incurred, arising solely out of or
         based solely upon any untrue  statement of a material fact contained in
         the Registration Statement, any Prospectus,  or any form of prospectus,
         or  arising  solely  out of or  based  solely  upon any  omission  of a
         material  fact  required to be stated  therein or necessary to make the
         statements therein (in the case of any Prospectus or form of prospectus
         or supplement  thereto,  in the light of the circumstances  under which
         they were made) not misleading,  to the extent, but only to the extent,
         that such untrue  statement or omission is contained in any information
         so furnished in writing by such Holder to the Company  specifically for
         inclusion in the  Registration  Statement or such  Prospectus  and that
         such  information was reasonably  relied upon by the Company for use in
         the Registration Statement,  such Prospectus or such form of prospectus
         or to the extent that such  information  relates to such Holder or such
         Holder's proposed method of distribution of Registrable  Securities and
         was reviewed and expressly approved in writing by such Holder expressly
         for use in the Registration Statement,  such Prospectus or such form of
         Prospectus.  Notwithstanding anything to the contrary contained herein,
         the Holder

                                      - 6 -
<PAGE>
         shall be liable  under this  Section  5(b) for only that amount as does
         not exceed the net  proceeds  to such Holder as a result of the sale of
         Registrable Securities pursuant to such Registration Statement.

                  (c)  CONDUCT  OF  INDEMNIFICATION   PROCEEDINGS.  (i)  If  any
         Proceeding  shall be brought or asserted against any Person entitled to
         indemnity  hereunder (an "INDEMNIFIED  PARTY"),  such Indemnified Party
         promptly  shall  notify the Person from whom  indemnity  is sought (the
         "INDEMNIFYING  PARTY) in  writing,  and the  Indemnifying  Party  shall
         assume  the  defense  thereof,  including  the  employment  of  counsel
         reasonably satisfactory to the Indemnified Party and the payment of all
         fees  and  expenses   incurred  in  connection  with  defense  thereof;
         provided, that the failure of any Indemnified Party to give such notice
         shall  not  relieve  the  Indemnifying  Party  of  its  obligations  or
         liabilities pursuant to this Agreement, except (and only) to the extent
         that  it  shall  be  finally   determined   by  a  court  of  competent
         jurisdiction  (which  determination is not subject to appeal or further
         review)  that  such  failure  shall  have  proximately  and  materially
         adversely prejudiced the Indemnifying Party.

                  (ii) An  Indemnified  Party  shall  have the  right to  employ
         separate  counsel  in any such  Proceeding  and to  participate  in the
         defense thereof,  but the fees and expenses of such counsel shall be at
         the  expense  of such  Indemnified  Party or  Parties  unless:  (A) the
         Indemnifying Party has agreed in writing to pay such fees and expenses;
         or (B) the Indemnifying  Party shall have failed promptly to assume the
         defense  of  such   Proceeding   and  to  employ   counsel   reasonably
         satisfactory to such Indemnified  Party in any such Proceeding;  or (C)
         the named  parties  to any such  Proceeding  (including  any  impleaded
         parties)  include  both such  Indemnified  Party  and the  Indemnifying
         Party,  and such  Indemnified  Party shall have been advised by counsel
         that a conflict of interest is likely to exist if the same counsel were
         to represent  such  Indemnified  Party and the  Indemnifying  Party (in
         which case, if such Indemnified  Party notifies the Indemnifying  Party
         in writing that it elects to employ separate  counsel at the expense of
         the Indemnifying Party, the Indemnifying Party shall not have the right
         to assume the defense  thereof and such counsel shall be at the expense
         of the Indemnifying  Party). The Indemnifying Party shall not be liable
         for any settlement of any such Proceeding  effected without its written
         consent,   which  consent  shall  not  be  unreasonably   withheld.  No
         Indemnifying  Party  shall,  without the prior  written  consent of the
         Indemnified  Party,  effect any settlement of any pending Proceeding in
         respect  of  which  any  Indemnified  Party  is a  party,  unless  such
         settlement includes an unconditional  release of such Indemnified Party
         from all  liability  on  claims  that are the  subject  matter  of such
         Proceeding.

                  (iii)  All  fees  and  expenses  of  the   Indemnified   Party
         (including  reasonable  fees and  expenses  to the extent  incurred  in
         connection with investigating or preparing to defend such Proceeding in
         a manner  not  inconsistent  with  this  Section)  shall be paid to the
         Indemnified  Party,  as  incurred,  within  ten (10)  Business  Days of
         written notice thereof to the Indemnifying Party (regardless of whether
         it is ultimately  determined that an Indemnified  Party is not entitled
         to indemnification hereunder; provided, that the Indemnifying Party may
         require such Indemnified  Party to undertake to reimburse all such fees
         and  expenses to the extent it is finally  judicially  determined  that
         such Indemnified Party is not entitled to indemnification hereunder).

                  (d) CONTRIBUTION. If a claim for indemnification under Section
         5(a)  or 5(b) is  unavailable  to an  Indemnified  Party  because  of a
         failure  or  refusal  of  a  governmental  authority  to  enforce  such
         indemnification  in  accordance  with its  terms  (by  reason of public
         policy  or  otherwise),  then  each  Indemnifying  Party,  in  lieu  of
         indemnifying  such  Indemnified  Party,  shall contribute to the amount
         paid or payable by such  Indemnified  Party as a result of such Losses,
         in such  proportion as is  appropriate to reflect the relative fault of
         the  Indemnifying  Party and  Indemnified  Party in connection with the
         actions,  statements or omissions  that resulted in such Losses as well
         as any other relevant equitable  considerations.  The relative fault of
         such  Indemnifying  Party and Indemnified  Party shall be determined by
         reference  to,  among other  things,  whether  any action in  question,
         including any

                                      - 7 -
<PAGE>
         untrue or alleged  untrue  statement of a material  fact or omission or
         alleged  omission  of a  material  fact,  has been taken or made by, or
         relates  to  information   supplied  by,  such  Indemnifying  Party  or
         Indemnified Party, and the parties' relative intent, knowledge,  access
         to  information  and  opportunity  to correct or prevent  such  action,
         statement  or  omission.  The  amount  paid or  payable by a party as a
         result  of any  Losses  shall be  deemed  to  include,  subject  to the
         limitations  set forth in Section 5(c),  any  reasonable  attorneys' or
         other reasonable fees or expenses  incurred by such party in connection
         with  any   Proceeding  to  the  extent  such  party  would  have  been
         indemnified for such fees or expenses if the  indemnification  provided
         for in this Section was available to such party in accordance  with its
         terms. The parties hereto agree that it would not be just and equitable
         if  contribution  pursuant to this Section 5(d) were  determined by pro
         rata allocation or by any other method of allocation that does not take
         into  account  the   equitable   considerations   referred  to  in  the
         immediately  preceding  paragraph.   No  Person  guilty  of  fraudulent
         misrepresentation   (within  the  meaning  of  Section   11(f)  of  the
         Securities Act) shall be entitled to  contribution  from any Person who
         was not guilty of such fraudulent misrepresentation.

                  The indemnity and  contribution  agreements  contained in this
         Section are in addition to any liability that the Indemnifying  Parties
         may have to the Indemnified Parties

         6.  RULE  144.  As  long as any  Holder  owns  any  Note,  Warrants  or
Registrable  Securities,  the Company shall timely file (or obtain extensions in
respect  thereof  and file  within the  applicable  grace  period)  all  reports
required  to be filed by the Company  after the date hereof  pursuant to Section
13(a) or 15(d) of the  Exchange  Act,  and furnish the Holders upon request with
true and  complete  copies of all such  filings.  As long as any Holder owns any
Note, Warrants or Registrable Securities, if the Company is not required to file
reports  pursuant to Section 13(a) or 15(d) of the Exchange Act, it will prepare
and  furnish  to  the  applicable   Holders  and  make  publicly  available  the
information required by Rule 144(c)(2) promulgated under the Securities Act. The
Company  further  will take such  further  action as any Holder  may  reasonably
request,  all to the extent  required from time to time to enable such Person to
sell  Conversion  Shares  and  Warrant  Shares  without  registration  under the
Securities  Act within the  limitation  of the  exemptions  provided by Rule 144
promulgated  under the Securities  Act,  including  providing any legal opinions
referred to in the Purchase Agreement.

         7.  REGISTRATION  EXPENSES.  All  fees  and  expenses  incident  to the
performance  of or compliance  with this Agreement by the Company shall be borne
by the Company  whether or not the  Registration  Statement  is filed or becomes
effective and whether or not any Registrable Securities are sold pursuant to the
Registration  Statement.  The fees and  expenses  referred  to in the  foregoing
sentence shall include, without limitation, (i) all registration and filing fees
(including,  without  limitation,  fees and expenses (A) with respect to filings
required to be made with the American  Stock  Exchange and any other  securities
exchange or market on which Registrable  Securities are required hereunder to be
listed, (B) with respect to filings required to be made with the Commission, and
(C) in compliance  with state  securities or Blue Sky laws  (including,  without
limitation, fees and disbursements of counsel for the Holders in connection with
Blue Sky  qualifications of the Registrable  Securities and determination of the
eligibility of the Registrable  Securities for investment under the laws of such
jurisdictions  as the  Holders  of a  majority  of  Registrable  Securities  may
designate)), (ii) printing expenses (including, without limitation,  expenses of
printing certificates for Registrable Securities and of printing prospectuses if
the  printing of  prospectuses  is requested by the holders of a majority of the
Registrable Securities included in the Registration Statement), (iii) messenger,
telephone and delivery expenses, (iv) Securities Act liability insurance, if the
Company  so  desires  such  insurance,  and (v) fees and  expenses  of all other
Persons  retained  by the Company in  connection  with the  consummation  of the
transactions contemplated by this Agreement,  including, without limitation, the
Company's independent public accountants  (including the expenses of any comfort
letters or costs associated with the delivery by independent  public accountants
of a comfort  letter or comfort  letters).  In  addition,  the Company  shall be
responsible  for all of its internal  expenses  incurred in connection  with the
consummation  of the  transactions  contemplated  by this Agreement  (including,
without  limitation,  all salaries  and  expenses of its officers and  employees
performing  legal or accounting  duties),  the expense of any annual audit,  the
fees and expenses  incurred in  connection  with the listing of the  Registrable
Securities on any securities exchange as required hereunder.

                                      - 8 -
<PAGE>
         8.       MISCELLANEOUS.

                  (a) REMEDIES.  In the event of a breach by the Company or by a
         Holder, of any of their  obligations under this Agreement,  each Holder
         or the  Company,  as the case may be, in addition to being  entitled to
         exercise all rights granted by law and under this Agreement,  including
         recovery of damages,  will be entitled to specific  performance  of its
         rights  under this  Agreement.  The Company and each Holder  agree that
         monetary damages would not provide adequate compensation for any losses
         incurred by reason of a breach by it of any of the  provisions  of this
         Agreement  and hereby  further  agrees that, in the event of any action
         for specific  performance in respect of such breach, it shall waive the
         defense that a remedy at law would be adequate.

                  (b) NO INCONSISTENT AGREEMENTS. Neither the Company nor any of
         its subsidiaries  has, as of the date hereof entered into and currently
         in  effect,  nor shall the  Company or any of its  subsidiaries,  on or
         after the date of this Agreement, enter into any agreement with respect
         to its securities that is  inconsistent  with the rights granted to the
         Holders in this  Agreement or otherwise  conflicts  with the provisions
         hereof.  Without limiting the generality of the foregoing,  without the
         written  consent of the Holders of a majority  of the then  outstanding
         Registrable  Securities,  the Company shall not grant to any Person the
         right to request the Company to register any  securities of the Company
         under the  Securities  Act unless the rights so granted  are subject in
         all  respects  to the  prior  rights in full of the  Holders  set forth
         herein,  and are not otherwise in conflict with the  provisions of this
         Agreement,  or the  Registration  Rights  Agreement  has been  declared
         effective by the SEC.

                  (c)  GOVERNING   LAW/JURISDICTION.   This  Agreement  will  be
         construed and enforced in  accordance  with and governed by the laws of
         the State of New  Jersey,  except for  matters  arising  under the Act,
         without  reference  to  principles  of  conflicts  of law.  Each of the
         parties  consents to the  jurisdiction of the US District Court for the
         State of New Jersey in connection  with any dispute  arising under this
         Agreement and hereby waives,  to the maximum  extent  permitted by law,
         any objection,  including any objection  based on forum non conveniens,
         to the bringing of any such proceeding in such jurisdiction. Each party
         hereby  agrees  that if  another  party  to this  Agreement  obtains  a
         judgment against it in such a proceeding, the party which obtained such
         judgment  may  enforce  same by summary  judgment  in the courts of any
         state or country having  jurisdiction  over the party against whom such
         judgment  was  obtained,  and each party hereby  waives,  to the extent
         permitted  by law,  any  defenses  available  to it under local law and
         agrees  to the  enforcement  of such a  judgment.  Each  party  to this
         Agreement  irrevocably  consents  to the service of process in any such
         proceeding by the mailing of copies  thereof by registered or certified
         mail,  postage prepaid,  to such party at its address set forth herein.
         Nothing  herein shall affect the right of any party to serve process in
         any other manner permitted by law.

                  (d) AMENDMENTS AND WAIVERS.  The provisions of this Agreement,
         including the provisions of this sentence, may not be amended, modified
         or  supplemented,  and  waivers  or  consents  to  departures  from the
         provisions hereof may not be given, unless the same shall be in writing
         and signed by the Company and each of the Holders.  Notwithstanding the
         foregoing,  a waiver or consent to depart  from the  provisions  hereof
         with  respect to a matter  that  relates  exclusively  to the rights of
         Holders and that does not directly or  indirectly  affect the rights of
         other  Holders  may be given by Holders  of at least a majority  of the
         Registrable  Securities  to  which  such  waiver  or  consent  relates;
         provided,  however,  that the  provisions  of this  sentence may not be
         amended,  modified,  or  supplemented  except  in  accordance  with the
         provisions of the immediately preceding sentence.

                  (e)  NOTICES.  All  notices,  demands,   requests,   consents,
         approvals,  and other  communications  required or permitted  hereunder
         shall be in writing and, unless otherwise specified

                                      - 9 -
<PAGE>
         herein,  shall be (i)  personally  served,  (ii) deposited in the mail,
         registered or certified,  return receipt  requested,  postage  prepaid,
         (iii) delivered by reputable air courier service with charges  prepaid,
         or (iv) transmitted by hand delivery, telegram, or facsimile, addressed
         as set forth below or to such other address or facsimile number as such
         party shall have  specified  most  recently  in writing.  Any notice or
         other  communication  required or permitted to be given hereunder shall
         be deemed  effective  (a) upon hand  delivery or delivery by facsimile,
         with  accurate  confirmation  generated by the  transmitting  facsimile
         machine,  at the address or number  designated below (if delivered on a
         business day during  normal  business  hours where such notice is to be
         received),  or the first  business  day  following  such  delivery  (if
         delivered  other than on a business day during  normal  business  hours
         where such notice is to be  received),  (b) on the second  business day
         following  the date of  mailing by  reputable  courier  service,  fully
         prepaid,  addressed  to such  address,  or upon actual  receipt of such
         mailing,  whichever  shall first occur or (c) on the fifth business day
         following  date of mailing by  registered  or  certified  mail,  return
         receipt requested,  postage prepaid, addressed to such address, or upon
         actual  receipt of such  mailing,  whichever  shall  first  occur.  The
         addresses for such communications shall be:

    (i)   If to the Company: to                 With a copy to:

          Datametrics Corporation               Lane Altman & Owens LLP
          25B Hanover Road No. 3305             101 Federal Street
          Florham Park, NJ 07932                Boston, MA 02110
          Attn:  Daniel P. Ginns, CEO           Attn:   Joseph F. Mazzella, Esq.
          Telephone: (973) 377-3900             Telephone: (617) 345-9800
          Facsimile:  (973) 377-5736            Facsimile:  (617) 345-0400

           and

                  (ii)     If to the Subscriber(s), at the addresses and numbers
                           set forth  beside its name  below,  unless  otherwise
                           listed on Schedule A annexed hereto.

                  (f)  SuCCESSORS AND ASSIGNS.  This Agreement  shall be binding
         upon and inure to the benefit of the parties and their  successors  and
         permitted assigns and shall inure to the benefit of each Holder and its
         successors  and assigns.  The Company may not assign this  Agreement or
         any of its rights or  obligations  hereunder  without the prior written
         consent of each Holder.

                  (g)  ASSIGNMENT  OF  REGISTRATION  RIGHTS.  The rights of each
         Holder hereunder,  including the right to have the Company register for
         resale  Registrable  Securities  in  accordance  with the terms of this
         Agreement,  shall be  automatically  assignable  by each  Holder to any
         transferee  of such  Holder of all or a portion of the shares of Common
         Stock or the  Registrable  Securities  if:  (i) the  Holder  agrees  in
         writing with the  transferee  or assignee to assign such rights,  and a
         copy of such  agreement is furnished to the Company within a reasonable
         time after such  assignment,  (ii) the Company is,  within a reasonable
         time after such transfer or  assignment,  furnished with written notice
         of (a) the name and address of such transferee or assignee, and (b) the
         securities  with  respect to which such  registration  rights are being
         transferred  or assigned,  (iii)  following such transfer or assignment
         the  further  disposition  of  such  securities  by the  transferee  or
         assignees is restricted  under the Securities Act and applicable  state
         securities  laws,  (iv) at or before the time the Company  receives the
         written  notice  contemplated  by  clause  (ii)  of this  Section,  the
         transferee  or assignee  agrees in writing with the Company to be bound
         by all of the provisions of this Agreement, and (v) such transfer shall
         have been made in accordance  with the applicable  requirements  of the
         Purchase  Agreement.  In addition,  each Holder shall have the right to
         assign its rights  hereunder to any other Person with the prior written
         consent  of the  Company,  which  consent  shall  not  be  unreasonably
         withheld.  The rights to assignment  shall apply to the Holders (and to
         subsequent) successors and assigns.

                                     - 10 -
<PAGE>
                  (h)   FACSIMILE/COUNTERPARTS/ENTIRE   AGREEMENT.   Except   as
         otherwise  stated  herein,  in  lieu  of  the  original,   a  facsimile
         transmission  or  copy  of  the  original  shall  be as  effective  and
         enforceable  as  the  original.  This  Agreement  may  be  executed  in
         counterparts  which shall be considered an original  document and which
         together  shall be considered a complete  document.  This Agreement and
         the  Schedules and Exhibits  hereto,  constitute  the entire  agreement
         between  each  Subscriber  and the Company  with respect to the subject
         matter hereof.

                  (i)  SEVERABILITY.  In the event  that any  provision  of this
         Agreement  becomes or is declared by a court of competent  jurisdiction
         to be illegal,  unenforceable or void, this Agreement shall continue in
         full force and effect  without said  provision;  provided  that no such
         severability  shall be effective if it materially  changes the economic
         benefit of this Agreement to any party.

                  (j) HEADINGS. The headings herein are for convenience only, do
         not  constitute  a part of this  Agreement  and  shall not be deemed to
         limit or affect any of the provisions hereof.

         IN WITNESS  WHEREOF,  the parties hereto have caused this  Registration
Rights Agreement to be duly executed by their respective  authorized  persons as
of the date first indicated above.


                             DATAMETRICS CORPORATION

                                            By:_________________________________
                                                     Name: Daniel P. Ginns
                                                     Title:   CEO


                                            SUBSCRIBER:_________________________


                                            By:_________________________________
                                                     Name:
                                                     Title:


                                            By:_________________________________
                                                     Name:
                                                     Title:

                                            Address:____________________________
                                                    No. and Street

                                                    ____________________________
                                                     City (Town), State and Zip

                                                    ____________________________
                                                    Telephone

                                                    ____________________________
                                                    Facsimile Telephone Number


                                     - 11 -



                               SECURITY AGREEMENT


         THIS SECURITY  AGREEMENT  dated as of July __, 1999 (as the same may be
supplemented,  modified,  amended  or  restated  from time to time in the manner
provided herein,  this  "Agreement"),  by and among DATAMETRICS  CORPORATION,  a
Delaware  corporation  having its chief  executive  office at 25B Hanover  Road,
Suite 3305,  Florham Park, New Jersey 07932 (the "Debtor");  Bruce Galloway,  an
individual  with an  address  of c/o  Burnham  Securities,  1325  Avenue  of the
Americas,  17th Floor,  New York, NY 10105 as Agent (the "Secured  Party Agent")
for certain parties  described as "Subscribers" in that certain 12% Subordinated
Convertible  Secured  Note  Subscription  Agreement(s)  of  even  date  herewith
(collectively,  the "Subscription  Agreement")  between the Debtor,  the Secured
Party; and such Subscribers ("Holders").  Any capitalized terms not specifically
defined herein shall have the meaning assigned to such terms in the Subscription
Agreement and the documents and instruments related thereto.

                                   WITNESSETH:

         WHEREAS,   pursuant  to  the  Subscription  Agreement,  the  Debtor  is
concurrently  herewith  issuing  to  each  of  the  Holders  a 12%  Subordinated
Convertible  Secured  Note  (the  "Notes")  in  the  amount  set  forth  in  the
Subscription  Agreement,  pursuant  to which the Debtor  promises  to pay to the
Holders  thereof,  the  principal  amount  thereof,  together  with all  accrued
interest thereon, secured by a security interest in the Collateral (as such term
is hereinafter defined) in favor of the Holders and the Secured Party Agent;

         WHEREAS,  the security interests of the Holders rank pari passu to each
other; and

         WHEREAS,  each of the Holder and the Debtor  desire  that the  security
interest in the Collateral  granted in favor of the respective  Holders shall be
subordinate to the rights of any holders of any Senior Debt in the Collateral.

         WHEREAS,  each of the  Holders  does hereby  appoint the Secured  Party
Agent as its agent and attorney in fact to hold,  and act on behalf of him, her,
it with respect to, the security interests and rights granted hereunder.

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants and agreement  hereinafter set forth,  the parties hereto hereby agree
as follows:

         SECTION 1.  DEFINITIONS.  All  capitalized  terms  used  herein and not
defend  herein  shall have the  meaning  given  such term in the Notes.  As used
herein, the following words shall have the following meanings:

         (a)  "ACCOUNT(S)":  Any and all rights of Debtor to  payment  for goods
         sold or leased or for services  rendered at the Property;  all accounts
         receivable of Debtor;  all obligations owing to Debtor and evidenced by
         an instrument or chattel paper; all rights of Debtor to


<PAGE>
         payment under contracts not yet earned by performance and not evidenced
         by an instrument or chattel  paper;  any and all  obligations  owing to
         Debtor  of  any  kind  or  nature,  including  all  writings,  if  any,
         evidencing the same, including all instruments, drafts, acceptances and
         chattel  paper;  and all  proceeds  of any of the  foregoing.  There is
         further  included  within  the term  "Accounts"  all  right,  title and
         interest  of  Debtor  in and to the  Inventory  which  gave rise to any
         Account (including the right of stoppage in transit) all guaranties of,
         and security  and liens with  respect to any Account,  and all accounts
         and  documents  of Debtor as those  terms are  defined  in the  Uniform
         Commercial  Code.  The term  "Accounts"  shall also  include any of the
         foregoing types of property related to the Property in which the Debtor
         has any interest.

         (b) "ACCOUNT DEBTOR": Any person, firm, corporation or other entity who
         is obligated to the Debtor on an Account.

         (c) "COLLATERAL":  All present and future right,  title and interest of
         Debtor   in  all   Accounts,   Inventory,   Equipment   and   Leasehold
         Improvements,  General  Intangibles  and all of Debtor's other real and
         personal  property of every kind and nature  located in or on, or used,
         or intended to be used in connection with,  related to or incidental to
         the Debtor's  business,  whether now  existing or hereafter  arising or
         acquired,  and wherever located and all proceeds and products  thereof,
         including  without  limitation  all proceeds of fire,  credit and other
         insurance,  excluding however, all insurance maintained on the lives of
         current or former employees.

         (d) "EQUIPMENT AND LEASEHOLD IMPROVEMENTS":  All of Debtor's machinery,
         equipment,  furniture,  fixtures,  trade  fixtures,  rolling  stock and
         leasehold improvements,  and intending to include all tangible personal
         property  utilized in the conduct of Debtor's  business (but  excluding
         any property  hereinbefore  defined as "Inventory")  and all additions,
         accessions,   substitutions,   components  and  replacements   thereto,
         therefor  and thereof and all proceeds  thereof.  (The  reservation  by
         Secured  Party of its right to  proceeds  shall not be  construed  as a
         consent by Secured Party to the sale or other  disposition of Equipment
         or of any interest therein.)

         (e)  "GENERAL  INTANGIBLES":  All of Debtor's  general  intangibles  as
         defined  in the  Uniform  Commercial  Code  and all  proceeds  thereof,
         including  without  limitation,  any and all  rights  of  Debtor to any
         refund of any tax assessed  against  Debtor or paid by Debtor,  and all
         contracts,  licenses,  permits, interests,  agreements,  warranties and
         approvals.

         (f) "INVENTORY": All of the Debtor's inventory, goods, merchandise, raw
         materials,  work-in-process,  finished  inventory  and  other  tangible
         personal property held by Debtor for sale or lease,  furnished or to be
         furnished under  contracts of service,  or used or consumed in Debtor's
         business,  goods  in  transit,  any and  all  returned  or  repossessed
         inventory  or   merchandise,   and  all  documents  of  title  (whether
         negotiable or  non-negotiable)  representing any of the foregoing,  and
         all proceeds thereof.



                                      - 2 -
<PAGE>

         (g)  "MATERIAL  ADVERSE  EFFECT":  A  material  adverse  effect  on the
         condition  (financial  or  otherwise)  or  on  the  earnings,  business
         affairs, properties, or assets of the Debtor.

         (h) "MAJORITY OF THE HOLDERS": Holders of Notes representing 65% of the
         aggregate principal balance remaining outstanding under the Notes as of
         the time of calculation.

         (i) "OBLIGATIONS":  All debts,  liabilities and obligation of Debtor to
         the Holders  and the Secured  Party  Agent,  as agent for the  Holders,
         under the Note and this Agreement.

         SECTION 2.  PLEDGE.  Subject to the  rights of the Senior  Lender,  and
pursuant to the grant of authority and agency hereby  irrevocably  grants to the
Secured  Party Agent by each of the Holders,  Debtor  hereby  pledges,  assigns,
transfers and grants to Secured Party Agent,  a security  interest in all of the
Collateral, which security interest is to secure the prompt and full payment and
performance of all of the Obligations.

         SECTION  3.  REPRESENTATIONS  AND  WARRANTIES.  Debtor  represents  and
warrants to the Holder that, as of the date of this Agreement:

         3.1  ORGANIZATION/QUALIFICATION.  The  Debtor  is  a  corporation  duly
organized and validly existing under the laws of the State of Delaware and is in
good standing under such laws. The Debtor has all requisite  corporate power and
authority to own, lease and operate its  properties and assets,  and to carry on
its business as presently conducted. The Debtor is qualified to do business as a
foreign  corporation in each jurisdiction in which the ownership of its property
or the nature of its  business  requires  such  qualification,  except where its
failure  to be so  qualified  would not have a  Material  Adverse  Effect on the
Debtor.

         3.2 AUTHORIZATION.  The Debtor has all requisite corporate right, power
and authority to execute and deliver this  Agreement and the Security  Documents
and  to  consummate  the  transactions  contemplated  hereby  and  thereby.  All
corporate  action on the part of the  Debtor,  its  directors  and  stockholders
necessary for the  authorization,  execution,  delivery and  performance of this
Agreement.

         SECTION 4.  AFFIRMATIVE  COVENANTS.  The Debtor  hereby  covenants  and
agrees that, from the date hereof and until the principal and interest hereunder
have been  fully paid and  satisfied,  unless a Majority  of the  Holders  shall
consent otherwise in writing:

         4.1 CORPORATE EXISTENCE. The Debtor: (i) shall do, or cause to be done,
all things, or proceed with due diligence with any actions or courses of action,
that may be necessary (A) to maintain its due organization,  valid existence and
good standing under the laws of its state of incorporation,  and (B) to preserve
and keep in full force and effect all qualifications, licenses and registrations
in those  jurisdictions  in which the  failure  to do so could  have a  Material
Adverse Effect; and (ii) shall not do, and shall not cause,  suffer or permit to
be done (by itself or  otherwise),  any act impairing its power or authority (A)
to carry on its  business  as now  conducted  or (B) to execute or deliver  this
Agreement or any other Security  Document to which it is a party,  or to perform
any of its obligations hereunder or thereunder.


                                      - 3 -
<PAGE>

         4.2 PAYMENT OF CREDITORS.  The Debtor shall comply with and observe all
material  provisions  of any  instrument  or  agreement  delivered to the Senior
Lender in connection  with the Senior Debt.  During any period in which there is
no Senior Debt outstanding,  the Debtor shall: (i) pay, or cause to be paid, all
of its  indebtedness  and other  liabilities  and  lawful  claims  (whether  for
services,  labor,  materials,  supplies or  otherwise)  as and when due,  unless
alternative  payment  arrangements have been made; (ii) perform,  or cause to be
performed, all of its obligations promptly and in accordance with the respective
terms and provisions thereof, unless alternative  performance  arrangements have
been  made;  and  (iii)  promptly  pay and  discharge,  or  cause to be paid and
discharged,  all taxes,  assessments and other  governmental  charges and levies
imposed  upon the Debtor,  upon its income or receipts or upon any of its assets
and  properties  on or before the last day on which the same may be paid without
penalty;  provided,  however,  that it shall  not  constitute  a breach  of this
Section if the Debtor  fails to perform any such  obligation  or to pay any such
indebtedness  or  other  liability   (except  for  the  principal  and  interest
obligations hereunder),  tax, assessment,  or governmental or other charge, levy
or claim: (A) that (1) is being delayed,  in the case of trade payables (but not
other  obligations),  in  accordance  with the normal  payment  practices of the
Debtor,  or (2) is being  contested  in good  faith  and by  proper  proceedings
diligently  pursued,  or (3) is less than $100,000 in the aggregate;  (B) if the
effect of such  failure  to pay or  perform  will not (1)  cause or  permit  the
acceleration  of the maturity of any other  indebtedness  or  obligation  of the
Debtor (i.e.,  other than the one being  contested),  or (2) subject any part of
the assets and properties of the Debtor to attachment,  levy or forfeiture;  (C)
for which the Debtor has obtained a bond or insurance, or established a reserve,
in an  amount  that  in the  judgment  of the  Secured  Party  is  adequate  and
satisfactory;  and (D) so long as the  aggregate  amount of such unpaid  overdue
items does not at any time exceed $1,500,000.

         SECTION 5. NEGATIVE  COVENANTS.  The Debtor  covenants and agrees that,
from the date hereof until its obligations  under the Notes have been fully paid
and satisfied, unless the Secured Party Agent, acting on behalf of a Majority of
the Holders, shall consent otherwise in writing:

         5.1 NO  PAYMENTS.  The Debtor  shall not prepay,  acquire or  otherwise
satisfy,  in whole or in part, any of its indebtedness prior to when due, except
indebtedness owed to the holder(s) of any Senior Debt or the Obligations.

         5.2 NO  GUARANTEES.  The Debtor shall not directly or indirectly  make,
create, incur, assume, permit to exist,  increase,  renew or extend any guaranty
on its part of any indebtedness or other obligation of any other person.

         5.3 NO SALES. The Debtor shall not directly or indirectly effect, enter
into or offer or agree to: (i) any sale, lease, assignment, conveyance, spin-off
or other  transfer or disposition of all or any material part of its business or
assets and properties; (ii) any merger, consolidation,  dissolution, liquidation
or winding up,  excluding,  however,  any merger or similar  transaction  of the
subsidiaries of the Debtor into the Debtor;  or (iii) any material change in the
character of its business as  conducted  on the date of this  Agreement,  or any
adverse change in the method by which that business is conducted.


                                      - 4 -
<PAGE>

         5.4 NO  REDEMPTIONS.  The Debtor shall not directly or indirectly:  (i)
redeem, purchase or otherwise acquire any securities issued by the Debtor or any
option or other right to acquire any such securities  other than as and when the
same shall come due or be  available  for call under the terms of any  governing
instruments;  or (ii) covenant or otherwise arrange with any person other than a
Senior  Lender  to  directly  or  indirectly  limit or  otherwise  restrict  any
dividend,  advance  or  other  payment  or  distribution  (whether  of  cash  or
otherwise) to or for the benefit of the Holders.

         5.5  NO  RELATED  TRANSACTIONS.   The  Debtor  shall  not  directly  or
indirectly  enter  into  any  transaction  with,  or use any  material  asset or
property of, any affiliate of the Debtor  (including,  without  limitation,  the
lease, purchase, sale or exchange of any asset or property, any advance or loan,
the provision of any services,  or any  allocation of  administrative  salaries,
expenses and other  general  overhead),  other than in the  ordinary  course and
pursuant to the  reasonable  requirement  of the business of the Debtor and upon
fair and reasonable terms and provisions no less favorable to the Debtor than it
could have obtained in a comparable arm'slength transaction with a person who is
not an affiliate of the Debtor;  provided that the foregoing  restriction  shall
not  apply to (i) the  payment  of  reasonable  and  customary  regular  fees to
directors  of the Debtor who are not  employees  of the  Debtor;  (ii) loans and
advances  to officers of the Debtor  approved by the Board of  Directors  of the
Debtor; (iii) reasonable  employment  arrangements and benefit programs approved
by the Board of Directors of the Debtor;  and (iv) the grant of reasonable stock
options or similar  rights to employees and directors of the Debtor  pursuant to
plans approved by the Board of Directors.

         5.6 OFFICES; RECORDS. Debtor has places of business only at 25B Hanover
Road, Suite 3305,  Florham Park, NJ; 1717 Diplomacy Row,  Orlando,  FL; and , CA
and all  Collateral  presently  owned or hereafter  acquired by Debtor,  and all
records  relating  thereto  shall be kept  only at one of those  locations,  and
Debtor shall notify Secured Party Agent no less than thirty (30) days before any
change is made in the foregoing addresses.

         SECTION 6.  TERMINATION  OF SECURITY  INTEREST.  The Security  Interest
granted  hereunder shall  terminate when the  Obligations  shall have been fully
paid and satisfied.  Upon such complete  payment and  satisfaction,  the Secured
Party Agent shall reassign,  release and/or deliver to the Debtor all Collateral
then held by or at the  direction of the Secured  Party;  and the Secured  Party
Agent shall execute and deliver to the Debtor for filing in each office in which
any financing statement,  mortgage, or lease, or assignment thereof, relating to
the  Collateral,  or any part  thereof,  shall have been  filed,  a  termination
statement  under the Uniform  Commercial  Code or an  appropriate  satisfaction,
release,  reconveyance or  reassignment  releasing the Secured Party Agent's and
the Holders'  interests  therein,  and any other instrument or document that the
Debtor deems  reasonably  necessary to evidence the  termination  of the Secured
Party's and the Holders' security interest.

         SECTION  7.  EVENTS OF  DEFAULT.  Each of the  following  events  shall
constitute a default under this Agreement (each, an "EVENT OF DEFAULT"): (a) the
material breach of any  representation,  warranty or covenant  contained in this
Agreement; or (b) the occurrence of any Event of Default set forth in the Note.


                                      - 5 -
<PAGE>

         SECTION  8.  RIGHTS  OF THE  HOLDERS  AND  SECURED  PARTY  AGENT TO THE
COLLATERAL.  Upon the  occurrence  and  during the  continuance  of any Event of
Default and subject  and  subordinated  in right of payment to any rights of the
holder(s) of any Senior Debt in and to the Collateral, a Majority of the Holders
may cause the Secured Party Agent to take any or all of the  following  actions,
after  giving  the Debtor and the  holders of Senior  Debt at least 20  business
days' prior written  notice (which  notice  period the Debtor  acknowledges  and
agrees to be adequate and reasonable):

         (a)  prohibit  the  Debtor  from  taking  any  action   respecting  any
         Collateral otherwise permitted by this Agreement;

         (b) notify any other  obligors,  issuers,  custodians  and parties with
         respect to or interested in any item of the  Collateral of the Holder's
         interest  therein or of any action  proposed  to be taken with  respect
         thereto,  and direct one or more of those parties to make all payments,
         distributions and proceeds otherwise payable to the Debtor with respect
         thereto  directly to the  Secured  Party Agent on behalf of the Holders
         Party,  or its order,  until notified by a Secured Party Agent that all
         of the Obligations to the Holders have been fully paid and satisfied;

         (c) receive and retain all payments,  distributions and proceeds of any
         kind with respect to any and all of the Collateral;

         (d) take any action  with  respect to the offer,  sale,  lease or other
         disposition, and delivery of the whole of, or from time to time any one
         or more items of, the Collateral;

         (e) exercise any voting,  consent,  enforcement or other right,  power,
         privilege,  remedy or interest of the Debtor  pertaining to any item of
         Collateral  to the same  extent  as if the  Holders  were the  outright
         owners thereof;

         (f) take  possession  of and  thereafter  deal with or use from time to
         time  all or any  part  of the  Collateral  in all  respects  as if the
         Holders were the outright owners thereof; and

         (g) in addition to, and not by way of limitation  of, any of the rights
         specified  above,  exercise  or  enforce  any and all  rights,  powers,
         privileges, remedies and interest afforded to the Secured Parties under
         the Note,  this  Agreement and any and all provisions of applicable law
         (including,  without limitation,  the Uniform Commercial Code), whether
         as a secured party in possession of Collateral or otherwise.

         SECTION 9. APPLICATION OF PROCEEDS,  ETC. The Secured Party Agent shall
collect the cash proceeds  received from any sale or other  disposition  or from
any other source  contemplated  by Section 8 hereof,  and,  after  deducting all
costs and expenses  incurred by him and any person designated to take any of the
actions  enumerated in Section 8 hereof in connection  with such  collection and
sale  or  disposition   (including,   without   limitation,   attorneys'   fees,
disbursements and expenses), the Secured Party Agent shall apply the same to the
Obligations  in  accordance  with the terms and  provisions of the Note and this
Agreement. In the event any funds remain after


                                      - 6 -
<PAGE>

satisfaction  in full of all  such  Obligations,  then  the  remainder  shall be
returned to the Debtor.  In the event that the amount of all  proceeds  received
with respect to and in liquidation of the Collateral  shall be  insufficient  to
pay and satisfy Obligations in full, the Debtor acknowledges and agrees that the
Debtor shall remain and be liable for any deficiency.

         SECTION 10.       FURTHER ASSURANCES.

         (a) The  Debtor  agrees  to do such  further  acts and  things,  and to
         execute and  deliver,  all such  statements,  assignments,  agreements,
         instruments and other documents, as the Secured Party from time to time
         reasonably request in connection with the administration,  maintenance,
         enforcement  or  adjudication  of the Notes and this Agreement in order
         (i) to  evidence,  confirm,  perfect or protect the  Security  Interest
         granted or required to have been granted under this Agreement,  or (ii)
         to otherwise  effectuate  the purpose and the terms and  provisions  of
         this  Agreement,  provided  that,  the  Secured  Party  Agent  shall be
         responsible for the preparation and filing, if applicable,  of any such
         assignments, financing statements and other documents.

         (b) The  Holders  and the Secured  Party  Agent  jointly and  severally
         hereby  agree to do such  further  acts and things,  and to execute and
         deliver, all such statements, assignments,  agreements, instruments and
         other  documents  as the Debtor or any  Senior  Lender may from time to
         time  or  at  any  time  reasonably  request  in  connection  with  the
         administration,  maintenance,  enforcement or adjudication of the Notes
         or  this  Agreement,   the  priority  of  the  Senior  Lender  and  the
         subordination  of the rights of the Holders and the Secured Party Agent
         to the Senior Lender, or otherwise as needed (i) to evidence,  confirm,
         perfect or effect the subordinate  nature of the Notes and the Security
         Interest granted or intended to have been granted under this Agreement,
         or  (ii)  to  otherwise  effectuate  the  purpose  and  the  terms  and
         provisions of the Notes and this  Agreement,  provided that, the Debtor
         shall be responsible for the preparation and filing, if applicable,  of
         any such assignments, subordination statements and other documents.

         SECTION 11. SECURED PARTY AGREEMENT. The Secured Party Agent shall hold
the  Collateral  and act  hereunder  solely for the benefit of Holders;  and the
duties and  responsibilities  of the  Secured  Party  Agent are limited to those
expressly set forth herein: (a) The Secured Party Agent, in its sole discretion,
may disregard any and all notices or  instructions,  excepting only such notices
or instructions as are hereinabove  provided for and excepting orders or process
of  any  court  or  binding  arbitration  entered  or  issued  with  or  without
jurisdiction,  including without limitation any attachment,  garnishment,  levy,
stay, injunction,  or declaratory judgment; (b) the Secured Party Agent may rely
and shall be fully  protected in acting upon any paper or other  document  which
may be submitted to it in connection with its duties  hereunder and which it has
no reasonable  basis to believe to be other than accurate,  truthful and genuine
and to have been signed as  presented  by the proper  party or parties and shall
have no  liability  or  responsibility  with  respect to the form,  execution or
validity thereof; (c) the Secured Party Agent shall not be required to institute
or defend any action or legal process  involving  any matter  referred to herein
which in any manner affects it or its duties or liabilities hereunder unless and
until it has received full indemnity in an amount, and of such character,  as it
shall in its sole discretion require, against any


                                      - 7 -
<PAGE>

and all  claims,  liabilities,  judgments,  attorneys'  fees and other costs and
expenses  of any and every  kind in  relation  thereto;  (d) the  Holders  agree
jointly and  severally to indemnify  and save the Secured  Party Agent  harmless
from and against any and all claims, liabilities, judgments, attorneys' fees and
other costs and  expenses of any and every kind and nature,  whether or not suit
is  commenced,  which  may be  incurred  or  sustained  by it by  reason  of its
compliance or attempted  compliance with the terms hereof; (e) the Secured Party
Agent shall provide  prompt  written notice to each Holder each time the Secured
Agent  Party  becomes  aware of any  event for which  the  Secured  Party  Agent
believes it is entitled to be indemnified hereunder;  each Holder shall have the
opportunity  to defend,  or  participate in the defense of, all claims for which
they may have to indemnify  the Secured Party Agent  hereunder;  (f) the Secured
Party Agent shall not be  responsible  for any act or failure to act on its part
except in the case of its own bad  faith or gross  negligence;  (g) the  Secured
Party Agent shall have no responsibility whatsoever with respect to the recitals
contained  herein  or any other  agreements,  documents,  obligations  or rights
between Holders and Debtor.

         SECTION 12.  JURISDICTION.  The Debtor hereby irrevocably  consents and
submits to, and the Secured Party,  by its acceptance  hereof,  likewise  hereby
irrevocably  consents and submits to, the exclusive  jurisdiction  of the United
States  District  Court  for the  State of New  Jersey  in  connection  with any
proceeding  arising  out of or  relating  to  this  Agreement  or  the  Security
Documents,  waives any  objection to venue in such  District  (unless such court
lacks  jurisdiction  with respect to such  proceeding in which case,  the Debtor
irrevocably  consents and submits to, and the Secured  Party,  by its acceptance
hereof,  likewise  irrevocably  consents and submits to, the jurisdiction of the
courts of the State of New Jersey in connection  with such proceeding and waives
any  objection to venue in Morris  County,  State of New Jersey) and agrees that
service of any  summons,  complaint,  notice or other  process  relating to such
proceeding may be effected in the manner provided by Section 13 hereof.

         SECTION 13. NOTICES. All notices and other  communications  required or
permitted to be given in respect of this Agreement shall be in writing and shall
be given as and shall be deemed  to have  been  given if so given) by  delivery,
telegram,  telex or facsimile, or by mail (registered or certified mail, postage
prepaid,  return receipt  requested) or by any courier service,  such as Federal
Express,  providing  proof of delivery,  provided  that any notice  delivered as
herein  provided shall also be delivered by facsimile (if a facsimile  number is
provided below) at the time of such delivery. All communications hereunder shall
be delivered to the  respective  parties at the following  addresses (or at such
other  address for a party as shall be specified by like notice,  provided  that
notices of a change of address shall be effective only upon receipt thereof):

         (i)      If to the Debtor, to:

                  Datametrics Corporation
                  25B Hanover Road; #3305
                  Florham Park, NJ 07932
                  Attn.: Daniel P. Ginns, CEO
                  Facsimile No.: (973) 377-5736


                                      - 8 -
<PAGE>

                  With a copy to:

                  Lane Altman & Owens LLP
                  101 Federal Street
                  Boston, MA 02110
                  Attn: Joseph F. Mazzella
                  Facsimile No.: (617) 345-0400

         (ii) If to the Secured Party Agent, to:

                  c/o Burnham Securities
                  1325 Avenue of the Americas, 17th Floor
                  New York, NY  10105

         SECTION 14.  REIMBURSEMENT.  The Debtor agrees to reimburse the Secured
Party for all its costs and expenses,  including reasonable  attorneys' fees and
disbursements,  expended in collecting any amounts due hereunder or in otherwise
enforcing any of its rights hereunder.

         SECTION 15.  SEVERABILITY.  In the event that any term or  provision of
this Agreement shall be finally determined to be superseded, invalid, illegal or
otherwise  unenforceable  pursuant to applicable law by a governmental authority
having  jurisdiction and venue, that determination shall not impair or otherwise
affect the validity,  legality or enforceability (i) by or before that authority
of the remaining  terms and  provisions of this Agreement and the other Security
Documents,  which shall be enforced as if the  unenforceable  term or  provision
were deleted,  or (ii) by or before any other  authority of any of the terms and
provisions of this Agreement.

         SECTION 16. SECTION AND OTHER HEADINGS.  The section and other headings
contained in this Agreement are for reference purposes only and shall not affect
the meaning or interpretation of this Agreement.

         SECTION  17.  GOVERNING  LAW.  This  Agreement  has been  executed  and
delivered  in the State of New Jersey and shall be governed by and  construed in
accordance with the applicable laws pertaining in the State of New Jersey (other
than those that would defer to the substantive laws of another jurisdiction).

         SECTION  18.   SUCCESSORS   AND   ASSIGNS,   ASSIGNMENT   AND  INTENDED
BENEFICIARIES.  Whenever in this Agreement  reference is made to any party, such
reference  shall be deemed to include the successors,  assigns,  heirs and legal
representatives  of such party,  and,  without  limiting the  generality  of the
foregoing, all representations,  warranties, covenants and other agreements made
by or on behalf of the Debtor in this  Agreement  shall  inure to the benefit of
the participants and other successors and assigns of the Secured Party.

         SECTION 19. ENTIRE AGREEMENT.  This Agreement,  the Note, and the other
instruments  executed pursuant to the Subscription  Agreement contain the entire
agreement of the parties and supersedes all other  representations,  warranties,
agreements and understandings, oral or otherwise, among the parties with respect
to the matters contained herein and therein.


                                      - 9 -
<PAGE>

         IN WITNESS WHEREOF, the Debtor, each Holder and the Secured Party Agent
have executed and delivered this Agreement as of the date first written above.

                                       DEBTOR: DATAMETRICS CORPORATION


                                       By: _____________________________________
                                           Name:       Daniel P. Ginns
                                           Title:      Chief Executive Officer

                                           25B Hanover Road, Suite 3305
                                           Florham Park, New Jersey 07932
                                           Facsimile No.: 973-377-5736


                                  SECURED PARTY AGENT:


                                  __________________________________
                                  Name: Bruce Galloway


Holders:


_____________________________                    _______________________________


_____________________________                    _______________________________


_____________________________                    _______________________________


_____________________________                    _______________________________



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