THERMOSPECTRA CORP
8-K, 1999-05-25
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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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



                                 Date of Report
                      (Date of earliest event reported):

                                  May 21, 1999

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


                            THERMOSPECTRA CORPORATION
             (Exact name of Registrant as specified in its charter)


Delaware                      1-13876                     04-3242970
(State or other             (Commission                (I.R.S. Employer
jurisdiction of               File Number)             Identification Number)
incorporation or
organization)


8 East Forge Parkway
Franklin, Massachusetts                                          02038
(Address of principal executive offices)                      (Zip Code)


                                 (781) 622-1000
                         (Registrant's telephone number
                              including area code)

<PAGE>

      This Form 8-K contains forward-looking statements that involve a number of
risks and  uncertainties.  Important  factors that could cause actual results to
differ  materially from those indicated by such  forward-looking  statements are
set forth under the heading  "Forward-looking  Statements"  in Exhibit 13 to the
Registrant's  Annual  Report on Form 10-K for the year  ended  January  2, 1999.
These include risks and uncertainties  relating to: market growth, the impact of
technological   change,   significant   international   operations,    increased
competition,   the  Registrant's   acquisition   strategy,   dependence  on  the
semiconductor  industry,  the  protection,  defense,  and  use  of  intellectual
property, and the potential impact of the year 2000 on processing date-sensitive
information.

Item 5.     OTHER EVENTS

      On May 21, 1999, the Registrant issued a press release stating that it has
entered  into a  definitive  agreement  and  plan  of  merger  with  its  parent
corporation,  Thermo Instrument Systems Inc. ("Thermo Instrument"),  under which
Thermo  Instrument would acquire all of the outstanding  common stock,  $.01 par
value per share (the "Common  Stock"),  held by the public  stockholders  of the
Registrant.  The Registrant's board of directors unanimously approved the merger
agreement  based on a  recommendation  from a Special  Committee of its board of
directors formed to evaluate Thermo Instrument's offer.

      Under the terms of the merger agreement, each issued and outstanding share
of  Common  Stock not  already  owned by Thermo  Instrument  or Thermo  Electron
Corporation,  the Registrant's  ultimate parent corporation ("Thermo Electron"),
would be  converted  into the right to  receive  $16.00 in cash.  Following  the
merger, the shares of Common Stock would cease to be publicly traded.

      The Registrant  expects that the necessary filings with the Securities and
Exchange  Commission (the "SEC") will be made shortly,  and that proxy materials
for a special meeting will be mailed to stockholders of the Registrant  promptly
after completion of SEC review.  Thermo Electron and Thermo Instrument intend to
vote all of their  shares of the Common Stock in favor of approval of the merger
agreement and,  therefore,  approval is assured.  The transaction is expected to
close during the third calendar quarter of 1999.

<PAGE>


Item 7.     FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

      (a)    Financial Statements of Business Acquired: not
            applicable.

      (b)   Pro Forma Financial Information: not applicable.

      (c)   Exhibits:

            2.1   Agreement  and Plan of Merger  dated as of May 21, 1999 by and
                  among  Thermo   Instrument   Systems  Inc.,   TS   Acquisition
                  Corporation and ThermoSpectra Corporation.


<PAGE>

                                    SIGNATURE



      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, thereunto duly authorized, on this 25th day of May, 1999.



                                        THERMOSPECTRA CORPORATION



                                        By:  /s/ Theo Melas-Kyriazi
                                             ----------------------------
                                             Theo Melas-Kyriazi
                                             Chief Financial Officer


<PAGE>


                                                                     EXHIBIT 2.1





                          AGREEMENT AND PLAN OF MERGER

                                  BY AND AMONG

                         THERMO INSTRUMENT SYSTEMS INC.

                           TS ACQUISITION CORPORATION

                                       AND

                            THERMOSPECTRA CORPORATION



                            DATED AS OF MAY 21, 1999

<PAGE>


                                TABLE OF CONTENTS

                                                                            Page

ARTICLE I THE MERGER.........................................................2

1.1.  The Merger.............................................................2

1.2.  Effective Time; Closing................................................2

1.3.  Effect of the Merger...................................................2

1.4.  Certificate of Incorporation; Bylaws...................................2

1.5.  Directors and Officers.................................................3

1.6.  Effect on Capital Stock................................................3

1.7.  Surrender of Certificates..............................................4

1.8.  No Further Ownership Rights in ThermoSpectra Common Stock..............5

1.9.  Lost, Stolen or Destroyed Certificates.................................5

1.10. Dissenting Shares......................................................5

1.11. Taking of Necessary Action; Further Action.............................6

ARTICLE II REPRESENTATIONS AND WARRANTIES OF THERMOSPECTRA...................6

2.1.  Organization of ThermoSpectra..........................................6

2.2.  ThermoSpectra Capital Structure........................................6

2.3.  Authority..............................................................6

2.4.  Board Approval.........................................................7

2.5.  Fairness Opinion.......................................................7

ARTICLE III REPRESENTATIONS AND WARRANTIES OF THERMO INSTRUMENT AND
      MERGER SUB.............................................................8

3.1.  Organization...........................................................8

3.2.  Authority..............................................................8

3.3.  Financial Resources....................................................9

ARTICLE IV CONDUCT PRIOR TO THE EFFECTIVE TIME...............................9

4.1.  Conduct of Business by ThermoSpectra...................................9

4.2.  Certain Actions by ThermoSpectra.......................................9

ARTICLE V ADDITIONAL AGREEMENTS.............................................11

5.1.  Schedule 13E-3; Proxy Statement; Other Filings........................11

5.2.  Meeting of ThermoSpectra Stockholders.................................12

5.3.  Access to Information.................................................12

                                       -i-
<PAGE>


                               TABLE OF CONTENTS
                                  (continued)

                                                                            Page

5.4.  Public Disclosure.....................................................12

5.5.  Legal Requirements....................................................12

5.6.  Notification of Certain Matters.......................................13

5.7.  Best Efforts and Further Assurances...................................13

5.8.  Stock Option and Employee Stock Purchase Plans........................13

5.9.  Thermo Instrument Form S-8............................................14

5.10. Indemnification; Insurance............................................14

5.11. Deferred Compensation Plan............................................15

ARTICLE VI CONDITIONS TO THE MERGER.........................................15

6.1.  Conditions to Obligations of Each Party to Effect the Merger..........15

6.2.  Additional Conditions to Obligations of ThermoSpectra.................15

6.3.  Additional Conditions to the Obligations of Thermo Instrument and
      Merger Sub............................................................16

ARTICLE VII TERMINATION, AMENDMENT AND WAIVER...............................16

7.1.  Termination...........................................................16

7.2.  Notice of Termination; Effect of Termination..........................17

7.3.  Fees and Expenses.....................................................18

7.4.  Amendment.............................................................18

7.5.  Extension; Waiver.....................................................18

ARTICLE VIII GENERAL PROVISIONS.............................................18

8.1.  Non-Survival of Representations and Warranties........................18

8.2.  Notices...............................................................18

8.3.  Counterparts..........................................................19

8.4.  Entire Agreement......................................................19

8.5.  Severability..........................................................19

8.6.  Other Remedies; Specific Performance..................................20

8.7.  Governing Law.........................................................20

8.8.  Assignment............................................................20


                                      -ii-
<PAGE>

                          AGREEMENT AND PLAN OF MERGER


      This  AGREEMENT AND PLAN OF MERGER (the  "Agreement")  dated as of May 21,
1999 is by and among Thermo  Instrument  Systems  Inc.,  a Delaware  corporation
("Thermo Instrument"),  TS Acquisition Corporation, a Delaware corporation and a
wholly-owned  subsidiary of Thermo Instrument  ("Merger Sub"), and ThermoSpectra
Corporation, a Delaware corporation ("ThermoSpectra").

                                    RECITALS

      A. Thermo Instrument and its parent,  Thermo Electron Corporation ("Thermo
Electron"),  own  approximately  82% and 10%,  respectively,  of the outstanding
shares  of common  stock,  par  value  $.01 per  share,  of  ThermoSpectra  (the
"ThermoSpectra  Common  Stock"),  and Thermo  Instrument  desires to acquire the
remaining outstanding shares of ThermoSpectra Common Stock.

      B. Upon the terms and subject to the  conditions of this  Agreement and in
accordance  with the  Delaware  General  Corporation  Law (the  "DGCL"),  Thermo
Instrument and ThermoSpectra will enter into a business combination  transaction
pursuant  to which  Merger  Sub will  merge  with  and into  ThermoSpectra  (the
"Merger").

      C. The Board of Directors of Thermo Instrument (i) has determined that the
Merger is consistent with and in furtherance of the long-term  business strategy
of Thermo Instrument,  and (ii) has approved this Agreement,  the Merger and the
other transactions contemplated by this Agreement.

      D. The Board of Directors of  ThermoSpectra,  on the  recommendation  of a
special  committee  of the Board of  Directors  consisting  of all  directors of
ThermoSpectra  that are not (a) officers or directors  of Thermo  Instrument  or
Thermo Electron or (b) officers of ThermoSpectra (the "Special  Committee") that
this Agreement, including the Exchange Price (as defined below), is fair to, and
in the best interests of, the stockholders of  ThermoSpectra  (other than Thermo
Instrument  and  Thermo  Electron),  (i)  has  determined  that  the  Merger  is
consistent  with  and in  furtherance  of the  long-term  business  strategy  of
ThermoSpectra  and fair to, and in the best interests of,  ThermoSpectra and its
stockholders,  (ii) has approved and deemed advisable this Agreement, the Merger
and  the  other  transactions  contemplated  by this  Agreement  and  (iii)  has
recommended the approval of this Agreement by the stockholders of ThermoSpectra.

      E. Thermo Instrument,  ThermoSpectra and Merger Sub desire to make certain
representations  and  warranties  and other  agreements in  connection  with the
Merger.

      NOW,   THEREFORE,   in  consideration  of  the  covenants,   promises  and
representations set forth herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged,  the parties agree
as follows:
<PAGE>



                                    ARTICLE I
                                   THE MERGER

      1.1.  The Merger.  At the  Effective  Time (as defined in Section 1.2) and
subject  to and  upon  the  terms  and  conditions  of  this  Agreement  and the
applicable  provisions  of the DGCL,  Merger  Sub shall be merged  with and into
ThermoSpectra,  the separate  corporate  existence of Merger Sub shall cease and
ThermoSpectra shall continue as the surviving corporation.  ThermoSpectra as the
surviving  corporation after the Merger is hereinafter  sometimes referred to as
the "Surviving Corporation."

      1.2. Effective Time; Closing. Subject to the provisions of this Agreement,
the  parties  hereto  shall  cause  the  Merger  to be  consummated  by filing a
Certificate of Merger (the  "Certificate of Merger") with the Secretary of State
of the State of Delaware in accordance with the relevant  provisions of the DGCL
(the time of such filing,  or such later time as may be agreed in writing by the
parties and specified in the Certificate of Merger,  being the "Effective  Time"
and the date on which the Effective Time occurs being the  "Effective  Date") as
soon as practicable on the Closing Date (as herein defined).  Unless the context
otherwise  requires,  the term "Agreement" as used herein refers collectively to
this  Agreement and the  Certificate  of Merger.  The closing of the Merger (the
"Closing")  shall take place at the  executive  offices of Thermo  Electron at a
time and date to be specified  by the parties,  which shall be no later than the
second business day after the satisfaction or waiver of the conditions set forth
in Article VI, or at such other time,  date and  location as the parties  hereto
agree in writing (the "Closing Date"). At the Closing,  (i) ThermoSpectra  shall
deliver to Thermo Instrument the various  certificates and instruments  required
under  Article  VI,  (ii)  Thermo  Instrument  and Merger  Sub shall  deliver to
ThermoSpectra the various certificates and instruments required under Article VI
and (iii) ThermoSpectra and Merger Sub shall execute and file the Certificate of
Merger with the Secretary of State of the State of Delaware.

      1.3. Effect of the Merger. At the Effective Time, the effect of the Merger
shall be as provided in this  Agreement  and the  applicable  provisions  of the
DGCL. Without limiting the generality of the foregoing,  and subject thereto, at
the Effective Time all the property, rights,  privileges,  powers and franchises
of ThermoSpectra and Merger Sub shall vest in the Surviving Corporation, and all
debts,  liabilities and duties of ThermoSpectra  and Merger Sub shall become the
debts, liabilities and duties of the Surviving Corporation.

      1.4.  Certificate of Incorporation; Bylaws.

            (a) At the Effective  Time,  the  Certificate  of  Incorporation  of
ThermoSpectra,  as in effect  immediately  prior to the Effective Time, shall be
the Certificate of Incorporation of the Surviving  Corporation  until thereafter
amended as provided by law and such Certificate of Incorporation.

            (b) The Bylaws of ThermoSpectra,  as in effect  immediately prior to
the Effective Time, shall be, at the Effective Time, the Bylaws of the Surviving
Corporation until thereafter amended.

                                       2
<PAGE>


      1.5.  Directors and Officers.  The directors of ThermoSpectra  immediately
prior to the  Effective  Time shall be the initial  directors  of the  Surviving
Corporation,  to serve until their  respective  successors  are duly  elected or
appointed and qualified. The officers of ThermoSpectra  immediately prior to the
Effective  Time shall be the  officers of the  Surviving  Corporation,  to serve
until their successors are duly elected or appointed or qualified.

      1.6.  Effect on Capital  Stock.  At the  Effective  Time, by virtue of the
Merger and without any action on the part of Merger  Sub,  ThermoSpectra  or the
holders of any of the following securities:

            (a)  Conversion  of  ThermoSpectra   Common  Stock.  Each  share  of
ThermoSpectra  Common  Stock  issued and  outstanding  immediately  prior to the
Effective Time (other than any shares of ThermoSpectra  Common Stock held in the
treasury of ThermoSpectra, by Thermo Instrument or Thermo Electron or Dissenting
Shares, as defined in Section 1.10 hereof) will be automatically  converted into
the right to receive  Sixteen  Dollars  ($16.00) in cash (the "Exchange  Price")
upon  surrender  of the  certificate  representing  such share of  ThermoSpectra
Common  Stock in the manner  provided  in Section 1.7 (or in the case of a lost,
stolen or destroyed  certificate,  upon  delivery of an affidavit  (and bond, if
required) in the manner provided in Section 1.9).

            (b) Stock  Options.  All  options to purchase  ThermoSpectra  Common
Stock then outstanding  under the Park Scientific  Instruments  Corporation 1988
Incentive Stock Plan,  ThermoSpectra's  Equity  Incentive Plan,  ThermoSpectra's
Employees  Equity  Incentive Plan and  ThermoSpectra's  Directors'  Stock Option
Plan, each as amended (together,  the "ThermoSpectra Stock Option Plans"), shall
be converted into options to purchase Thermo  Instrument common stock, par value
$.10 per share ("Thermo  Instrument  Common Stock"),  in accordance with Section
5.8 hereof.

            (c) Capital  Stock of Merger Sub.  Each share of Common  Stock,  par
value $.01 per share, of Merger Sub issued and outstanding  immediately prior to
the  Effective  Time shall cease to be  outstanding,  be  cancelled  and retired
without payment of any consideration therefor and cease to exist.

            (d) Treasury Stock;  Affiliate  Stock.  Each share of  ThermoSpectra
Common Stock issued and  outstanding  and owned by Thermo  Instrument and Thermo
Electron   shall  be  converted  into  one  validly   issued,   fully  paid  and
nonassessable share of Common Stock of the Surviving  Corporation.  All treasury
shares held by ThermoSpectra immediately prior to the Effective Time shall cease
to be outstanding, be cancelled and retired without payment of any consideration
therefor and cease to exist.

            (e)  Adjustments  to Exchange  Price.  The  Exchange  Price shall be
adjusted to reflect  fully the effect of any stock split,  reverse  stock split,
stock dividend (including any dividend or distribution of securities convertible
into ThermoSpectra Common Stock),  recapitalization or other like change without
receipt of consideration with respect to ThermoSpectra Common Stock occurring on
or after the date hereof and prior to the Effective Time.

                                       3
<PAGE>

      1.7.  Surrender of Certificates.

            (a) Payment Agent.  Thermo  Instrument  shall  authorize one or more
persons to act as the payment agent (the "Payment Agent") in the Merger.

            (b) Thermo Instrument to Provide Exchange Consideration. Immediately
prior to the Effective Time,  Thermo  Instrument  shall deposit with the Payment
Agent,  in  trust  for  the  benefit  of  the  holders  of   certificates   (the
"Certificates")  representing  shares of  ThermoSpectra  Common Stock  converted
pursuant to Section  1.6(a) for payment in accordance  with this Article I, cash
in an amount equal to the product of the Exchange Price multiplied by the number
of shares of  ThermoSpectra  Common  Stock  entitled to  conversion  for payment
pursuant to Section 1.6(a).

            (c) Exchange  Procedures.  Promptly after, and in no event more than
five days after, the Effective Time,  Thermo  Instrument shall cause the Payment
Agent  to mail  to  each  holder  of  record  (as of the  Effective  Time)  of a
Certificate (i) a letter of transmittal (which shall specify that delivery shall
be effected,  and risk of loss and title to the  Certificates  shall pass,  only
upon delivery of the Certificates to the Payment Agent and shall be in such form
and have such other provisions as Thermo Instrument may reasonably  specify) and
(ii)  instructions  for  effecting  the  exchange  of the  Certificates  for the
Exchange Price.  Upon surrender of a Certificate for cancellation to the Payment
Agent or to such other agent or agents as may be appointed by Thermo Instrument,
together with such letter of transmittal  duly completed and validly executed in
accordance with the instructions  thereto,  the holder of such Certificate shall
be  entitled  to receive in  exchange  therefor  payment of the  Exchange  Price
multiplied by the number of shares of ThermoSpectra  Common Stock represented by
such  Certificate,  without  interest,  and the Certificate so surrendered shall
forthwith be cancelled. Until so surrendered,  each outstanding Certificate will
be deemed from and after the  Effective  Time,  for all corporate  purposes,  to
evidence only the right to receive  payment of the Exchange Price for each share
of ThermoSpectra Common Stock represented on such Certificate.

            (d) Transfers of Ownership.  If payment of the Exchange  Price is to
be made to any  person  other  than the  person  in whose  name the  Certificate
surrendered in exchange  therefor is registered,  it will be a condition of such
payment  that the  Certificate  so  surrendered  will be properly  endorsed  and
otherwise  in proper  form for  transfer  and that the  person  requesting  such
payment will have paid to Thermo  Instrument  or any agent  designated by it any
transfer or other taxes required by reason of payment to a person other than the
registered  holder  of  the  Certificate  surrendered,  or  established  to  the
satisfaction  of Thermo  Instrument or any agent  designated by it that such tax
has been paid or is not payable.

            (e) No Liability.  Notwithstanding  anything to the contrary in this
Section  1.7,  neither the  Payment  Agent,  Thermo  Instrument,  the  Surviving
Corporation  nor any  party  hereto  shall be  liable  to a holder  of shares of
ThermoSpectra  Common Stock for any amount  properly  paid to a public  official
pursuant to any applicable abandoned property, escheat or similar law.


            (f) Responsibility;  Term. The Payment Agent shall make the payments
referred to in Section  1.6(a) out of the funds  supplied by Thermo  Instrument.
Promptly  following  the date that is six months after the Effective  Date,  the
Payment Agent shall, upon

                                       4
<PAGE>
request  by  Thermo   Instrument,   deliver  to  Thermo   Instrument  all  cash,
Certificates and other documents in its possession  relating to the transactions
described in this  Agreement,  and the Payment  Agent's duties shall  terminate.
Thereafter,  each  holder  of a  Certificate  formerly  representing  shares  of
ThermoSpectra  Common Stock may surrender such Certificate to Thermo  Instrument
and (subject to applicable abandoned property, escheat and similar laws) receive
in exchange  therefor the Exchange  Price  multiplied by the number of shares of
ThermoSpectra Common Stock represented by such Certificate, without any interest
thereon,  but shall have no greater rights against Thermo Instrument than as may
be accorded to general creditors of Thermo Instrument under applicable law.

      1.8.  No Further  Ownership  Rights in  ThermoSpectra  Common  Stock.  All
amounts  paid upon the  surrender  of shares of  ThermoSpectra  Common  Stock in
accordance  with the  terms  hereof  shall be  deemed  to have been paid in full
satisfaction  of all rights  pertaining to such shares of  ThermoSpectra  Common
Stock, and there shall be no further registration of transfers on the records of
the  Surviving  Corporation  of shares of  ThermoSpectra  Common Stock that were
outstanding  immediately  prior to the  Effective  Time.  If after the Effective
Time,  Certificates  are presented to the Surviving  Corporation for any reason,
they shall be  cancelled  and  exchanged  for rights to receive  the  applicable
aggregate Exchange Price as provided in this Article I.

      1.9. Lost, Stolen or Destroyed Certificates. In the event any Certificates
shall have been lost,  stolen or  destroyed,  the  Payment  Agent  shall pay the
aggregate   Exchange  Price  in  respect  of  such  lost,  stolen  or  destroyed
Certificates,  upon  the  making  of an  affidavit  of that  fact by the  holder
thereof;  provided,  however,  that,  as a  condition  precedent  to the payment
thereof, the owner of such lost, stolen or destroyed  Certificates shall deliver
a bond in such sum as Thermo  Instrument  or the  Payment  Agent may  reasonably
direct as indemnity against any claim that may be made against Thermo Instrument
or the Payment Agent with respect to the Certificates alleged to have been lost,
stolen or  destroyed,  unless  Thermo  Instrument  waives  such  requirement  in
writing.

      1.10.  Dissenting  Shares.  Notwithstanding  any other  provision  of this
Agreement, shares of ThermoSpectra Common Stock that are outstanding immediately
prior to the Effective  Time and which are held by  stockholders  who shall have
demanded  properly in writing  appraisal of such shares in accordance  with DGCL
Section 262 and who shall not have withdrawn such demand or otherwise  forfeited
appraisal rights (collectively,  the "Dissenting Shares") shall not be converted
into or represent  the right to receive the Exchange  Price.  Such  stockholders
shall, as of the Effective Time,  cease to retain any rights with respect to the
ThermoSpectra  Common Stock, except as provided in the DGCL, including the right
to  receive  payment  of the  appraised  value  of the  shares  held  by them in
accordance  with the  provisions of Section 262,  provided  that all  Dissenting
Shares held by  stockholders  (i) who shall have failed to perfect or lost their
rights to appraisal of such shares under Section 262, or (ii) who have withdrawn
their demand for appraisal  within 60 days after the  Effective  Date and accept
the terms  offered  upon the Merger in  accordance  with Section  262(e),  shall
thereupon  be, or be  deemed to have  been,  converted  into and to have  become
exchangeable,  as of the Effective  Time, for the right to receive,  without any
interest thereon, the Exchange Price, upon surrender,  in the manner provided in
Section 1.7, of the Certificates that formerly evidenced such shares without the
prior consent of Thermo Instrument.

                                       5
<PAGE>

      1.11.  Taking of Necessary Action;  Further Action.  If, at any time after
the Effective  Time,  any further  action is necessary or desirable to carry out
the purposes of this Agreement and to vest the Surviving  Corporation  with full
right, title and possession to all assets, property, rights, privileges,  powers
and  franchises of  ThermoSpectra  and Merger Sub, the officers and directors of
ThermoSpectra  and  Merger  Sub  are  fully  authorized  in the  name  of  their
respective corporations or otherwise to take, and will take, all such lawful and
necessary action, so long as such action is consistent with this Agreement.


                                   ARTICLE II
               REPRESENTATIONS AND WARRANTIES OF THERMOSPECTRA

      ThermoSpectra  represents and warrants to Thermo Instrument and Merger Sub
as follows:

      2.1.  Organization  of  ThermoSpectra.   ThermoSpectra  and  each  of  its
subsidiaries  is a  corporation  or other legal entity duly  organized,  validly
existing  and in  good  standing  under  the  laws  of the  jurisdiction  of its
incorporation or organization,  has the corporate or similar power to own, lease
and operate its property and to carry on its business as now being conducted and
as  proposed by  ThermoSpectra  to be  conducted,  and is duly  qualified  to do
business and in good standing as a foreign  corporation or other legal entity in
each  jurisdiction in which the failure to be so qualified would have a material
adverse effect on ThermoSpectra.

      2.2.  ThermoSpectra  Capital  Structure.  The authorized  capital stock of
ThermoSpectra  consists of 25,000,000 shares of Common Stock, par value $.01 per
share, of which there were 15,335,839  shares issued and outstanding as of April
3, 1999, and 423 shares in treasury as of April 3, 1999. All outstanding  shares
of ThermoSpectra  Common Stock are duly authorized,  validly issued,  fully paid
and  non-assessable and are not subject to preemptive rights created by statute,
the Certificate of  Incorporation or Bylaws of ThermoSpectra or any agreement or
document to which ThermoSpectra is a party or by which it is bound. As of May 5,
1999, an aggregate of 1,650,043  shares of  ThermoSpectra  Common Stock,  net of
exercises, were reserved for issuance to employees, consultants and non-employee
directors pursuant to the ThermoSpectra  Stock Option Plans, under which options
are   outstanding  for  an  aggregate  of  1,188,655   shares.   All  shares  of
ThermoSpectra  Common Stock subject to issuance as  aforesaid,  upon issuance on
the terms and conditions specified in the instruments pursuant to which they are
issuable,   would  be  duly   authorized,   validly   issued,   fully  paid  and
nonassessable.

      2.3.  Authority.

            (a) ThermoSpectra has all requisite corporate power and authority to
enter  into this  Agreement  and to  consummate  the  transactions  contemplated
hereby. The execution and delivery of this Agreement and the consummation of the
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate action on the part of  ThermoSpectra,  subject only to the adoption of
this Agreement by  ThermoSpectra's  stockholders and the filing and recording of
the Certificate of Merger pursuant to the DGCL. Under the DGCL,  ThermoSpectra's
stockholders  may adopt this  Agreement  by vote of the holders of a majority of
the outstanding  shares of ThermoSpectra  Common Stock.  This Agreement has been
duly


                                       6
<PAGE>

executed and  delivered by  ThermoSpectra,  and assuming the due  authorization,
execution  and delivery by Thermo  Instrument  and Merger Sub,  constitutes  the
valid and binding  obligation of  ThermoSpectra,  enforceable in accordance with
its terms. The execution and delivery of this Agreement by ThermoSpectra do not,
and the  performance of this Agreement by  ThermoSpectra  will not, (i) conflict
with or violate the  Certificate of  Incorporation  or Bylaws of  ThermoSpectra,
(ii) subject to obtaining the adoption by  ThermoSpectra's  stockholders of this
Agreement as contemplated  in Section 5.2 and compliance  with the  requirements
set forth in Section  2.3(b)  below,  conflict  with or violate  any law,  rule,
regulation,  order, judgment or decree applicable to ThermoSpectra or any of its
material  subsidiaries or by which its or their respective  properties is bound,
or (iii) result in any breach of or  constitute a default (or an event that with
notice or lapse of time or both  would  become a default)  under,  or impair the
rights of  ThermoSpectra  or alter the rights or  obligations of any third party
under, or give to others any rights of termination,  amendment,  acceleration or
cancellation  of, or result in the creation of a lien or  encumbrance  on any of
the properties or assets of  ThermoSpectra  or any of its material  subsidiaries
pursuant to, any note, bond, mortgage,  indenture,  contract,  agreement, lease,
license,   permit,   franchise  or  other  instrument  or  obligation  to  which
ThermoSpectra  or  any of its  material  subsidiaries  is a  party  or by  which
ThermoSpectra  or any  of  its  material  subsidiaries  or  its or any of  their
properties  are bound or  affected,  except,  with  respect to clauses  (ii) and
(iii), for any such conflicts,  violations,  defaults or other  occurrences that
would not have a  material  adverse  effect on  ThermoSpectra  or the  Surviving
Corporation.

            (b)  No   consent,   approval,   order  or   authorization   of,  or
registration,  declaration  or filing with any court,  administrative  agency or
commission  or  other   governmental   or   regulatory   body  or  authority  or
instrumentality  ("Governmental  Entity")  is  required  by or with  respect  to
ThermoSpectra in connection with the execution and delivery of this Agreement or
the consummation of the  transactions  contemplated  hereby,  except for (i) the
filing of the  Certificate  of Merger with the  Secretary  of State of Delaware,
(ii) the filing of the Proxy  Statement  (as  defined  in  Section  5.1) and the
Schedule 13E-3 (as defined in Section 5.1) with the U.S. Securities and Exchange
Commission  ("SEC") in accordance  with the Securities  Exchange Act of 1934, as
amended (the "Exchange Act") and (iii) such other consents,  approvals,  orders,
authorizations, registrations, declarations and filings as may be required under
applicable federal and state securities laws.

      2.4.  Board  Approval.  The  Board of  Directors  of  ThermoSpectra,  upon
recommendation  of the Special  Committee  that this  Agreement,  including  the
Exchange  Price,  is fair to, and in the best interests of, the  stockholders of
ThermoSpectra (other than Thermo Instrument and Thermo Electron), has, as of the
date of this  Agreement,  unanimously  (i) adopted a resolution  approving  this
Agreement and declaring its  advisability,  (ii)  determined  that the Merger is
fair to, and in the best interests of,  ThermoSpectra and its stockholders,  and
(iii)  determined to recommend that the  stockholders of  ThermoSpectra  approve
this Agreement.

      2.5. Fairness Opinion. The Special Committee of ThermoSpectra has received
an opinion from Tucker Anthony  Incorporated dated May 21, 1999 that, as of such
date, the  consideration to be received by  ThermoSpectra's  stockholders in the
Merger is fair, from a financial point of view, to ThermoSpectra's  stockholders
other than Thermo Instrument and Thermo Electron.

                                       7
<PAGE>



                                   ARTICLE III
      REPRESENTATIONS AND WARRANTIES OF THERMO INSTRUMENT AND MERGER SUB

      Thermo Instrument and Merger Sub represent and warrant to ThermoSpectra as
follows:

      3.1.  Organization.  Thermo  Instrument is a corporation  duly  organized,
validly  existing and in good  standing  under the laws of the State of Delaware
and Merger Sub is a corporation  duly  organized,  validly  existing and in good
standing under the laws of the State of Delaware,  each has the corporate  power
to own, lease and operate its property and to carry on its business as now being
conducted and as proposed to be conducted,  and is duly qualified to do business
and in good standing as a foreign  corporation in each jurisdiction in which the
failure  to be so  qualified  would  have a  material  adverse  effect on Thermo
Instrument or Merger Sub.

      3.2.  Authority.

            (a) Each of  Thermo  Instrument  and  Merger  Sub has all  requisite
corporate power and authority to enter into this Agreement and to consummate the
transactions  contemplated  hereby. The execution and delivery of this Agreement
and the  consummation  of the  transactions  contemplated  hereby have been duly
authorized by all necessary  corporate  action on the part of Thermo  Instrument
and Merger Sub,  subject only to the filing and recording of the  Certificate of
Merger pursuant to the DGCL. This Agreement has been duly executed and delivered
by each of Thermo Instrument and Merger Sub and, assuming the due authorization,
execution  and  delivery of this  Agreement  by  ThermoSpectra,  this  Agreement
constitutes  the valid and binding  obligation of each of Thermo  Instrument and
Merger Sub, enforceable in accordance with its terms. The execution and delivery
of this  Agreement by each of Thermo  Instrument  and Merger Sub do not, and the
performance of this  Agreement by each of Thermo  Instrument and Merger Sub will
not, (i) conflict with or violate the Certificate of  Incorporation or Bylaws of
Thermo  Instrument or the Certificate of  Incorporation or Bylaws of Merger Sub,
(ii) subject to compliance  with the  requirements  set forth in Section  3.2(b)
below,  conflict with or violate any law, rule,  regulation,  order, judgment or
decree  applicable  to Thermo  Instrument  or any of its  material  subsidiaries
(including  Merger Sub, but excluding  ThermoSpectra and its subsidiaries) or by
which its or any of their respective  properties is bound or affected,  or (iii)
result in any breach of or constitute a default (or an event that with notice or
lapse  of  time or  both  would  become  a  default)  under,  or  impair  Thermo
Instrument's rights or alter the rights or obligations of any third party under,
or  give to  others  any  rights  of  termination,  amendment,  acceleration  or
cancellation  of, or result in the creation of a lien or  encumbrance  on any of
the  properties  or  assets  of  Thermo   Instrument  or  any  of  its  material
subsidiaries   (including  Merger  Sub,  but  excluding  ThermoSpectra  and  its
subsidiaries)  pursuant  to,  any note,  bond,  mortgage,  indenture,  contract,
agreement,  lease, license,  permit, franchise or other instrument or obligation
to which Thermo Instrument or any of its material subsidiaries (including Merger
Sub, but excluding  ThermoSpectra  and its  subsidiaries) is a party or by which
Thermo Instrument or any of its material subsidiaries (including Merger Sub, but
excluding  ThermoSpectra and its subsidiaries) or its or any of their respective
properties  are bound or  affected,  except,  with

                                       8
<PAGE>
respect to clauses (ii) and (iii), for any such conflicts,  violations, defaults
or other  occurrences  that would not have a material  adverse  effect on Thermo
Instrument or Merger Sub.

            (b)  No   consent,   approval,   order  or   authorization   of,  or
registration,  declaration or filing with any Governmental Entity is required by
or with  respect  to Thermo  Instrument  or Merger  Sub in  connection  with the
execution and delivery of this Agreement or the consummation of the transactions
contemplated hereby, except for (i) the filing of the Certificate of Merger with
the  Secretary of State of Delaware,  (ii) the filing of the Schedule  13E-3 (as
defined in Section 5.1) with the SEC in  accordance  with the Exchange  Act, and
(iii) such other consents,  approvals,  orders,  authorizations,  registrations,
declarations and filings as may be required under  applicable  federal and state
securities laws.

      3.3. Financial Resources. Thermo Instrument has the financial resources to
consummate  the  transactions  contemplated  by  this  Agreement  and to pay the
consideration in the Merger provided for in Section 1.6(a).


                                   ARTICLE IV
                       CONDUCT PRIOR TO THE EFFECTIVE TIME

      4.1. Conduct of Business by ThermoSpectra. During the period from the date
of this  Agreement and continuing  until the earlier of the  termination of this
Agreement  pursuant to its terms or the  Effective  Time,  ThermoSpectra  shall,
except as  otherwise  contemplated  by this  Agreement or consented to by Thermo
Instrument,  carry on its business in the usual, regular and ordinary course, in
substantially the same manner as heretofore  conducted,  pay its debts and taxes
when due subject to good faith disputes over such debts or taxes, pay or perform
other material obligations when due, and use its commercially reasonable efforts
consistent  with past  practices  and  policies to  preserve  intact its present
business  organization,  keep available the services of its present officers and
employees   and   preserve  its   relationships   with   customers,   suppliers,
distributors,  licensors,  licensees,  and  others  with  which it has  business
dealings.

      4.2.  Certain  Actions  by  ThermoSpectra.  In  addition,  notwithstanding
Section 4.1 above, without the prior consent of Thermo Instrument, ThermoSpectra
shall not do any of the following:

            (a) Waive any stock repurchase rights,  accelerate,  amend or change
the period of  exercisability of options or restricted stock, or reprice options
granted under any employee, consultant or director stock plans or authorize cash
payments in exchange for any options granted under any of such plans;

            (b)  Enter  into  any  material  partnership   arrangements,   joint
development agreements or strategic alliances;

            (c)  Grant  any  severance  or  termination  pay to any  officer  or
employee except payments in amounts  consistent with policies and past practices
or pursuant to written agreements outstanding, or policies existing, on the date
hereof, or adopt any new severance plan;

                                       9
<PAGE>

            (d) Declare or pay any dividends on or make any other  distributions
(whether in cash,  stock or property) in respect of any capital  stock or split,
combine or  reclassify  any capital  stock or issue or authorize the issuance of
any  other  securities  in  respect  of, in lieu of or in  substitution  for any
capital stock;

            (e)  Issue,  deliver,  sell,  authorize  or  propose  the  issuance,
delivery or sale of, any shares of capital stock or any  securities  convertible
into shares of capital stock, or subscriptions,  rights,  warrants or options to
acquire any shares of capital stock or any securities convertible into shares of
capital  stock,  or enter into other  agreements or commitments of any character
obligating it to issue any such shares or convertible securities, other than the
issuance of shares of  ThermoSpectra  Common  Stock  pursuant to the exercise of
stock options therefor;

            (f) Cause,  permit or propose any  amendments to its  Certificate of
Incorporation or Bylaws;

            (g) Acquire or agree to acquire by merging or consolidating with, or
by purchasing any equity interest in or a material  portion of the assets of, or
by any other  manner,  any business or any  corporation,  partnership  interest,
association or other business  organization  or division  thereof,  or otherwise
acquire  or agree to  acquire  any  assets  or enter  into any  joint  ventures,
strategic partnerships or alliances;

            (h) Sell,  lease,  license,  encumber  or  otherwise  dispose of any
properties or assets that are material, individually or in the aggregate, to the
business of ThermoSpectra;

            (i) Incur any  indebtedness  for borrowed money (other than ordinary
course trade payables or pursuant to existing credit  facilities in the ordinary
course of business) or guarantee any such indebtedness or issue or sell any debt
securities or warrants or guarantee any debt securities of others;

            (j) Adopt or amend any employee  benefit or stock purchase or option
plan, or enter into any  employment  contract,  pay any special bonus or special
remuneration to any director or employee, or increase the salaries or wage rates
of its  officers or  employees,  except  increases  in amounts  consistent  with
policies and past practices;

            (k) Pay,  discharge or satisfy any claim,  liability  or  obligation
(absolute, accrued, asserted or unasserted, contingent or otherwise), other than
the payment, discharge or satisfaction in the ordinary course of business;

            (l) Make any grant of exclusive rights to any third party; or

            (m)  Agree  in  writing  or  otherwise  to take  any of the  actions
described in this Section 4.2.

                                       10
<PAGE>

                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

      5.1. Schedule 13E-3; Proxy Statement; Other Filings.

            (a)   ThermoSpectra   agrees  that  the   information   supplied  by
ThermoSpectra  for  inclusion  or  incorporation  by reference in the Rule 13e-3
Transaction   Statement  on  Schedule  13E-3  (such  Schedule,   as  amended  or
supplemented,  is  referred  to herein  as the  "Schedule  13E-3")  or the proxy
statement to be sent to the stockholders of ThermoSpectra in connection with the
meeting  of  ThermoSpectra's  stockholders  to  consider  the  adoption  of this
Agreement and approval of the Merger (the "ThermoSpectra Stockholders' Meeting")
(such proxy statement, as amended or supplemented,  is referred to herein as the
"Proxy Statement") shall not, on the date the Proxy Statement is first mailed to
ThermoSpectra's  stockholders and at the time of the ThermoSpectra Stockholders'
Meeting,  contain any untrue  statement of a material  fact or omit to state any
material  fact  required to be stated  therein or necessary in order to make the
statements therein, in light of the circumstances under which they are made, not
false or misleading; or omit to state any material fact necessary to correct any
statement in any earlier written  communication with respect to the solicitation
of proxies for the  ThermoSpectra  Stockholders'  Meeting or the Schedule  13E-3
that has become false or misleading.

            (b) Thermo Electron, Thermo Instrument and Merger Sub agree that the
information  supplied by Thermo Electron,  Thermo  Instrument and Merger Sub for
inclusion in the Schedule 13E-3 and the Proxy  Statement  shall not, on the date
the Proxy Statement is first mailed to ThermoSpectra's stockholders,  and at the
time of the ThermoSpectra Stockholders' Meeting, contain any untrue statement of
a material fact or omit to state any material fact required to be stated therein
or  necessary  in  order  to  make  the  statements  therein,  in  light  of the
circumstances  under which they are made,  not false or  misleading;  or omit to
state any  material  fact  necessary  to correct  any  statement  in any earlier
written  communication  with  respect to the  solicitation  of  proxies  for the
ThermoSpectra  Stockholders' Meeting or the Schedule 13E-3 that has become false
or misleading.

            (c)  As  promptly  as  practicable   after  the  execution  of  this
Agreement,  Thermo Electron,  Thermo Instrument and  ThermoSpectra  will jointly
prepare and file with the SEC the Schedule 13E-3 and the Proxy Statement. Thermo
Electron,  Thermo Instrument and ThermoSpectra will cause the Schedule 13E-3 and
the Proxy  Statement  to be  mailed  to  stockholders  of  ThermoSpectra  at the
earliest  practicable  time.  Each party will notify the other promptly upon the
receipt of any comments  from the SEC or its staff and of any request by the SEC
or its staff or any other government  officials for amendments or supplements to
the Schedule 13E-3 or the Proxy  Statement or any other filing or for additional
information  and will supply the other  party with copies of all  correspondence
between such party or any of its representatives,  on the one hand, and the SEC,
or its staff or any other government officials,  on the other hand, with respect
to the Proxy  Statement,  the Schedule  13E-3 or the Merger.  Whenever any event
occurs that is required to be set forth in an  amendment  or  supplement  to the
Schedule 13E-3 or the Proxy  Statement,  the relevant party will promptly inform
the other party of such  occurrence  and cooperate in filing with the SEC or its
staff or any other  government  officials,  and/or  mailing to  stockholders  of
ThermoSpectra, such amendment or supplement.

                                       11
<PAGE>

            (d) The Proxy Statement will include the recommendation of the Board
of Directors of  ThermoSpectra  in favor of approval of this  Agreement  (except
that the Board of Directors of  ThermoSpectra  may  withdraw,  modify or refrain
from making such  recommendation to the extent that the Board determines in good
faith on the written advice of outside legal counsel that the Board's  fiduciary
duties under applicable law require it to do so).

      5.2.  Meeting  of  ThermoSpectra  Stockholders.  Promptly  after  the date
hereof, ThermoSpectra will take all action necessary in accordance with the DGCL
and its  Certificate of  Incorporation  and Bylaws to convene the  ThermoSpectra
Stockholders'  Meeting to be held as promptly as practicable  for the purpose of
voting upon this Agreement. Unless otherwise required by the fiduciary duties of
the ThermoSpectra Board of Directors, ThermoSpectra will use its best efforts to
solicit from its stockholders proxies in favor of the approval of this Agreement
and the Merger,  and will take all other action necessary or advisable to secure
the vote or  consent of its  stockholders  required  by the DGCL to obtain  such
approvals. Each of Thermo Instrument and Thermo Electron shall vote, or cause to
be voted, all of the ThermoSpectra  Common Stock then owned by it and any of its
subsidiaries in favor of the approval of this Agreement and the Merger.

      5.3. Access to Information.  ThermoSpectra  will afford Thermo  Instrument
and its accountants,  counsel and other representatives reasonable access during
normal  business  hours to the  properties,  books,  records  and  personnel  of
ThermoSpectra  during  the  period  prior to the  Effective  Time to obtain  all
information concerning the business, including the status of product development
efforts,  properties,  results of operations and personnel of ThermoSpectra,  as
Thermo Instrument may reasonably request. Thermo Instrument agrees that it will,
and will cause its  representatives  and agents  to,  keep all such  information
confidential and will not, and will cause its  representatives or agents not to,
use any  information  obtained  pursuant  to this  Section  5.3 for any  purpose
unrelated  to  the  consummation  of  the  transactions   contemplated  by  this
Agreement.  Notwithstanding  the  foregoing,  Thermo  Instrument  shall  not  be
required to keep  confidential any information (i) which is or becomes generally
available to the public,  other than by wrongful disclosure by Thermo Instrument
or Merger Sub in violation of this Agreement, (ii) which was available to Thermo
Instrument on a nonconfidential  basis prior to disclosure to Thermo Instrument,
or (iii) which becomes available to Thermo Instrument on a nonconfidential basis
from a source other than ThermoSpectra.

      5.4. Public  Disclosure.  Thermo Instrument and ThermoSpectra will consult
with each other before issuing any press release or otherwise  making any public
statement  with respect to the Merger or this  Agreement  and will not issue any
such press release or make any such public statement prior to such consultation,
except  as may be  required  by law or any  listing  agreement  with a  national
securities exchange.

      5.5.  Legal  Requirements.  Each  of  Thermo  Instrument,  Merger  Sub and
ThermoSpectra  will take all reasonable actions necessary or desirable to comply
promptly with all legal requirements that may be imposed on them with respect to
the consummation of the transactions  contemplated by this Agreement  (including
furnishing all  information  required in connection with approvals of or filings
with any Governmental Entity, and including using its reasonable best efforts to
defend any  litigation  prompted  hereby) and will promptly  cooperate  with and
furnish  information to any party hereto  necessary in connection  with any such


                                       12
<PAGE>
requirements  imposed  upon  any of them or  their  respective  subsidiaries  in
connection  with  the  consummation  of the  transactions  contemplated  by this
Agreement.

      5.6.  Notification of Certain  Matters.  Thermo  Instrument and Merger Sub
will give prompt notice to  ThermoSpectra,  and  ThermoSpectra  will give prompt
notice to Thermo  Instrument,  of the  occurrence,  or failure to occur,  of any
event,  which occurrence or failure to occur would be reasonably likely to cause
(a) any  representation or warranty  contained in this Agreement to be untrue or
inaccurate in any material  respect at any time from the date of this  Agreement
to the Effective  Time,  or (b) any material  failure of Thermo  Instrument  and
Merger Sub or  ThermoSpectra,  as the case may be, or of any officer,  director,
employee or agent thereof, to comply with or satisfy any covenant,  condition or
agreement  to be  complied  with  or  satisfied  by  it  under  this  Agreement.
Notwithstanding  the above,  the delivery of any notice pursuant to this section
will not limit or otherwise affect the remedies available hereunder to the party
receiving such notice or the conditions to such party's obligation to consummate
the Merger.

      5.7. Best Efforts and Further Assurances. Subject to the respective rights
and  obligations of Thermo  Instrument and  ThermoSpectra  under this Agreement,
each of the parties to this Agreement  will use its  reasonable  best efforts to
effectuate  the Merger  and the other  transactions  contemplated  hereby and to
fulfill  and  cause  to be  fulfilled  the  conditions  to  closing  under  this
Agreement,  it  being  understood  that  such  efforts  shall  not  include  any
obligation to settle any litigation  prompted hereby.  Each party hereto, at the
reasonable request of another party hereto,  will execute and deliver such other
instruments  and do and perform such other acts and things as may be  reasonably
necessary  or  desirable  for  effecting  completely  the  consummation  of  the
transactions contemplated hereby.

      5.8.  Stock Option and Employee Stock Purchase Plans.

     (a) At the Effective  Time, each  outstanding  option to purchase shares of
ThermoSpectra  Common  Stock (each a  "ThermoSpectra  Stock  Option")  under the
ThermoSpectra Stock Option Plans, whether or not exercisable, will be assumed by
Thermo  Instrument.  Each  ThermoSpectra  Stock  Option  so  assumed  by  Thermo
Instrument  under this  Agreement  will continue to have, and be subject to, the
same terms and conditions set forth in the applicable ThermoSpectra Stock Option
Plan immediately prior to the Effective Time (including, without limitation, any
repurchase  rights),  except that (i) each  ThermoSpectra  Stock  Option will be
exercisable  (or will become  exercisable in accordance with its terms) for that
number of whole shares of Thermo Instrument Common Stock equal to the product of
the  number of shares of  ThermoSpectra  Common  Stock that were  issuable  upon
exercise of such  ThermoSpectra  Stock Option immediately prior to the Effective
Time multiplied by a fraction (the "Exchange Ratio"),  the numerator of which is
the  Exchange  Price and the  denominator  of which is the closing  price of the
Thermo  Instrument  Common Stock on the day immediately  preceding the Effective
Date as reported by the  American  Stock  Exchange,  rounded down to the nearest
whole number of shares of Thermo Instrument Common Stock, and (ii) the per share
exercise  price for the shares of Thermo  Instrument  Common Stock issuable upon
exercise  of such  assumed  ThermoSpectra  Stock  Option  will be  equal  to the
quotient  determined by dividing the exercise  price per share of  ThermoSpectra
Common  Stock  at  which  such   ThermoSpectra   Stock  Option  was  exercisable
immediately prior to the Effective Time by the Exchange Ratio, rounded up to the
nearest whole cent. After the Effective Time, Thermo Instrument will issue to

                                       13
<PAGE>

each holder of an outstanding ThermoSpectra Stock Option a notice describing the
foregoing assumption of such ThermoSpectra Stock Option by Thermo Instrument.

            (b) At the  Effective  Time,  each  outstanding  option to  purchase
shares of ThermoSpectra Common Stock (each, a "ThermoSpectra ESPP Stock Option")
under the ThermoSpectra  Employees' Stock Purchase Plan  ("ThermoSpectra  ESPP")
will be assumed by Thermo  Instrument.  Each  ThermoSpectra ESPP Stock Option so
assumed by Thermo  Instrument will continue to have, and be subject to, the same
terms and  conditions  as are set forth in the  ThermoSpectra  ESPP  immediately
prior  to the  Effective  Time  except  that  (i) the  assumed  option  shall be
exercisable  for shares of Thermo  Instrument  Common  Stock;  (ii) the purchase
price per  share of Thermo  Instrument  Common  Stock  shall be the lower of (A)
eighty-five  percent  (85%) of (x) the per-share  Market Value of  ThermoSpectra
Common  Stock on the Grant Date  divided  by (y) the  Exchange  Ratio,  with the
resulting  price  rounded up to the  nearest  whole  cent,  and (B)  eighty-five
percent  (85%) of the Market Value of Thermo  Instrument  Common Stock as of the
Exercise  Date;  and (iii) the $25,000 limit under Section  9.2(i) of the Thermo
Spectra  ESPP  shall be  applied  by taking  into  account  Thermo  Instrument's
assumption of the  ThermoSpectra  ESPP Stock Options in accordance  with Section
423(b)(8)  of the  Internal  Revenue Code of 1986,  as amended,  and  applicable
regulations. For purposes of this subsection,  "Market Value," "Grant Date," and
"Exercise Date" shall have the meaning given them in the ThermoSpectra ESPP.

            (c)  Thermo  Instrument  will  reserve  sufficient  shares of Thermo
Instrument Common Stock for issuance under this Section 5.8.

      5.9.  Thermo  Instrument  Form  S-8.  Thermo  Instrument  agrees to file a
registration  statement  on Form S-8 or, if  required,  an  amendment  to Thermo
Instrument's  then  effective  registration  statement  on Form S-8, for (i) the
shares of Thermo  Instrument  Common Stock  issuable with respect to the assumed
ThermoSpectra  Stock  Options  no later than the  Closing  Date and (ii) for the
shares of Thermo  Instrument  Common Stock  issuable with respect to the assumed
ThermoSpectra  ESPP Stock Options no later than October 31, 1999, and shall,  in
each case, keep such  registration  statement  effective for so long as any such
options remain outstanding.

      5.10. Indemnification; Insurance.

            (a) From and for a period of six (6) years after the Effective Time,
Thermo  Instrument will and will cause the Surviving  Corporation to fulfill and
honor in all respects the indemnification  obligations of ThermoSpectra pursuant
to the  provisions  of the  Certificate  of  Incorporation  and  the  Bylaws  of
ThermoSpectra  as in  effect  immediately  prior  to  the  Effective  Time.  The
Certificate  of  Incorporation  and  Bylaws of the  Surviving  Corporation  will
contain the  provisions  with  respect to  indemnification  and  elimination  of
liability for monetary damages set forth in the Certificate of Incorporation and
Bylaws of  ThermoSpectra,  which  provisions  will not be  amended,  repealed or
otherwise  modified for a period of six (6) years from the Effective Time in any
manner that would adversely affect the rights  thereunder of individuals who, at
the Effective  Time,  were directors or officers of  ThermoSpectra,  unless such
modification is required by law.

                                       14
<PAGE>

            (b) For a period of six (6) years after the Effective  Time,  Thermo
Instrument shall cause the Surviving  Corporation to, either directly or through
participation  in  Thermo  Electron's  umbrella  policy,  maintain  in  effect a
directors' and officers' liability insurance policy covering those ThermoSpectra
directors  and  officers  currently  covered  by  Thermo  Electron's   liability
insurance policy with coverage providing substantially the same amount and scope
as existing  coverage  for such  ThermoSpectra  directors  and  officers  (which
coverage may be an endorsement  extending the period in which claims may be made
under such  existing  policy);  provided,  however,  that in no event  shall the
Surviving  Corporation  be required  to expend to maintain or procure  insurance
coverage  pursuant to this Section 5.10,  directly or through  participation  in
Thermo  Electron's  policy, an amount per annum in excess of 175% of the current
annual premiums,  as adjusted for inflation each year,  allocable and payable by
ThermoSpectra (the "Maximum Premium") with respect to such insurance, or, if the
cost of such  insurance  exceeds the  Maximum  Premium,  the  maximum  amount of
coverage that can be purchased or maintained for the Maximum Premium.

      5.11. Deferred Compensation Plan. At the Effective Time, the ThermoSpectra
deferred compensation plan for directors (the "Deferred Compensation Plan") will
terminate, and ThermoSpectra will distribute to each participant the sum in cash
equal to the balance of stock units credited to his or her deferred compensation
account under the Deferred Compensation Plan as of the Effective Time multiplied
by the Exchange Price.


                                   ARTICLE VI
                            CONDITIONS TO THE MERGER

      6.1.  Conditions to  Obligations  of Each Party to Effect the Merger.  The
respective  obligations  of each  party to this  Agreement  to effect the Merger
shall be subject to the  satisfaction  at or prior to the Effective  Time of the
following conditions:

            (a)  Stockholder  Approval.  This Agreement shall have been approved
and  adopted  by the  requisite  vote  under  the  DGCL by the  stockholders  of
ThermoSpectra.

            (b) No Order.  No  Governmental  Entity shall have enacted,  issued,
promulgated, enforced or entered any statute, rule, regulation, executive order,
decree, injunction or other order (whether temporary,  preliminary or permanent)
which is in effect  and which has the  effect of making  the  Merger  illegal or
otherwise prohibiting consummation of the Merger.

      6.2.   Additional   Conditions  to  Obligations  of   ThermoSpectra.   The
obligations  of  ThermoSpectra  to  consummate  and effect  the Merger  shall be
subject to the  satisfaction  at or prior to the  Effective  Time of each of the
following  conditions,  any of which may be waived,  in writing,  exclusively by
ThermoSpectra:

            (a)   Representations   and  Warranties.   The  representations  and
warranties of Thermo Instrument and Merger Sub contained in this Agreement shall
be  true  and  correct  on and as of the  Effective  Time,  except  for  changes
contemplated  by  this  Agreement  and  except  for  those  representations  and
warranties that address matters only as of a particular date (which shall remain
true and correct as of such particular  date), with the same force and effect as
if made on

                                       15
<PAGE>

and as of the Effective Time, except, in all such cases, where the failure to be
so true  and  correct  would  not  have a  material  adverse  effect  on  Thermo
Instrument;  and ThermoSpectra  shall have received a certificate to such effect
signed on behalf of Thermo Instrument by the President,  Chief Executive Officer
or Vice President of Thermo Instrument; and

            (b) Agreements and Covenants. Thermo Instrument and Merger Sub shall
have  performed or complied in all material  respects  with all  agreements  and
covenants required by this Agreement to be performed or complied with by them on
or  prior to the  Effective  Time,  and  ThermoSpectra  shall  have  received  a
certificate  to such  effect  signed  on  behalf  of  Thermo  Instrument  by the
President, Chief Executive Officer or Vice President of Thermo Instrument.

      6.3.  Additional  Conditions to the  Obligations of Thermo  Instrument and
Merger Sub. The  obligations  of Thermo  Instrument and Merger Sub to consummate
and effect the Merger  shall be subject to the  satisfaction  at or prior to the
Effective Time of each of the following conditions,  any of which may be waived,
in writing, exclusively by Thermo Instrument:

            (a)   Representations   and  Warranties.   The  representations  and
warranties  of  ThermoSpectra  contained  in this  Agreement  shall  be true and
correct on and as of the Effective Time, except for changes contemplated by this
Agreement  and except for those  representations  and  warranties  that  address
matters only as of a particular  date (which shall remain true and correct as of
such  particular  date),  with the same force and effect as if made on and as of
the Effective Time,  except, in all such cases,  where the failure to be so true
and  correct  would not have a material  adverse  effect on  ThermoSpectra;  and
Thermo  Instrument  and  Merger Sub shall have  received a  certificate  to such
effect  signed on behalf of  ThermoSpectra  by the  President,  Chief  Executive
Officer or Vice President of ThermoSpectra; and

            (b) Agreements and Covenants.  ThermoSpectra shall have performed or
complied in all material respects with all agreements and covenants  required by
this  Agreement  to be  performed  or  complied  with by it on or  prior  to the
Effective Time, and Thermo  Instrument shall have received a certificate to such
effect  signed on behalf of  ThermoSpectra  by the  President,  Chief  Executive
Officer or Vice President of ThermoSpectra.


                                   ARTICLE VII
                        TERMINATION, AMENDMENT AND WAIVER

      7.1.  Termination.  This  Agreement may be terminated at any time prior to
the  Effective  Time of the  Merger,  whether  before or after  approval of this
Agreement by the stockholders of ThermoSpectra:

            (a) by mutual  written  consent  duly  authorized  by the  Boards of
Directors of Thermo Instrument and  ThermoSpectra  (upon approval of the Special
Committee);

            (b) by either ThermoSpectra (upon approval of the Special Committee)
or Thermo  Instrument if the Merger shall not have been  consummated  by October
31, 1999;  provided,  however,  that the right to terminate this Agreement under
this Section 7.1(b) shall not

                                       16
<PAGE>

be  available  to any party whose  action or failure to act has been a principal
cause of or  resulted  in the  failure of the Merger to occur on or before  such
date if such action or failure to act constitutes a breach of this Agreement;

            (c) by either ThermoSpectra (upon approval of the Special Committee)
or Thermo  Instrument  if a court of  competent  jurisdiction  or  governmental,
regulatory or  administrative  agency or commission  shall have issued an order,
decree or ruling or taken any other action (an "Order"),  in any case having the
effect of  permanently  restraining,  enjoining  or  otherwise  prohibiting  the
Merger, which order, decree or ruling is final and nonappealable;

            (d) by either ThermoSpectra (upon approval of the Special Committee)
or  Thermo   Instrument  if  the  required   approval  of  the  stockholders  of
ThermoSpectra  contemplated  by this  Agreement  shall not have been obtained by
reason of the failure to obtain the required vote upon a vote taken at a meeting
of stockholders duly convened  therefor or at any adjournment  thereof (provided
that the right to terminate this  Agreement  under this Section 7.1(d) shall not
be available to ThermoSpectra  where the failure to obtain stockholder  approval
of  ThermoSpectra  shall  have been  caused by the  action or  failure to act of
ThermoSpectra  in  breach of this  Agreement  and the  right to  terminate  this
Agreement under this Section 7.1(d) shall not be available to Thermo  Instrument
where  the  failure  to  obtain  the  requisite  vote  by  the  stockholders  of
ThermoSpectra  shall have been  caused by the  failure of Thermo  Instrument  or
Thermo Electron to vote their respective shares of ThermoSpectra Common Stock in
favor of the Merger and this Agreement);

            (e) by ThermoSpectra if the  ThermoSpectra  Board of Directors (upon
approval of the  Special  Committee)  determines  in good faith on the advice of
outside legal counsel that the Board's  fiduciary  duties under  applicable  law
requires it to do so;

            (f) by ThermoSpectra (upon approval of the Special Committee),  upon
a breach of any representation,  warranty,  covenant or agreement on the part of
Thermo Instrument set forth in this Agreement, if (i) as a result of such breach
the  conditions  set forth in  Section  6.2(a) or  Section  6.2(b)  would not be
satisfied as of the time of such breach and (ii) such breach shall not have been
cured by Thermo  Instrument  within ten (10) business days following  receipt by
Thermo Instrument of written notice of such breach from ThermoSpectra; or

            (g) by  Thermo  Instrument,  upon a  breach  of any  representation,
warranty,  covenant or agreement on the part of ThermoSpectra  set forth in this
Agreement, if (i) as a result of such breach the conditions set forth in Section
6.3(a) or Section  6.3(b)  would not be  satisfied as of the time of such breach
and (ii) such breach shall not have been cured by ThermoSpectra  within ten (10)
business  days  following  receipt by  ThermoSpectra  of written  notice of such
breach from Thermo Instrument.

      7.2. Notice of Termination; Effect of Termination. Any termination of this
Agreement  under  Section  7.1  above  will be  effective  immediately  upon the
delivery of written notice by the terminating party to the other parties hereto.
In the event of the  termination  of this  Agreement as provided in Section 7.1,
this  Agreement  shall be of no  further  force or effect,  except  that (i) the
confidentiality  obligations of Thermo Instrument contained in Section 5.3 shall

                                       17
<PAGE>

survive any such  termination  and (ii) nothing  herein shall  relieve any party
from liability for any breach of this Agreement.


      7.3. Fees and Expenses.  All fees and expenses incurred in connection with
this  Agreement and the  transactions  contemplated  hereby shall be paid by the
party incurring such expenses, whether or not the Merger is consummated.

      7.4.  Amendment.  Subject to applicable law, this Agreement may be amended
by the  parties  hereto at any time by  execution  of an  instrument  in writing
signed  on  behalf  of each  of the  parties  hereto;  provided,  however,  that
ThermoSpectra  may not amend this Agreement  without the approval of the Special
Committee.

      7.5. Extension;  Waiver. At any time prior to the Effective Time any party
hereto  may,  to the  extent  legally  allowed,  (i)  extend  the  time  for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in the  representations  and warranties made to such
party contained  herein or in any document  delivered  pursuant hereto and (iii)
waive  compliance  with any of the  agreements or conditions  for the benefit of
such party contained herein; provided,  however, that ThermoSpectra may not take
any such actions without the approval of the Special Committee. Any agreement on
the part of a party  hereto to any such  extension or waiver shall be valid only
if set forth in an instrument in writing signed on behalf of such party.


                                  ARTICLE VIII
                               GENERAL PROVISIONS

      8.1.  Non-Survival of Representations and Warranties.  The representations
and warranties of  ThermoSpectra,  Thermo Instrument and Merger Sub contained in
this  Agreement  shall  terminate at the Effective  Time, and only the covenants
that by their terms survive the Effective Time shall survive the Effective Time.

      8.2. Notices. All notices and other  communications  hereunder shall be in
writing  and shall be deemed  given if  delivered  personally  or by  commercial
delivery service, or sent via telecopy (receipt confirmed) to the parties at the
following  addresses or telecopy  numbers (or at such other  address or telecopy
numbers for a party as shall be specified by like notice):

            (a)   if to Thermo Instrument or Merger Sub, to:

            Thermo Instrument Systems Inc.
            860 West Airport Freeway, Suite 301
            Hurst, TX  76054
            Attention:  President
            Telephone: (817) 485-6663
            Facsimile: (817) 485-8256

                                       18
<PAGE>

            with a copy to:

            Thermo Electron Corporation
            81 Wyman Street
            Waltham, MA  02454
            Attention:  General Counsel
            Telephone: (781) 622-1000
            Facsimile: (781) 622-1283

            (b)   if to ThermoSpectra, to:

            ThermoSpectra Corp.
            8 East Forge Parkway
            Franklin, MA  02038
            Attention: President
            Telephone: (508) 528-0551
            Facsimile: (508) 520-9570

            with a copy to:

            Goodwin, Procter & Hoar  LLP
            Exchange Place
            Boston, MA 02109
            Attention: Richard A. Soden, Esq.
            Telephone: (617) 570-1533
            Facsimile: (617) 523-1231

      8.3.  Counterparts.  This  Agreement  may  be  executed  in  one  or  more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and  delivered  to the other  party,  it being  understood  that all
parties need not sign the same counterpart.

      8.4.  Entire  Agreement.  This Agreement and the documents and instruments
and other  agreements among the parties hereto as contemplated by or referred to
herein (a) constitute the entire agreement among the parties with respect to the
subject  matter hereof and supersede all prior  agreements  and  understandings,
both  written and oral,  among the parties  with  respect to the subject  matter
hereof;  and (b) are not  intended to confer upon any other person any rights or
remedies hereunder, except as set forth herein.

      8.5.  Severability.  In the event that any provision of this  Agreement or
the  application  thereof,  becomes  or is  declared  by a  court  of  competent
jurisdiction  to be  illegal,  void  or  unenforceable,  the  remainder  of this
Agreement  will  continue in full force and effect and the  application  of such
provision to other persons or circumstances will be interpreted so as reasonably
to effect the intent of the parties hereto. The parties further agree to replace
such  void or  unenforceable  provision  of  this  Agreement  with a  valid  and
enforceable  provision that will achieve, to the extent possible,  the economic,
business and other purposes of such void or unenforceable provision.

                                       19
<PAGE>

      8.6. Other Remedies;  Specific  Performance.  Except as otherwise provided
herein,  any and all remedies  herein  expressly  conferred upon a party will be
deemed  cumulative with and not exclusive of any other remedy conferred  hereby,
or by law or equity  upon such  party,  and the  exercise  by a party of any one
remedy will not preclude the exercise of any other  remedy.  The parties  hereto
agree  that  irreparable  damage  would  occur  in  the  event  that  any of the
provisions  of this  Agreement  were not  performed  in  accordance  with  their
specific terms or were  otherwise  breached.  It is accordingly  agreed that the
parties shall be entitled to an injunction or injunctions to prevent breaches of
this Agreement and to enforce  specifically  the terms and provisions  hereof in
any court of the United States or any state having  jurisdiction,  this being in
addition to any other remedy to which they are entitled at law or in equity.

      8.7.  Governing Law. This Agreement  shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts, regardless of the
laws that might otherwise govern under applicable principles of conflicts of law
thereof, except to the extent that the DGCL applies.

      8.8.  Assignment.  No party may assign either this Agreement or any of its
rights,  interests,  or obligations hereunder without the prior written approval
of the of the other parties.





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                                       20
<PAGE>



      IN WITNESS WHEREOF,  Thermo Instrument,  Merger Sub and ThermoSpectra have
caused  this  Agreement  to be signed by  themselves  or their  duly  authorized
respective officers, all as of the date first written above.


                                   THERMO INSTRUMENT SYSTEMS INC.



                                   By:       /s/ Earl R. Lewis
                                        ------------------------------
                                   Name:     Earl R. Lewis
                                   Title:    President  and
                                             Chief   Executive Officer


                                   TS ACQUISITION CORPORATION



                                   By:       /s/ Earl R. Lewis
                                        -------------------------------
                                   Name:     Earl R. Lewis
                                   Title:    President


                                   THERMOSPECTRA CORPORATION



                                   By:       /s/ Theo Melas-Kyriazi
                                        -------------------------------
                                   Name:     Theo Melas-Kyriazi
                                   Title:    Chairman of the Board and
                                             Chief Financial Officer


      Thermo Electron  Corporation joins this Agreement for the specific purpose
of  consenting  to the  provisions of Section 1.6 hereof and agreeing to perform
its obligations under Sections 5.1 and 5.2 hereof.

                                   THERMO ELECTRON CORPORATION



                                   By:       /s/  Sandra L. Lambert
                                        --------------------------------
                                   Name:     Sandra L. Lambert
                                   Title:    Vice President and Secretary



                                       21


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