UNIT INSTRUMENTS INC
8-K, 1998-07-07
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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===============================================================================

               UNITED STATES 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):   July 2, 1998
Commission File Number:  0-10095



                             Unit Instruments, Inc.
            (Exact name of registrant as specified in its charter)


            California                                         33-0077406
   (State or other jurisdiction                             (I.R.S. Employer
         of Incorporation)                               Identification Number)
                                        

            22600 Savi Ranch Parkway, Yorba Linda, California  92887
             (Address of principal executive offices and zip code)
                                        
 
       Registrant's telephone number, including area code: (714) 921-2640
                                        




                 This Report consists of forty-nine (49) pages.

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

                                       1
<PAGE>
 
Item 5.   Other Events
          ------------

On July 2, 1998, United States Filter Corporation ("U.S. Filter"), Kinetics
Acquisition Corp., a California corporation and wholly owned subsidiary of U.S.
Filter ("Subcorp"), and  Unit Instruments, Inc. ("Unit") executed an Agreement
and Plan of Merger, a copy of which is incorporated by reference as Exhibit 3.1
hereto (the "Merger Agreement").  Pursuant to the terms of the Merger Agreement,
which is incorporated herein by reference, Subcorp will, subject to certain
conditions being satisfied or waived, be merged with and into Unit (the
"Merger") and Unit will survive the merger (the "Surviving Corporation") and
become a wholly owned subsidiary of U.S. Filter.

Upon the effectiveness of the Merger, each outstanding share of common stock,
par value $0.15 per share ("Common Stock"), of Unit, with the exception of
shares held by shareholders who properly exercise dissenters' rights under the
Corporations Code of the State of California, will be converted into a number of
shares of U.S. Filter's common stock equal to the Exchange Ratio (as defined
below), collectively, the "Merger Consideration."

The exchange ratio (the "Exchange Ratio") will be calculated as follows: (a) if
the average daily closing price (the "Average Closing Price") on the New York
Stock Exchange of U.S. Filter's common stock during the 20 consecutive trading
days ending five days prior to the Shareholders' Meeting, at which the Unit
shareholders are to vote on the Merger, is equal to or exceeds $27.00, the
Exchange Ratio will be equal to $12.62 divided by the Average Closing Price; and
(b) if the Average Closing Price is less than $27.00, the Exchange Ratio will be
equal to $12.62 divided by $27.00.  If the Average Closing Price is less than
$24.00, Unit may terminate the Merger Agreement.

The closing of the merger is subject to certain conditions, including (among
others) satisfactory completion by U.S. Filter of the due diligence during the
30-day period following the date of the agreement, expiration of the Hart-Scott-
Rodino waiting period, and approval by Unit shareholders.  The transaction is
expected to close in September, 1998.  Following the merger, Unit will become a
wholly-owned subsidiary within U.S. Filter's Kinetics Group ("USF Kinetics").

At the effective time (the "Effective Time"), all outstanding stock options and
warrants to purchase Unit stock shall automatically convert into an option to
purchase a number of shares of U.S. Filter common stock equal to (x) the number
of shares of Unit Common Stock issuable immediately as of the date of this
Agreement upon exercise of such Unit stock option or warrant multiplied by (y)
the Exchange Ratio with an exercise price equal to the exercise price which
existed under the corresponding Unit stock option or warrant divided by the
Exchange Ratio, and with such other terms and conditions, subject to U.S.
Filter's approval, as were in effect under such Unit stock option or warrant as
of the date of this Agreement.

Fractional shares will not be issued, but the pro rata portion of the net
proceeds of the sale of all such shares will be paid in cash to the persons
entitled thereto.  As a result of the conversion of the Unit Common Stock, the
Unit Common Stock will be de-listed from the Nasdaq National

                                       2
<PAGE>
 
Market tier of The Nasdaq Stock Market and will not be listed on any national
securities exchange or quoted in any inter-dealer quotation system, and holders
of Unit Common Stock will become shareholders of U.S. Filter.

Additionally, if the Merger becomes effective, the directors and officers of
Subcorp, immediately prior to the Merger, will become the directors and officers
of the Surviving corporation.

The foregoing summary of the terms of the Merger Agreement does not purport to
be complete and is qualified in its entirety by reference to the full text of
the Merger Agreement.

On June 29, 1998, Unit issued a press release stating that it was in merger
discussions for the acquisition of the company, a copy of which is attached
hereto as Exhibit 99.1 and incorporated herein by reference.

On July 2, 1998, Unit issued a press release stating that it had signed a
definitive agreement regarding the Merger, a copy of which is attached hereto as
Exhibit 99.2 and incorporated herein by reference.



Item 7.  Financial Statements and Exhibits
         ---------------------------------

     (a) Financial statements of businesses acquired:  None

     (b) Pro forma financial information:   None

     (c) Exhibits:

         (3.1)   Merger Agreement, dated as of July 2, 1998, among United
                 States Filter Corporation, Kinetics Acquisition Corporation
                 and Unit Instruments, Inc.

         (99.1)  Text of Press Release issued by Unit Instruments, Inc. dated
                 June 29, 1998.

         (99.2)  Text of Press Release issued by Unit Instruments, Inc. dated
                 July 2, 1998.

                                       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.


                                          UNIT INSTRUMENTS, INC.
 


Date:  July 6, 1998                       By  /s/  GARY N. PATTEN
                                              ----------------------------
                                              /s/  Gary N. Patten
                                                   Chief Financial Officer

                                       4
<PAGE>
 
                                 Exhibit Index
                                        


Exhibit 3.1:   Merger Agreement dated as of July 2, 1998, among United States
               Filter Corporation, Kinetics Acquisition Corporation and Unit
               Instruments, Inc.


Exhibit 99.1:  Text of Press Release issued by Unit Instruments, Inc. dated 
               June 29, 1998.


Exhibit 99.2:  Text of Press Release issued by Unit Instruments, Inc. dated
               July 2, 1998.

                                       5

<PAGE>
 
                                                                     EXHIBIT 3.1


                          AGREEMENT AND PLAN OF MERGER


                                  BY AND AMONG


                       UNITED STATES FILTER CORPORATION,


                          KINETICS ACQUISITION CORP.,


                                      and


                             UNIT INSTRUMENTS, INC.


                            Dated as of July 2, 1998

<PAGE>

                          AGREEMENT AND PLAN OF MERGER

     This Agreement and Plan of Merger (this "Agreement") is made and entered
into as of July 2, 1998, by and among United States Filter Corporation, a
Delaware corporation ("Parent"), Kinetics Acquisition Corp., a California
corporation and a wholly owned subsidiary of Parent ("Subcorp"), and Unit
Instruments, Inc., a California corporation ("Unit").

                             PRELIMINARY STATEMENTS

     A.  The parties desire to effect the merger of Subcorp with and into Unit,
with Unit as the surviving corporation (the "Merger"), pursuant to which each
share of Unit Common Stock (as defined in Section 4.4) outstanding at the
Effective Time (as defined in Section 1.2) will be converted into the right to
receive shares of Parent Common Stock (as defined in Section 3.3), as more fully
provided herein.

     B.  The Board of Directors of Unit has determined that the Merger is in the
best interests of the holders of shares of Unit Common Stock ("Unit
Shareholders").

     C.  The respective Boards of Directors of Parent and Subcorp have
determined that the Merger is in the best interests of their respective
stockholders.

     D.  The parties intend that the Merger constitute a tax-free
"reorganization" within the meaning of Section 368(a)(1)(A) of the Internal
Revenue Code of 1986, as amended (the "Code"), by reason of Section 368(a)(2)(E)
thereof.

     E.  The parties intend that the Merger be accounted for as a pooling-of-
interests for accounting and financial reporting purposes.

                                 AGREEMENT

     Now, therefore, in consideration of these premises and the mutual and
dependent promises hereinafter set forth, the parties hereto agree as follows:

                                   ARTICLE I
                                  THE MERGER

     1.1  The Merger.  Upon the terms and subject to the conditions hereof, and
          ----------                                                           
in accordance with the provisions of the California Corporations Code (the
"CCC"), Subcorp shall be merged with and into Unit at the Effective Time.  As a
result of the Merger, the separate corporate existence of Subcorp shall cease
and Unit shall continue its existence under the laws of the State of California.
Unit, in its capacity as the corporation surviving the Merger, is hereinafter
sometimes referred to as the "Surviving Corporation."
<PAGE>
 
     1.2  Effective Time.  As promptly as possible on the Closing Date (as
          --------------
defined below), the parties shall cause the Merger to be consummated by filing
with the Secretary of State of the State of California (the "California
Secretary of State") a duly executed agreement of merger (the "Merger
Agreement") in accordance with Section 1103 of the CCC. The Merger shall become
effective (the "Effective Time") when the Merger Agreement has been filed with
the California Secretary of State or at such later time as shall be agreed upon
by Parent and Unit and specified in the Merger Agreement. Prior to the filing
referred to in this Section 1.2, a closing (the "Closing") shall be held at the
offices of O'Melveny & Myers LLP, 610 Newport Center Drive, Suite 1700, Newport
Beach, California, as soon as practicable following the date upon which all
conditions set forth in Article VI hereof have been satisfied or waived, or at
such other date as Parent and Unit may agree (provided that the conditions set
forth in Article VI have been satisfied or waived at or prior to such date). The
date on which the Closing takes place is referred to herein as the "Closing
Date." For all tax purposes, the Closing shall be effective at the end of the
day on the Closing Date.

     1.3  Effects of the Merger.  From and after the Effective Time, the Merger
          ---------------------                                                
shall have the effects set forth in Section 1107 of the CCC.

     1.4  Articles of Incorporation and Bylaws.  At the Effective Time (i) the
          ------------------------------------                                
Articles of Incorporation of the Surviving Corporation as in effect immediately
prior to the Effective Time shall be amended as of the Effective Time so as to
contain only the provisions contained immediately prior thereto in the Articles
of Incorporation of Subcorp, except for Article I thereof which shall continue
to read "The name of the corporation is `Unit Instruments, Inc.'", and (ii) the
Bylaws of Subcorp in effect immediately prior to the Effective Time shall be the
Bylaws of the Surviving Corporation; in each case until amended in accordance
with applicable law.

     1.5  Directors and Officers of the Surviving Corporation.  From and after
          ---------------------------------------------------                 
the Effective Time, the directors and officers of the Surviving Corporation
shall be as follows, until their respective successors are duly elected and
qualified:

          Directors:  Damian C. Georgino
                      Kevin L. Spence
                      David J. Shimmon
 

                                       2
<PAGE>
 
          Officers:  David J. Shimmon - Chairman
                     Michael Doyle - President
                     Kevin L. Spence - Vice President
                     Gary N. Patten - Vice President
                     Damian C. Georgino - Vice President
                     Dan Rubin - Vice President
                     Kurt Gilson - Vice President

     1.6  Additional Actions.  If, at any time after the Effective Time, the
          ------------------                                                
Surviving Corporation shall consider or be advised that any further deeds,
assignments or assurances or any other acts or things are necessary or desirable
to (a) vest, perfect or confirm, of record or otherwise, in the Surviving
Corporation its right, title or interest in, to or under any of the rights,
properties or assets of Unit, or (b) otherwise carry out the provisions of this
Agreement, Unit and its officers and directors shall be deemed to have granted
to the Surviving Corporation an irrevocable power of attorney to execute and
deliver all such deeds, assignments or assurances and to take all acts
necessary, proper or desirable to vest, perfect or confirm title to and
possession of such rights, properties or assets in the Surviving Corporation and
otherwise to carry out the provisions of this Agreement, and the officers and
directors of the Surviving Corporation are authorized in the name of Unit or
otherwise to take any and all such actions.

                                   ARTICLE II
                            CONVERSION OF SECURITIES

     2.1  Conversion of Capital Stock.  At the Effective Time, by virtue of the
          ---------------------------                                          
Merger and without any action on the part of Parent, Subcorp or Unit or their
respective shareholders:

          (a) Each share of common stock, $0.01 par value, of Subcorp issued and
     outstanding immediately prior to the Effective Time shall be converted into
     one share of common stock, $0.01 par value, of the Surviving Corporation.
     Such newly issued shares shall thereafter constitute all of the issued and
     outstanding capital stock of the Surviving Corporation.

          (b) Subject to the other provisions of this Article II, each share of
     Unit Common Stock issued and outstanding immediately prior to the Effective
     Time shall be converted into and represent the right to receive a number of
     shares of Parent Common Stock equal to the Exchange Ratio (as defined in
     Section 2.2(a)).

     2.2  Exchange Ratio; Fractional Shares; Adjustments.
          ---------------------------------------------- 

          (a) The "Exchange Ratio" shall equal $12.62 divided by the Parent
     Share Value.  The "Parent Share Value" shall be either (i) the average of
     the closing price per share for shares of Parent Common Stock as reported
     on the New York Stock Exchange ("NYSE") Composite Tape ("NYSE Composite
     Tape") on each of the

                                       3
<PAGE>
 
     twenty (20) consecutive trading days ending on the fifth (5th) trading day
     preceding the Closing Date (the "Average Share Price") if the Average Share
     Price is above $27.00, or (ii) $27.00 if the Average Share Price is equal
     to or less than $27.00.  No certificates for fractional Shares of Parent
     Common Stock shall be issued as a result of the conversion provided for in
     Section 2.1(b).

          (b) In lieu of any such fractional shares, the holder of a certificate
     previously evidencing Unit Common Stock, upon presentation of such
     fractional interest represented by an appropriate certificate for Unit
     Common Stock to the Exchange Agent pursuant to Section 2.3, shall be
     entitled to receive a cash payment therefor in an amount equal to the value
     (determined with reference to the closing price of shares of Parent Common
     Stock as reported on the NYSE Composite Tape on the last full trading day
     immediately prior to the Closing Date) of such fractional interest.  Such
     payment with respect to fractional shares is merely intended to provide a
     mechanical rounding off of, and is not a separately bargained for,
     consideration.  If more than one certificate representing shares of Unit
     Common Stock shall be surrendered for the account of the same holder, the
     number of shares of Parent Common Stock for which certificates have been
     surrendered shall be computed on the basis of the aggregate number of
     shares represented by the certificates so surrendered.

          (c) In the event that prior to the Effective Time Parent shall declare
     a stock dividend or other distribution payable in shares of Parent Common
     Stock or securities convertible into shares of Parent Common Stock, or
     effect a stock split, reclassification, combination or other change with
     respect to shares of Parent Common Stock, the Exchange Ratio set forth in
     this Section 2.2 shall be adjusted to reflect such dividend, distribution,
     stock split, reclassification, combination or other change.

     2.3  Exchange of Certificates.
          ------------------------ 

          (a) Exchange Agent.  Promptly following the Effective Time, Parent
              --------------                                                
     shall deposit with American Stock Transfer & Trust Company or such other
     exchange agent as may be designated by Parent (the "Exchange Agent") for
     exchange in accordance with this Section 2.3 (i) certificates representing
     shares of Parent Common Stock issuable pursuant to Section 2.1 in exchange
     for outstanding shares of Unit Common Stock, and (ii) cash in an amount
     reasonably expected to be paid pursuant to Section 2.2(b) (such shares of
     Parent Common Stock and cash, together with any dividends or distributions
     with respect thereto, being hereinafter referred to as the "Exchange
     Fund").

          (b) Exchange Procedures.  As soon as practicable after the Effective
              -------------------                                             
     Time, Parent shall instruct the Exchange Agent to mail to each holder of
     record of a certificate or certificates (the "Certificates") which
     immediately prior to the Effective Time represented outstanding shares of
     Unit Common Stock whose shares were converted into the right to receive
     shares of Parent Common Stock pursuant to

                                       4
<PAGE>
 
     Section 2.1(b), (i) a letter of transmittal (the form and substance of
     which shall have been reasonably approved by Unit prior to the Effective
     Time and 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 Exchange Agent and shall be in such form and have such
     other customary provisions as Parent may reasonably specify) and (ii)
     instructions for effecting the surrender of the Certificates in exchange
     for certificates representing shares of Parent Common Stock.  Upon
     surrender of a Certificate for cancellation to the Exchange Agent, together
     with a duly executed letter of transmittal, the holder of such Certificate
     shall be entitled to receive in exchange therefor, and the Exchange Agent
     shall deliver to the holder within five (5) business days thereafter, (x) a
     certificate or certificates representing that whole number of shares of
     Parent Common Stock which such holder has the right to receive pursuant to
     Section 2.1 in such denominations and registered in such names as such
     holder may request, and (y) a check representing the amount of cash in lieu
     of fractional shares, if any, and unpaid dividends and distributions, if
     any, which such holder has the right to receive pursuant to the provisions
     of this Article II, after giving effect to any required withholding tax.
     The shares represented by the Certificate so surrendered shall forthwith be
     cancelled.  No interest will be paid or accrued on the cash in lieu of
     fractional shares, if any, and unpaid dividends and distributions, if any,
     payable to holders of shares of Unit Common Stock.  In the event of a
     transfer of ownership of shares of Unit Common Stock which is not
     registered on the transfer records of Unit, a certificate representing the
     proper number of shares of Parent Common Stock, together with a check for
     the cash to be paid in lieu of fractional shares, if any, and unpaid
     dividends and distributions, if any, shall be issued to such transferee if
     the Certificate representing such shares of Unit Common Stock held by such
     transferee is presented to the Exchange Agent, accompanied by all documents
     required to evidence and effect such transfer and to evidence that any
     applicable stock transfer taxes have been paid.  Until surrendered as
     contemplated by this Section 2.3, each Certificate shall be deemed at any
     time after the Effective Time to represent only the right to receive upon
     surrender a certificate representing shares of Parent Common Stock and cash
     in lieu of fractional shares, if any, and unpaid dividends and
     distributions, if any, as provided in this Article II.

          (c) Distributions with Respect to Unexchanged Shares.  Notwithstanding
              ------------------------------------------------                  
     any other provisions of this Agreement, no dividends or other distributions
     declared or made after the Effective Time with respect to shares of Parent
     Common Stock having a record date after the Effective Time shall be paid to
     the holder of any unsurrendered Certificate, and no cash payment in lieu of
     fractional shares shall be paid to any such holder, until the holder shall
     surrender such Certificate as provided in this Section 2.3.  Subject to the
     effect of Applicable Laws (as defined in Section 4.9), following surrender
     of any such Certificate, there shall be paid to the holder of the
     certificates representing whole shares of Parent Common Stock issued in
     exchange therefor, without interest, (i) at the time of such surrender, the
     amount of dividends or other distributions with a record date after the
     Effective Time theretofore payable with respect to such whole shares of
     Parent Common Stock and not paid, less the

                                       5
<PAGE>
 
     amount of any withholding taxes which may be required thereon, and (ii) at
     the appropriate payment date subsequent to surrender, the amount of
     dividends or other distributions with a record date after the Effective
     Time but prior to surrender and a payment date subsequent to surrender
     payable with respect to such whole shares of Parent Common Stock, less the
     amount of any withholding taxes which may be required thereon.

          (d) No Further Ownership Rights in Unit Common Stock.  All shares of
              ------------------------------------------------                
     Parent Common Stock issued upon surrender of Certificates in accordance
     with the terms hereof (including any cash paid pursuant to this Article II)
     shall be deemed to have been issued in full satisfaction of all rights
     pertaining to such shares of Unit Common Stock represented thereby, and
     there shall be no further registration of transfers on the stock transfer
     books of Unit of shares of Unit Common Stock 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 as provided in this Section 2.3.

          (e) Termination of Exchange Fund.  Any portion of the Exchange Fund
              ----------------------------                                   
     which remains undistributed to Unit Shareholders twelve months after the
     date of the mailing required by Section 2.3(b) shall be delivered to
     Parent, upon demand therefor, and holders of Certificates previously
     representing shares of Unit Common Stock who have not theretofore complied
     with this Section 2.3 shall thereafter look only to Parent for payment of
     any claim to shares of Parent Common Stock or cash in lieu of fractional
     shares thereof, or dividends or distributions, if any, in respect thereof.

          (f) No Liability.  None of Parent, Sub, the Surviving Corporation or
              ------------                                                    
     the Exchange Agent shall be liable to any person in respect of any shares
     of Unit Common Stock (or dividends or distributions with respect thereto)
     or cash from the Exchange Fund properly delivered to a public official
     pursuant to any applicable abandoned property, escheat or similar law.

          (g) Investment of Exchange Fund.  The Exchange Agent shall invest any
              ---------------------------                                      
     cash included in the Exchange Fund, as directed by Parent, on a daily
     basis.  Any interest and other income resulting from such investments shall
     be paid to Parent upon termination of the Exchange Fund pursuant to Section
     2.3(e).

     2.4  Treatment of Stock Options and Warrants.  At the Effective Time, such
          ---------------------------------------                              
outstanding options and warrants to purchase shares of Unit Common Stock that
(a) were granted prior to the date of this Agreement (which options and warrants
are described on Schedule 2.4 hereto and referred to herein as the "Unit
Options" and the "Unit Warrants," respectively), and (b) are unexpired and
unexercised as of the Effective Time shall be automatically converted into an
option (a "Parent Exchange Option") or a warrant (a "Parent Exchange Warrant"),
as the case may be, to purchase (x) the number of shares of Unit Common Stock
issuable immediately as of the date of this Agreement upon exercise of

                                       6
<PAGE>
 
such Unit Option or Unit Warrant multiplied by (y) the Exchange Ratio, with an
exercise price equal to the exercise price which existed under the corresponding
Unit Option or Unit Warrant divided by the Exchange Ratio, and with such other
terms and conditions, subject to Parent's approval, as were in effect under such
Unit Option or Unit Warrant as of the date of this Agreement.

                                  ARTICLE III
              REPRESENTATIONS AND WARRANTIES OF PARENT AND SUBCORP

     In order to induce Unit to enter into this Agreement, Parent and Subcorp
hereby represent and warrant to Unit as follows:

     3.1  Organization and Standing.  Parent and Subcorp are corporations duly
          -------------------------                                           
organized, validly existing and in good standing under the laws of their
respective jurisdictions of organization and each has the corporate power and
authority to own or lease its properties, and carry on its business.  Parent is
not in violation of its Restated Certificate of Incorporation, as amended (the
"Parent Certificate"), or its Restated Bylaws (the "Parent Bylaws"), and Subcorp
is not in violation of its Amended and Restated Certificate of Incorporation or
Bylaws.  Parent has heretofore furnished to Unit a complete and correct copy of
the Parent Certificate and Parent Bylaws.

     3.2  Corporate Power and Authority.  Each of Parent and Subcorp has all
          -----------------------------                                     
requisite corporate power and authority to enter into and deliver this
Agreement, to perform its obligations hereunder and to consummate the
transactions contemplated by this Agreement.  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 each of Parent
and Subcorp.  This Agreement has been duly executed and delivered by each of
Parent and Subcorp, and constitutes the legal, valid and binding obligation of
each of Parent and Subcorp enforceable against each of them in accordance with
its terms, except as such enforceability may be limited by (a) bankruptcy,
insolvency, reorganization, moratorium or other similar laws affecting or
relating to creditors' rights generally and (b) the availability of injunctive
relief and other equitable remedies.

     3.3  Capitalization of Parent and Subcorp.  As of June 26, 1998, Parent's
          ------------------------------------                                
authorized capital stock consisted solely of (i) 300,000,000 shares of common
stock, par value $.01 per share ("Parent Common Stock"), of which 161,565,388
shares were issued and outstanding, and (ii) 3,000,000 shares of Preferred
Stock, par value $.10 per share, none of which was issued and outstanding or
reserved for issuance.  The Parent Common Stock to be issued to the Unit
Shareholders pursuant to this Agreement will be duly authorized, validly issued,
fully paid and nonassessable and not subject to preemptive rights or rights of
first refusal.  Subcorp's authorized capital stock consists solely of 1,000
shares of Common Stock, par value $.01 per share ("Subcorp Common Stock"), of
which, as of the date hereof, 1,000 shares were issued and outstanding.  As of
the date hereof, all of the outstanding shares of Subcorp Common Stock are
owned, beneficially and of record, by Parent free and clear of any liens, claims
or encumbrances.

                                       7
<PAGE>
 
     3.4  Brokerage and Finder's Fees.  Except for Parent's obligations to
          ---------------------------                                     
Societe Generale Investment Banking, neither Parent nor any shareholder,
director, officer or employee thereof has incurred or will incur on behalf of
Parent any brokerage, finder's or similar fee in connection with the
transactions contemplated by this Agreement.

     3.5  Conflicts; Consents and Approvals.  Neither the execution and delivery
          ---------------------------------                                     
of this Agreement by Parent or Subcorp nor the consummation of the transactions
contemplated hereby will:

          (a) conflict with, or result in a breach of any provision of the
     Parent Certificate or Parent Bylaws or the Amended and Restated Certificate
     of Incorporation or Bylaws of Subcorp;

          (b) violate, or conflict with, or result in a breach of any provision
     of, or constitute a default (or an event which, with the giving of notice,
     the passage of time or otherwise, would constitute a default) under, or
     entitle any party (with the giving of notice, the passage of time of
     otherwise) to terminate, accelerate, modify or call a default under, or
     result in the creation of any lien, security interest, charge or
     encumbrance upon any of the properties or assets of Parent or any of its
     subsidiaries under, any of the terms, conditions or provisions of any note,
     bond, mortgage, indenture, deed of trust, license, contract, undertaking,
     agreement, lease or other instrument or obligation to which Parent or any
     of its subsidiaries is a party;

          (c) violate any order, writ, injunction, decree, statute, rule or
     regulation applicable to Parent or any of its subsidiaries or any of their
     respective properties or assets; or

          (d) require any action or consent or approval of, or review by, or
     registration or filing by Parent or any of its affiliates with, any third
     party or any local, domestic, foreign or multi-national court, arbitral
     tribunal, administrative agency or commission or other governmental or
     regulatory body, agency, instrumentality or authority (a "Governmental
     Authority"), other than (i) authorization for inclusion of the shares of
     Parent Common Stock to be issued in the Merger and the transactions
     contemplated hereby on the NYSE, subject to official notice of issuance,
     (iii) actions required by the Hart-Scott-Rodino Antitrust Improvements Act
     of 1976, as amended, and the rules and regulations promulgated thereunder
     (the "HSR Act"), or any applicable foreign antitrust law, or (iv)
     registrations or other actions required under federal and state securities
     laws as are contemplated by this Agreement.

     3.6  Reorganization.  Neither Parent nor any of its affiliates has taken or
          --------------                                                        
agreed to take any action that (without giving effect to any actions taken or
agreed to be taken by Unit or any of its affiliates) would prevent the Merger
from constituting a reorganization qualifying under the provisions of Section
368(a) of the Code.

                                       8
<PAGE>
 
     3.7  Parent SEC Documents.  Parent has timely filed with the Commission all
          --------------------                                                  
forms, reports, schedules, statements and other documents required to be filed
by it since January 1, 1996 under the Exchange Act or the Securities Act of
1933, as amended (the "Securities Act") (such documents, as supplemented and
amended since the time of filing, collectively, the "Parent SEC Documents").
The Parent SEC Documents, including, without limitation, any financial
statements or schedules included therein, at the time filed (and, in the case of
registration statements and proxy statements, on the dates of effectiveness and
the dates of mailing, respectively) (a) did not contain any untrue statement of
a material fact or omit to state a material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, and (b) complied in
all material respects with the applicable requirements of the Exchange Act and
the Securities Act, as the case may be.  The financial statements of Parent
included in the Parent SEC Documents at the time filed (and, in the case of
registration statements and proxy statements, on the dates of effectiveness and
the dates of mailing, respectively) complied as to form in all material respects
with applicable accounting requirements and with the published rules and
regulations of the Commission with respect thereto, were prepared in accordance
with generally accepted accounting principles applied on a consistent basis
during the periods involved (except as may be indicated in the notes thereto or,
in the case of unaudited statements, as permitted by Form 10-Q of the
Commission), and fairly present (subject in the case of unaudited statements to
normal, recurring audit adjustments) the consolidated financial position of
Parent and its consolidated subsidiaries as at the dates thereof and the
consolidated results of their operations and cash flows for the periods then
ended.

     3.8  Disclosure.  None of the representations or warranties of Parent
          ----------                                                      
contained herein is false or misleading in any material respect or omits to
state a fact herein necessary to make the statements herein or therein not
misleading in any material respect.

                                   ARTICLE IV
                     REPRESENTATIONS AND WARRANTIES OF UNIT

     In order to induce Subcorp and Parent to enter into this Agreement, and
except as disclosed in the Unit SEC Documents (as defined in Section 4.6 below)
or in the disclosure schedules delivered by Unit to Parent and dated the date
hereof (the "Unit Disclosure Schedules"), all of which are incorporated in each
of the following statements as exceptions thereto, Unit hereby represents and
warrants to Parent and Subcorp as follows:

     4.1  Organization and Standing.  Unit is a corporation duly organized,
          -------------------------                                        
validly existing and in good standing under the laws of the State of California
with full corporate power and authority to own, lease, use and operate its
properties and to conduct its business as and where now owned, leased, used,
operated and conducted.  Each of Unit and each subsidiary of Unit is duly
qualified to do business and in good standing in each jurisdiction in which the
nature of the business conducted by it or the property it owns, leases or
operates requires it to so qualify.  Unit is not in violation of any provision
of its Articles of Incorporation, as amended and restated (the "Unit Articles"),
or its Bylaws, as in effect on

                                       9
<PAGE>
 
the date hereof (the "Unit Bylaws").  Unit has heretofore furnished to Parent a
complete and correct copy of the Unit Articles and the Unit Bylaws.

     4.2  Subsidiaries.  Unit does not own, directly or indirectly, any equity
          ------------                                                        
or other ownership interest in any corporation, partnership, joint venture or
other entity or enterprise, except for the subsidiaries and other entities set
forth in Section 4.2 to the Unit Disclosure Schedule.  Except as set forth in
Section 4.2 to the Unit Disclosure Schedule, Unit owns directly or indirectly
each of the outstanding shares of capital stock (or other ownership interests
having by their terms ordinary voting power to elect a majority of directors or
others performing similar functions with respect to such subsidiary) of each of
Unit's subsidiaries.  Each of the outstanding shares of capital stock of each of
Unit's subsidiaries is duly authorized, validly issued, fully paid and
nonassessable, and is owned, directly or indirectly, by Unit free and clear of
all liens, pledges, security interests, claims or other encumbrances.  Other
than as set forth in Section 4.2 to the Unit Disclosure Schedule, there are no
outstanding subscriptions, options, warrants, puts, calls, agreements,
understandings, claims or other commitments or rights of any type relating to
the issuance, sale or transfer of any securities of any subsidiary of Unit, nor
are there outstanding any securities which are convertible into or exchangeable
for any shares of capital stock of any subsidiary of Unit, and neither Unit nor
any subsidiary of Unit has any obligation of any kind to issue any additional
securities of any subsidiary of Unit or to pay for or repurchase any securities
of any subsidiary of Unit or any predecessor thereof.

     4.3  Corporate Power and Authority.  Unit has all requisite corporate power
          -----------------------------                                         
and authority to enter into and deliver this Agreement, to perform its
obligations hereunder and, subject to approval of the Merger by the Unit
Shareholders, to consummate the transactions contemplated by this Agreement.
The execution and delivery of this Agreement by Unit have been duly authorized
by all necessary corporate action on the part of Unit, subject to approval of
the Merger and the transactions contemplated hereby by Unit Shareholders.  This
Agreement has been duly executed and delivered by Unit and constitutes the
legal, valid and binding obligation of Unit enforceable against it in accordance
with its terms, except as such enforceability may be limited by (a) bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting or relating to
creditors' rights generally and (b) the availability of injunctive relief and
other equitable remedies.

     4.4  Capitalization of Unit.  Unit's authorized capital stock consists
          ----------------------                                           
solely of (a) 12,000,000 shares of common stock, par value $.15 per share ("Unit
Common Stock"), of which as of June 25, 1998, 3,995,118 shares were issued and
outstanding.  Except for 975,214 shares of Unit Common Stock reserved for
issuance upon the exercise of outstanding options, no shares of Unit capital
stock are reserved for issuance upon the exercise of outstanding options or
warrants, or for the conversion or exchange of convertible or exchangeable
securities.  No shares of Unit capital stock are held in treasury or by
subsidiaries of Unit.  Each outstanding share of Unit capital stock is duly
authorized and validly issued, fully paid and nonassessable, and has not been
issued in violation of any preemptive or similar rights.  Other than as set
forth in Section 4.4 to the Unit Disclosure Schedule, there are no outstanding
subscriptions, options, warrants, puts, calls, agreements,

                                       10
<PAGE>
 
understandings, claims or other commitments or rights of any type relating to
the issuance, sale, repurchase or transfer by Unit of any securities of Unit,
nor are there outstanding any securities which are convertible into or
exchangeable for any shares of capital stock of Unit, and neither Unit nor any
subsidiary of Unit has any obligation of any kind to issue any additional
securities or to pay for or repurchase any securities of Unit or any
predecessor.  Unit has no agreement, arrangement or understandings to register
any securities of Unit or any of its subsidiaries under the Securities Act or
under any state securities law and has not granted registration rights to any
person or entity (other than agreements, arrangements or understandings with
respect to registration rights that are no longer in effect as of the date of
this Agreement).

     4.5  Conflicts; Consents and Approvals.  Neither the execution and delivery
          ---------------------------------                                     
of this Agreement by Unit, nor the consummation by Unit of the transactions
contemplated hereby or thereby, nor Unit's performance of and compliance with
the terms hereof, will:

          (a) conflict with, or result in a breach of any provision of, the Unit
     Articles or the Unit Bylaws;

          (b) violate, or conflict with, or result in a breach of any provision
     of, or constitute a default (or an event which, with the giving of notice,
     the passage of time or otherwise, would constitute a default) under, or
     entitle any party (with the giving of notice, the passage of time or
     otherwise) to terminate, accelerate, modify or call a default under, or
     result in the creation of any lien, security interest, charge or
     encumbrance upon any of the capital stock, properties or assets of Unit
     under, any of the terms, conditions or provisions of any note, bond,
     mortgage, indenture, deed of trust, license, contract, undertaking,
     agreement, lease or other instrument or obligation to which Unit or any of
     its subsidiaries is a party, or result in the creation, maturation or
     acceleration of any liability or obligation of Unit (or give to any other
     person the right to cause such a creation, maturation or acceleration);

          (c) violate any order, writ, injunction, decree, statute, rule or
     regulation applicable to Unit or any of its subsidiaries or any of their
     respective properties or assets; or

          (d) require any action or consent or approval of, or review by, or
     registration or filing by Unit or any of its affiliates with, any third
     party or any court, arbitral tribunal, administrative agency or commission,
     or any other governmental or regulatory body, agency, instrumentality or
     authority (a "Governmental Authority"), other than (i) approval of the
     Merger and the transactions contemplated hereby by Unit Shareholders and
     filing of the Merger Agreement with the California Secretary of State, (ii)
     actions required by the HSR Act, and (iii) registrations or other actions
     required under federal and state securities laws as are contemplated by
     this Agreement.

                                       11
<PAGE>
 
     4.6  Unit SEC Documents.  Since October 1, 1995, Unit has timely filed with
          ------------------                                                    
the Commission all forms, reports, schedules, statements and other documents
required to be filed by it under the Exchange Act or the Securities Act (such
documents, as supplemented and amended since the time of filing, collectively,
the "Unit SEC Documents").  The Unit SEC Documents, including, without
limitation, any financial statements or schedules included therein, at the time
filed (and, in the case of registration statements and proxy statements, on the
dates of effectiveness and the dates of mailing, respectively) (a) did not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading, and (b) complied in all material respects with the applicable
requirements of the Exchange Act and the Securities Act, as the case may be.
The financial statements of Unit included in the Unit SEC Documents at the time
filed (and, in the case of registration statements and proxy statements, on the
dates of effectiveness and the dates of mailing, respectively) complied as to
form in all material respects with applicable accounting requirements and with
the published rules and regulations of the Commission with respect thereto, were
prepared in accordance with generally accepted accounting principles applied on
a consistent basis during the periods involved (except as may be indicated in
the notes thereto or, in the case of unaudited statements, as permitted by Form
10-Q of the Commission), and, taken as a whole, fairly present the consolidated
financial position of Unit and its consolidated subsidiaries as at the dates
thereof and the consolidated results of their operations and cash flows for the
periods then ended.

     4.7  No Material Adverse Change.  Except as disclosed in Section 4.7 to the
          --------------------------                                            
Unit Disclosure Schedule or as may be disclosed by Unit pursuant to and in
accordance with Section 6.3(d) of this Agreement, since February 28, 1998, there
has been no change in the business, assets, condition (financial or other),
results of operations or prospects of Unit which would constitute a Material
Adverse Effect on Unit or any event, occurrence or development which would have
a material adverse effect on the ability of Unit to consummate the Merger.
Notwithstanding the foregoing sentence, since February 28, 1998, except as
disclosed in Section 4.7 of the Unit Disclosure Schedule or as may be disclosed
by Unit pursuant to and in accordance with Section 6.3(d) of this Agreement,
there has not been any: (i) material adverse change in the financial condition,
assets, liabilities, net worth, earning power, business or prospects of Unit;
(ii) damage or destruction to any material asset of Unit, whether or not covered
by insurance; (iii) strike or other labor trouble at Unit; (iv) creation of any
encumbrance on any asset of Unit; (v) declaration or payment of any dividend or
other distribution on or with respect to or redemption or purchase by Unit of
any shares of capital stock of Unit, including any Unit Common Stock; (vi)
increase in the salary, wage or bonus of any managerial employee of Unit except
those done in the normal course of business for periodic raises in accordance
with past business practices, or any increase in the number of such employees;
(vii) asset acquisition or expenditure in excess of $100,000 individually or
$500,000 in the aggregate, other than the purchase of inventory in the ordinary
course of business; (viii) change in any Plan (as defined in Section 4.16); (ix)
change in any method of accounting; (x) disposition of any asset (other than
inventory in the ordinary course of business) for less than fair market value;
(xi) payment, prepayment or discharge of any liability other than in the
ordinary course of business or any failure to pay

                                       12
<PAGE>
 
any liability when due; (xii) write-offs or write-downs of any assets of Unit;
(xiii) creation, termination or amendment of, or waiver of any right under, any
material agreement of Unit; or (xv) agreement or commitment to do any of the
foregoing.

     4.8  Taxes.  Except as set forth in Section 4.8 to the Unit Disclosure
          -----                                                            
Schedule or disclosed in the Unit SEC Documents:

          (a) Unit and its subsidiaries (i) have duly filed all federal, state,
     local and foreign income, franchise, excise, real and personal property and
     other Tax Returns and reports (including, but not limited to, those filed
     on a consolidated, combined or unitary basis) required to have been filed
     by Unit or its subsidiaries prior to the date hereof; (ii) have within the
     time and manner prescribed by Applicable Law (as defined in Section 4.9)
     paid or, prior to the Effective Time, will pay all Taxes, interest and
     penalties required to be paid pursuant to such returns or reports; and
     (iii) have adequate reserves on their financial statements for any Taxes in
     excess of the amounts so paid.  Neither Unit nor any of its subsidiaries is
     the subject of any currently ongoing Tax audit.  As of the date of this
     Agreement, there are no pending requests for waivers of the time to assess
     any Tax, other than those made in the ordinary course and for which payment
     has been made or there are adequate reserves.  With respect to any taxable
     period ended prior to May 31, 1994, all income Tax Returns (whether
     federal, state, local, foreign or otherwise) including Unit or any of its
     subsidiaries have been audited by the applicable taxing authority or are
     closed by the applicable statute of limitations.  Neither Unit nor any of
     its subsidiaries has waived any statute of limitations in respect of Taxes
     or agreed to any extension of time with respect to a Tax assessment or
     deficiency.  There are no liens with respect to Taxes upon any of the
     properties or assets, real or personal, tangible or intangible, of Unit or
     any of its subsidiaries.  Unit has not filed an election under Section
     341(f) of the Code to be treated as a consenting corporation.  No claim has
     been made by any taxing authority of a jurisdiction where Unit or any of
     its subsidiaries does not file Tax Returns that Unit or such subsidiary, as
     the case may be, is or may be subject to taxation in that jurisdiction.

          (b) Neither Unit nor any of its subsidiaries is obligated by any
     contract, agreement or other arrangement to indemnify any other person with
     respect to Taxes.  Neither Unit nor any of its subsidiaries are now or have
     ever been a party to or bound by any agreement or arrangement (whether or
     not written and including, without limitation, any arrangement required or
     permitted by law) binding Unit or any of its subsidiaries which (i)
     requires Unit or any of its subsidiaries to make any Tax payment to or for
     the account of any other person, or (ii) affords any other person the
     benefit of any net operating loss, net capital loss, investment Tax credit,
     foreign Tax credit, charitable deduction or any other credit or Tax
     attribute which could reduce Taxes (including, without limitation,
     deductions and credits related to alternative minimum Taxes) of Unit or any
     of its subsidiaries.

                                       13
<PAGE>
 
          (c) Unit and its subsidiaries have withheld and paid substantially all
     Taxes required to have been withheld and paid in connection with amounts
     paid or owing to any employee, independent contractor, creditor,
     shareholder or other third party.

          (d) "Tax Returns" means returns, reports and forces required to be
     filed with any Governmental Authority of the United States or any other
     jurisdiction responsible for the imposition or collection of Taxes.

          (e) "Taxes" means (i) all taxes (whether federal, state, local or
     foreign) based upon or measured by income and any other tax whatsoever,
     including, without limitation, gross receipts, profits, sales, use,
     occupation, value added, ad valorem, transfer, franchise, withholding,
     payroll, employment, excise, or property taxes, together with any interest
     or penalties imposed with respect thereto and (ii) any obligations under
     any agreements or arrangements with respect to any taxes described in
     clause (i) above.

     4.9  Compliance with Law.  Unit is in compliance, and at all times since
          -------------------                                                
June 1, 1995 (and, to the best of Unit's knowledge, at all times prior to such
date) has been in compliance, with all applicable laws, statutes, orders, rules,
regulations or policies promulgated, or judgments, decisions or orders entered
by any Governmental Authority (collectively, "Applicable Laws") relating to Unit
or its business or properties, except where the failure to be in compliance with
such Applicable Laws (individually or in the aggregate) would not reasonably be
expected to have a Material Adverse Effect on Unit or where such non-compliance
has been cured.  Except as disclosed in Section 4.9 to the Unit Disclosure
Schedule, no investigation or review by any Governmental Authority with respect
to Unit is pending, or, to the knowledge of Unit, threatened, nor has any
Governmental Authority indicated in writing an intention to conduct the same.

     4.10 Intellectual Property Rights.  Section 4.10 to the Unit Disclosure
          ----------------------------                                      
Schedule discloses all of the trademark and service mark rights, applications
and registrations, trade names, fictitious names, service marks, logos and brand
names, registered copyrights, copyright applications, letters patent, patent
applications and licenses of any of the foregoing owned or used by Unit in or
applicable to Unit's business.  Unit has the entire right, title and interest in
and to, or has the royalty-free right to use, the intellectual property rights
disclosed on Section 4.10 to the Unit Disclosure Schedule and all other
processes, know-how, show-how, formulae, trade secrets, inventions, discoveries,
improvements, blueprints, specifications, drawings, designs, and other
proprietary rights used in or necessary to Unit's business ("Intellectual
Property"), free and clear of all security interests, liens, and other
encumbrances.  Section 4.10 to the Unit Disclosure Schedule separately discloses
all Intellectual Property under license.  The Intellectual Property is valid and
not the subject of any interference, opposition, reexamination or cancellation.
There has not been any written assertion or claim against Unit challenging the
validity or the use by Unit of any of the foregoing.  To the best knowledge of
Unit, after due inquiry, the conduct of the businesses of Unit as currently
conducted does not conflict with or infringe upon any patent, patent right,
license, trademark, trademark right, trade dress, trade name, trade name right,
service

                                       14
<PAGE>
 
mark or copyright of any third party.  To the best knowledge of Unit, after due
inquiry, there are no infringements of any of the Intellectual Property owned by
or licensed by or to Unit and the Intellectual Property is not the subject to
any pending Action.

     4.11 Title to and Condition of Properties.  Unit owns or holds under valid
          ------------------------------------                                 
leases all real property, plants, machinery and equipment necessary for the
conduct of the business of Unit as presently conducted.  The buildings,
fixtures, improvements, machinery, equipment, tools, furniture, improvements and
tangible personal property of Unit are in good operating condition and repair
(ordinary wear and tear excepted) and are suitable for the purposes for which
they are used in Unit's business.

     4.12 Registration Statement; Proxy Statement.  None of the information
          ---------------------------------------                          
provided in writing by Unit for inclusion in the Registration Statement at the
time it becomes effective or, in the case of the Proxy Statement, at the date of
mailing and at the date of the Unit Shareholders Meeting, will contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary in order to make the statements therein, in light
of the circumstances under which they were made, not misleading.  The Proxy
Statement and, except for such portions thereof that relate only to Parent and
its subsidiaries, the Registration Statement, will each comply as to form in all
material respects with the provisions of the Securities Act and the Exchange
Act.

     4.13 Litigation.  Except as set forth in Section 4.13 to the Unit
          ----------                                                  
Disclosure Schedule or in the Unit SEC Documents, there is no suit, claim,
action, proceeding or investigation (an "Action") pending or, to the knowledge
of Unit, threatened against Unit and Unit is not subject to any outstanding
order, writ, injunction or decree.

     4.14 Brokerage and Finder's Fees; Expenses.  Except for Unit's obligations
          -------------------------------------                                
to Needham & Company, Inc., neither Unit nor any shareholder, director, officer
or employee thereof, has incurred or will incur on behalf of Unit, any
brokerage, finder's or similar fee in connection with the transactions
contemplated by this Agreement.

     4.15 Reorganization.  Neither Unit nor any of its affiliates has taken or
          --------------                                                      
agreed to take any action that (without giving effect to any actions taken or
agreed to be taken by Parent any of its affiliates) would prevent the Merger
from constituting a reorganization qualifying under the provisions of Section
368(a) of the Code.

     4.16 Employee Benefits.
          ----------------- 

          (a) Benefit Plans; Company Plans.  Section 4.16 of the Unit Disclosure
              ----------------------------                                      
     Schedule discloses all written and unwritten "employee benefit plans"
     within the meaning of Section 3(3) of ERISA, and any other written and
     unwritten profit sharing, pension, savings, deferred compensation, fringe
     benefit, insurance, medical, medical reimbursement, life, disability,
     accident, post-retirement health or welfare benefit, stock option, stock
     purchase, sick pay, vacation, employment, severance, termination or other
     plan, agreement, contract, policy, trust fund or arrangement

                                       15
<PAGE>
 
     (each, a "Benefit Plan"), whether or not funded and whether or not
     terminated, (i) maintained or sponsored by Unit, or (ii) with respect to
     which Unit has or may have liability or is obligated to contribute, or
     (iii) that otherwise covers any of the current or former employees of Unit
     or their beneficiaries, or (iv) as to which any such current or former
     employees or their beneficiaries participated or were entitled to
     participate or accrue or have accrued any rights thereunder (each, a "Unit
     Plan").

          (b) Unit Group Matters; Funding.  Neither Unit nor any corporation
              ---------------------------                                   
     that may be aggregated with Unit under Sections 414(b), (c), (m) or (o) of
     the Code (the "Unit Group") has any obligation to contribute to or any
     direct or indirect liability under or with respect to any Benefit Plan of
     the type described in Sections 4063 and 4064 of ERISA or Section 413(c) of
     the Code.  Unit does not have any liability, and after the Closing Unit
     will not have any liability, with respect to any Benefit Plan of any other
     member of the Unit Group, whether as a result of delinquent contributions,
     distress terminations, fraudulent transfers, failure to pay premiums to
     United States Pension Benefit Guaranty Corporation (the "PBGC"), withdrawal
     liability or otherwise.  No accumulated funding deficiency (as defined in
     Section 302 of ERISA and Section 412 of the Code) exists nor has any
     funding waiver from the IRS been received or requested with respect to any
     Unit Plan or any Benefit Plan of any member of the Unit Group and no excise
     or other Tax is due or owing because of any failure to comply with the
     minimum funding standards of the Code or ERISA with respect to any of such
     plans.

          (c) Compliance.  Each of the Unit Plans and all related trusts,
              ----------                                                 
     insurance contracts and funds have been created, maintained, funded and
     administered in all material respects in compliance with all applicable law
     and in compliance with the plan document, trust agreement, insurance policy
     or other writing creating the same or applicable thereto.  No Unit Plan is
     or is proposed to be under audit or investigation, and no completed audit
     of any Unit Plan has resulted in the imposition of any Tax, fine or
     penalty.

          (d) Qualified Plans.  Section 4.16 of the Unit Disclosure Schedule
              ---------------                                               
     discloses each Unit Plan that purports to be a qualified plan under Section
     401(a) of the Code and exempt from United States federal income tax under
     Section 501(a) of the Code (a "Qualified Plan").  With respect to each
     Qualified Plan, a determination letter (or opinion or notification letter,
     if applicable) has been received from the IRS that such plan is qualified
     under Section 401(a) of the Code and exempt from federal income tax under
     Section 501(a) of the Code.  No Qualified Plan has been amended since the
     date of the most recent such letter.  No member of the Unit Group, nor any
     fiduciary of any Qualified Plan, nor any agent of any of the foregoing, has
     done anything that would adversely affect the qualified status of a
     Qualified Plan or the qualified status of any related trust.

          (e) No Defined Benefit Plans.  No Unit Plan is a defined benefit plan
              ------------------------                                         
     within the meaning of Section 3(35) of ERISA (a "Defined Benefit Plan").
     No

                                       16
<PAGE>
 
     Defined Benefit Plan sponsored or maintained by any member of the Unit
     Group has been terminated or partially terminated after September 1, 1974,
     except as set forth on Schedule 4.16 of the Unit Disclosure Schedule.  Each
     Defined Benefit Plan identified as terminated on Schedule 4.16 of the Unit
     Disclosure Schedule has met the requirement for standard termination of
     single-employer plans contained in Section 4041(b) of ERISA.  During the
     five (5) year period ending on the Closing Date, no member of the Unit
     Group has transferred a Defined Benefit Plan to a corporation that was not,
     at the time of transfer, related to the transferor in any manner described
     in Sections 414(b), (c), (m) or (o) of the Code.

          (f) Multiemployer Plans.  No Unit Plan is a multiemployer plan within
              -------------------                                              
     the meaning of Section 3(37) or Section 4001(a)(3) of ERISA (a
     "Multiemployer Plan").  No member of the Unit Group has withdrawn from any
     Multiemployer Plan or incurred any withdrawal liability to or under any
     Multiemployer Plan.  No Unit Plan covers any employees of any member of the
     Unit Group in any foreign country or territory.

          (g) Prohibited Transactions; Fiduciary Duties; Post-Retirement
              ----------------------------------------------------------
     Benefits.  No prohibited transaction (within the meaning of Section 406 of
     --------                                                                  
     ERISA and Section 4975 of the Code) with respect to any Unit Plan exists or
     has occurred that could subject Unit to any liability or Tax under Part 5
     of Title I of ERISA or Section 4975 of the Code.  No member of the Unit
     Group, nor any administrator or fiduciary of any Unit Plan, nor any agent
     of any of the foregoing, has engaged in any transaction or acted or failed
     to act in a manner that will subject Unit to any liability for a breach of
     fiduciary or other duty under ERISA or any other applicable Law.  With the
     exception of the requirements of Section 4980B of the Code, no post-
     retirement benefits are provided under any Unit Plan that is a welfare
     benefit plan as described in ERISA Section 3(1).

     4.17 Undisclosed Liabilities.  Except as set forth in Section 4.17 of the
          -----------------------                                             
Unit Disclosure Schedule, neither Unit nor any of its subsidiaries has any debt,
obligation or liability, absolute, fixed, contingent or otherwise, of any nature
whatsoever, whether due or to become due, including any unasserted claim,
whether incurred directly or by any predecessor thereto, and whether arising out
of any act, omission, transaction, circumstance, sale of goods or services,
state of facts or other condition, except:  (i) those reflected or reserved
against on the consolidated balance sheets of Unit as of February 28, 1998
included in the Unit SEC Documents in the amounts shown therein; (ii) those not
required under generally accepted accounting principles to be reflected or
reserved against therein and that have arisen in the ordinary course of business
of Unit and have been consistent in amount and character with past practice and
experience of Unit and which, individually or in the aggregate, has not had and
will not have a Material Adverse Effect with respect to Unit.

     4.18 Environmental Matters.  Except as disclosed in Section 4.18 of the
          ---------------------                                             
Unit Disclosure Schedule or in the Unit SEC Documents:

                                       17
<PAGE>
 
          (a) Compliance; No Liability.  Unit has operated its business and each
              ------------------------                                          
     parcel of Real Property, and any real property previously owned, used or
     leased by Unit, in compliance with all applicable Environmental Laws.  Unit
     is not subject to any liability, penalty or expense (including legal fees)
     and will not hereafter suffer or incur any loss, liability, penalty or
     expense (including legal fees) by virtue of any violation of any
     Environmental Law by Unit occurring prior to the Closing.  "Environmental
     Law" means any applicable law or regulation relating to public health and
     safety or protection of the environment, including common law nuisance,
     property damage, and similar common law theories.

          (b) Treatment; CERCLIS.  Unit has not treated, stored, recycled or
              ------------------                                            
     disposed of any hazardous substance as defined by any Environmental Law and
     any other material regulated by any applicable Environmental Law, including
     petroleum-related material, crude oil or any fraction thereof, PCB's, and
     friable asbestos ("Regulated Material") on any real property, and to the
     best of Unit's knowledge, no other Person has treated, stored, recycled or
     disposed of any Regulated Material on any part of the Real Property.  Unit
     has not transported any Regulated Material or arranged for the
     transportation of any Regulated Material to any location that is listed or
     proposed for listing on the National Priorities List pursuant to Superfund,
     on CERCLIS or any other location that is the subject of federal, state or
     local enforcement action or other investigation that may lead to claims
     against Unit for cleanup costs, remedial action, damages to natural
     resources, to other property or for personal injury including claims under
     Superfund.  None of the Real Property is listed or proposed for listing on
     the National Priorities List pursuant to Superfund, CERCLIS or any state or
     local list of sites requiring investigation or cleanup.

          (c) Notices; Existing Claims; Certain Regulated Materials; Storage
              --------------------------------------------------------------
     Tanks.  Unit has not received any request for information, notice of claim,
     -----                                                                      
     demand or other notification that it is or may be potentially responsible
     with respect to any investigation, abatement or cleanup of any threatened
     or actual release of any Regulated Material.  Unit is not required to place
     any notice or restriction relating to the presence of any Regulated
     Material at any Real Property or in any deed to any Real Property.  There
     has been no past, and there is no pending or contemplated, claim by or
     against Unit under any Environmental Law or laws based on actions of others
     that may have impacted on the Real Property, and Unit has not entered into
     any agreement with any person regarding any Environmental Law, remedial
     action or other environmental liability or expense.  All aboveground
     storage tanks and, to the best knowledge of Unit, all underground storage
     tanks located on the Real Property are disclosed on Section 4.18 of the
     Unit Disclosure Schedule, and all such tanks and associated piping are in
     sound condition and are not leaking and have not leaked.

     4.19 Opinion of Financial Advisors.  Unit has received the oral advice of
          -----------------------------                                       
Needham & Company, its financial advisors, to the effect that, as of the date of
this Agreement, the Exchange Ratio is fair to the Unit Shareholders from a
financial point of view.  Such oral advice has not been withdrawn or revoked or
modified in any material

                                       18
<PAGE>
 
respect and is to be confirmed in a written fairness opinion of Needham &
Company, which opinion will be dated as of the date of this Agreement.  Unit
will promptly provide copies of such opinion to Parent.

     4.20 Board Recommendation.  The Board of Directors of Unit, at a meeting
          --------------------                                               
duly called and held, has by unanimous vote of those directors present (a)
determined that this Agreement and the transactions contemplated hereby,
including the Merger, taken together, are fair to and in the best interests of
the Unit Shareholders, and (b) resolved to recommend that the Unit Shareholders
approve this Agreement and the transactions contemplated herein, including the
Merger (the "Unit Board Recommendation").

     4.21 [Intentionally Omitted.]

     4.22 Inventory.  All of the inventory owned by Unit is valued on the books
          ---------                                                            
and records of Unit and in the financial statements contained in the Unit SEC
Documents at lower of cost or market, the cost thereof being determined on a
FIFO basis in accordance with generally accepted accounting principles.  All of
the finished goods inventory of Unit is in good, merchantable and usable
condition and is salable in the ordinary course of business within a reasonable
time and at normal profit margins, and all of the raw materials and work-in-
process inventory of Unit can reasonably be expected to be consumed in the
ordinary course of business within a reasonable period of time.  No material
portion of Unit's inventory is obsolete, slow-moving, has been consigned to
others or is on consignment from others.

     4.23 Receivables.  All trade and other accounts receivable of Unit
          -----------                                                  
("Receivables"), whether reflected on the financial statements contained in the
Unit SEC documents or created after the date of such financial statements, arose
from bona fide sales transactions of Unit, and no portion of any Receivable is
subject to counterclaim, defense or set-off or is otherwise in dispute.  Except
to the extent of the recorded reserve for doubtful accounts, all of the
Receivables are collectible in the ordinary course of business and will be fully
collected within one hundred twenty (120) days after having been created using
commercially reasonable efforts, except for contract reserves and retainages.

     4.24 Permits.  Unit holds all permits, certificates, licenses, franchises,
          -------                                                              
privileges, approvals, registrations and authorizations required under any
applicable law or otherwise advisable in connection with the operation of its
assets and business (each, a "Permit" and collectively, "Permits").  Each Permit
is valid, subsisting and in full force and effect.  Unit is in compliance with
and has fulfilled and performed its obligations under each Permit, and, no event
or condition or state of facts exists (or would exist upon the giving of notice
or lapse of time or any of them) that could constitute a breach or default under
any Permit. Unit has not received any notice of non-renewal of any Permit.

     4.25 Real Property.  Section 4.25 of the Unit Disclosure Schedule
          -------------                                               
identifies all real properties currently owned, used or leased by Unit or in
which Unit has an interest (collectively, the "Real Property") and identifies
the record title holder of all of the Real

                                       19
<PAGE>
 
Property.  Unit has good and marketable fee simple title to (or a leasehold
interest in, as the case may be) all Real Property shown as owned by it on
Section 4.25 of the Unit Disclosure Schedule, free and clear of all liens and
other encumbrances, other than (i) easements, covenants, rights-of-way and other
encumbrances or restrictions of record, (ii) zoning restrictions, and (iii)
liens for current taxes not yet due, provided that any such encumbrance in
clauses (i), (ii) and (iii) does not either adversely affect the value of the
Real Estate or prohibit or interfere with the operations of Unit's business.
Unit has the right to quiet enjoyment of all Real Property in which it holds a
leasehold interest for the full term, including all renewal rights, of the lease
or similar agreement relating thereto.  Copies of all title insurance policies
written in favor of Unit and all surveys in Unit's possession relating to the
Real Property owned or leased by Unit have been delivered to Parent.  All
structures and other improvements on all Real Property owned by Unit are within
the lot lines and do not encroach on the properties of any other person, and the
use and operation of all Real Property conform to all applicable building,
zoning, safety and subdivision laws, environmental laws and other laws, and all
restrictive covenants and restrictions and conditions affecting title.  Unit has
not received any written or oral notice of assessments for public improvements
or condemnation against any Real Property.

     4.26 Labor Relations.  No employee of Unit is represented by any union or
          ---------------                                                     
other labor organization.  No representation election, arbitration proceeding,
grievance, labor strike, dispute, slowdown, stoppage or other labor trouble is
pending or threatened against Unit.  No complaint against Unit is pending or
threatened before the National Labor Relations Board, the Equal Employment
Opportunity Commission or any similar state or local agency, by or on behalf of
any employee of Unit.  Unit has no contingent liability for sick leave, vacation
time, severance pay or any similar item other than that which has been
adequately reserved against on the February 28, 1998 balance sheet of Unit.
Unit has no contingent liability for any occupational disease of any of its
employees, former employees or others, other than that which has been adequately
reserved against on the February 28, 1998 balance sheet of Unit.

     4.27 Products Liability; Warranties.
          ------------------------------ 

          (a) Section 4.27 of the Unit Disclosure Schedule (i) sets forth Unit's
     warranty expense for each of Unit's last three (3) fiscal years ended May
     30, 1998, and (ii) describes Unit's product return policy and the form of
     all warranties given or made by Unit with respect to products sold by Unit
     since October 1, 1995.

          (b) Unit has not been required to file any notification or other
     report with, nor has Unit been required to provide information to, any
     product safety commission, agency, board or other governmental authority or
     any jurisdiction concerning actual or potential hazards with respect to any
     product manufactured or sold by Unit.

          (c) Unit has not failed to obtain approval of any product or component
     which is used, manufactured or licensed by Unit in the conduct of its
     business and

                                       20
<PAGE>
 
     which is required to be approved by any independent or government-sponsored
     testing laboratory, industry trade association or similar body, agency or
     association.

          (d) Except as disclosed on Section 4.27 of the Unit Disclosure
     Schedule, there is no fact or event which has occurred at any time since
     June 1, 1995 (or, to the best of Unit's knowledge, prior to such date)
     which has formed or could reasonably be expected to form the basis of any
     claim against Unit, whether or not covered by insurance, for products
     liability or for breach of any express or implied product warranty, other
     than warranty claims asserted by customers in the ordinary course of
     business and consistent with Unit's past experience as set forth on Section
     4.27 of the Unit Disclosure Schedule.  The reserves taken by Unit for
     warranty expenses, as reflected on Unit's financial statements contained in
     the Unit SEC Documents, are adequate to cover warranty claims asserted by
     customers in the ordinary course of business.

     4.28 Insurance.  Section 4.28 of the Unit Disclosure Schedule discloses all
          ---------                                                             
insurance policies with respect to which Unit is the owner, insured or
beneficiary.  Such policies are reasonable, in both scope and amount, in light
of the risks attendant to Unit's business.  Unit will not have any liability
after the Closing for retrospective or retroactive premium adjustments, except
as disclosed in Section 4.28 of the Unit Disclosure Schedule.  For the past five
(5) years, all insurance policies covering products liability and general
liability maintained by or for the benefit of Unit have been "claims made"
policies.  Section 4.28 of the Unit Disclosure Schedule discloses the manner in
which Unit provides coverage for workers' compensation claims.

     4.29 Customer Relations.
          ------------------ 

          (a) Section 4.29 to the Unit Disclosure Schedule identifies (i) Unit's
     ten (10) largest customers during fiscal 1998 in terms of the proportion of
     Unit's revenue represented by such customers (each a "Major Customer") and
     (ii) each supplier or vendor which is the sole supplier or vendor to Unit
     of any supply or material used by Unit in its business (a "Sole Source
     Provider").

          (b) To Unit's knowledge, no facts exist relating to any Major Customer
     or Sole Source Provider that could reasonably be expected to have a
     material adverse effect on Unit's relationship with such Major Customer or
     Sole Source Provider or otherwise have a Material Adverse Effect on Unit or
     its business.

     4.30 Contracts; Compliance.  Section 4.30 to the Unit Disclosure Schedule
          ---------------------                                               
identifies each contract, lease, indenture, mortgage, instrument, commitment or
other agreement, arrangement or understanding, oral or written, formal or
informal, to which Unit is a party or by which it or its assets may be affected,
except for service agreements whose annual contract price is less than $100,000
and that (i) is material to Unit's business or Unit's assets or operations,
individually or in the aggregate, (ii) involves the purchase, sale or lease of
any asset, materials, supplies, inventory or services in excess of $100,000 per

                                       21
<PAGE>
 
year, (iii) has an unexpired term of more than one (1) year from the date
hereof, taking into account the effect of any renewal options, (iv) relates to
the borrowing or lending of any money or guarantee of any obligation, (v) limits
the right of Unit to compete in any line of business or otherwise restricts any
right Unit may have, (vi) is an employment or consulting contract involving
payment of compensation and benefits, (vii) is a confidentiality or non-
disclosure agreement or other agreement relating to Unit's trade secrets,
confidential information, or the protection of Unit's intellectual property, or
(viii) was not entered into in the ordinary course (each, a "Contract" and
collectively, the "Contracts").  Each Contract is a legal, valid and binding
obligation of Unit and is in full force and effect.  Unit and each other party
to each Contract has performed all obligations required to be performed by it
thereunder and is not in breach or default, and is not alleged to be in breach
or default, in any respect thereunder, and no event has occurred and no
condition or state of facts exists (or would exist upon the giving of notice or
the lapse of time or any of them) that would become or cause a breach, default
or event of default thereunder, would give to any person the right to cause such
a termination or would cause an acceleration of any obligation thereunder.  Unit
is not currently renegotiating any Contract in excess of $100,000, except as
those Contracts identified as such on Section 4.30 of the Unit Disclosure
Schedule, nor has Unit received any notice of non-renewal or price increase or
sales or production allocation with respect to any Contract.

     4.31 Year 2000.  To Unit's knowledge, (i) no material modifications are
          ---------                                                         
required to any of Unit's computer systems or computer software to assure that
such systems and software contain no deficiencies relating to formatting for
entering dates (commonly referred to and referred herein as the "Year 2000
Problem"); (ii) Unit's computer systems and software in all material respects
are susceptible to all necessary modification and Unit has adequate personnel or
consultants under contract or other available means to timely modify (or, as
applicable, replace and/or upgrade) its own computer systems and software.  Unit
is not aware of any inability on the part of any of its customers, insurance
providers or vendors to timely address the Year 2000 Problem that will in any
manner materially adversely affect Unit's business operations.

     4.32 Disclosure.  None of the representations or warranties of Unit
          ----------                                                    
contained herein and none of the information contained in the Unit Disclosure
Schedule is false or misleading in any material respect or omits to state a fact
herein or therein necessary to make the statements herein or therein not
misleading in any material respect.

                                   ARTICLE V
                            COVENANTS OF THE PARTIES

     The parties hereto agree that:

     5.1  Mutual Covenants.
          ---------------- 

          (a) Hart-Scott-Rodino; Reasonable Efforts.
              ------------------------------------- 

                                       22
<PAGE>
 
              (i)  The parties agree to use their reasonable efforts to take all
     actions necessary to comply with the HSR Act and to make all necessary
     filings with applicable authorities thereunder.

              (ii) The parties further agree to use reasonable efforts to take,
     or cause to be taken, all actions, and to do, or cause to be done, and to
     assist and cooperate with the other parties in doing, all things necessary,
     proper or advisable to consummate and make effective, in the most
     expeditious manner practicable, the Merger and the other transactions
     contemplated by this Agreement, including (A) the obtaining of all other
     necessary actions or nonactions, waivers, consents, licenses, permits,
     authorizations, orders and approvals from Governmental Authorities and the
     making of all other necessary registrations and filings, (B) the obtaining
     of all consents, approvals or waivers from third parties related to or
     required in connection with the Merger that are necessary to consummate the
     Merger and the transactions contemplated by this Agreement or required to
     prevent a Material Adverse Effect on Parent or Unit from occurring prior to
     or after the Effective Time, (C) the preparation of the Proxy Statement,
     the Prospectus and the Registration Statement, (D) the taking of all action
     necessary to ensure that it is a "poolable entity" eligible to participate
     in a transaction to be accounted for as a pooling of interests for
     financial reporting purposes and to ensure that the Merger constitutes a
     tax-free reorganization within the meaning of Section 368(a)(1)(A), (E) the
     satisfaction of all conditions precedent to the parties' obligations
     hereunder, and (F) the execution and delivery of any additional instruments
     necessary to consummate the transactions contemplated by, and to fully
     carry out the purposes of, this Agreement.  Notwithstanding the foregoing
     or any other provision of this Agreement, nothing in this Section 5.1(a)
     shall limit a party's right to terminate this Agreement pursuant to Section
     7.1, so long as such party has up to then complied with its obligations
     under this Section 5.1(a).

          (b) Tax-Free Treatment.  Each of the parties shall use its best
              ------------------                                         
     efforts to cause the Merger to constitute a tax-free "reorganization" under
     Section 368(a) of the Code and to cooperate with one another in obtaining
     an opinion to Unit from Stradling Yocca Carlson & Rauth ("Stradling,
     Yocca"), counsel to Unit, as provided for in Section 6.2(d).  In connection
     therewith, each of Parent and Unit shall deliver to Stradling, Yocca
     representation letters and Unit shall use all reasonable efforts to obtain
     representation letters from appropriate shareholders of Unit and shall
     deliver any such letters obtained to Stradling, Yocca in each case in form
     and substance reasonably satisfactory to Stradling, Yocca.

          (c) Public Announcements.  The initial press release concerning the
              --------------------                                           
     Merger and the transactions contemplated hereby shall be a joint press
     release.  Unless otherwise required by Applicable Laws or requirements of
     the NYSE (and in that event only if time does not permit), at all times
     prior to the earlier of the Effective Time or termination of this Agreement
     pursuant to Section 7.1, Parent and Unit shall consult with each other
     before issuing any press release with respect to the Merger and shall not
     issue any such press release prior to such consultation.

                                       23
<PAGE>
 
          (d) Pooling-of-Interests.  Each of the parties agrees that it shall
              -------------------- 
     not, and shall not permit any of its subsidiaries to, take any actions
     which would, or would be reasonably likely to, prevent Parent from
     accounting, and shall use reasonable efforts (including, without
     limitation, providing appropriate representation letters to Parent's
     accountants) to allow Parent to account, for the Merger in accordance with
     the pooling-of-interests method of accounting under the requirements of
     Opinion No. 16 "Business Combinations" of the Accounting Principles Board
     of the American Institute of Certified Public Accountants, as amended by
     applicable pronouncements by the Financial Accounting Standards Board, and
     all related published rules, regulations and policies of the Commission
     ("APB No. 16").

     5.2  Covenants of Parent.
          ------------------- 

          (a) Preparation of Registration Statement.  Consistent with the timing
              -------------------------------------                             
     for the Unit Shareholders Meeting, Parent shall prepare and file the
     Registration Statement with the Commission as soon as is reasonably
     practicable following pre-filing of the Proxy Statement by Unit, approval
     by Parent thereof, and clearance thereof by the Commission and shall use
     reasonable efforts to have the Registration Statement declared effective by
     the Commission as promptly as practicable and to maintain the effectiveness
     of the Registration Statement through the Effective Time.  If, at any time
     prior to the Effective Time, Parent shall obtain knowledge of any
     information pertaining to Parent contained in or omitted from the
     Registration Statement that would require an amendment or supplement to the
     Registration Statement or the Proxy Statement, Parent will so advise Unit
     in writing and will promptly take such action as shall be required to amend
     or supplement the Registration Statement and/or the Proxy Statement.
     Parent shall promptly furnish to Unit all information concerning it as may
     be required for the Proxy Statement and any supplements or amendments
     thereto.  Parent shall cooperate with Unit in the preparation of the Proxy
     Statement in a timely fashion and shall use all reasonable efforts to
     assist Unit in clearing the Proxy Statement with the Staff of the
     Commission.  Parent also shall take such other reasonable actions (other
     than qualifying to do business in any jurisdiction in which it is not so
     qualified) required to be taken under any applicable state securities laws
     in connection with the issuance of Shares of Parent Common Stock in the
     Merger.

          (b) Merger Sub.  Prior to the Effective Time, Subcorp shall not
              ----------                                                 
     conduct any business or make any investments other than as specifically
     contemplated by this Agreement and will not have any assets (other than a
     de minimis amount of cash paid to Subcorp for the issuance of its stock to
     Parent) or any material liabilities.

          (c) NYSE Listing.  Parent shall use its reasonable efforts to cause
              ------------                                                   
     the Shares of Parent Common Stock issuable pursuant to the Merger
     (including, without limitation, the Shares of Parent Common Stock issuable
     upon the exercise of the Parent Exchange Options) to be approved for
     listing on the NYSE, subject to official notice of issuance, prior to the
     Effective Time.

                                       24
<PAGE>
 
          (d) Notification of Certain Matters.  Parent shall give prompt notice
              -------------------------------  
     to Unit of (i) the occurrence or non-occurrence of any event the occurrence
     or non-occurrence of which would cause any Parent representation or
     warranty contained in this Agreement to be untrue or inaccurate at or prior
     to the Effective Time in any material respect and (ii) any material failure
     of Parent to comply with or satisfy any covenant, condition or agreement to
     be complied with or satisfied by it hereunder; provided, however, that the
     delivery of any notice pursuant to this Section 5.2(j) shall not limit or
     otherwise affect the remedies available hereunder to Unit.

          (e) Indemnification.  From and after the Effective Time, Parent shall
              ---------------                                                  
     indemnify, defend and hold harmless the present and former officers and
     directors of Unit in respect of acts or omissions occurring prior to the
     Effective Time to the fullest extent permitted by Applicable Law, including
     with respect to taking all actions necessary to advance expenses to the
     extent permitted by Applicable Law.  Parent agrees that (a) the provisions
     of the Articles of Incorporation and Bylaws of the Surviving Corporation or
     any successor entity relating to the indemnification of officers and
     directors shall not be amended so as to make such provisions less favorable
     to the officers and directors of the Surviving Corporation than the
     provisions contained in the Articles of Incorporation and Bylaws of Subcorp
     in effect as of the date hereof, and (b) the Surviving Corporation shall
     not be merged with any other entity unless the provisions of the Articles
     of Incorporation and Bylaws (or equivalent documents) of the surviving
     entity in such merger relating to the indemnification of officers and
     directors are at least as favorable to the officers and directors of the
     Surviving Corporation as the provisions contained in the Articles of
     Incorporation and Bylaws of Subcorp in effect as of the date hereof.  The
     present and former officers and directors of Unit are intended third-party
     beneficiaries of the provisions of this Section as of and following the
     Effective Time.

          (f) Employees and Employee Benefits.
              ------------------------------- 

              (i)   For at least one year from and after the Effective Time,
     Parent and its affiliates shall provide Unit Employees (as defined below)
     with (a) retirement and savings benefits, (b) health and medical benefits,
     (c) severance benefits, and (d) other employee benefits that are, in the
     case of each such category of benefits, no less favorable in the aggregate
     than the comparable benefits provided to comparable employees of Parent and
     its affiliates immediately before the Effective Time.

              (ii)  From and after the Effective Time, Parent shall treat all
     service by Unit Employees (as defined below) with Unit and its affiliates
     and their respective predecessors prior to the Effective Time for all
     purposes as service with Unit (except to the extent such treatment would
     result in duplicative accrual on or after the Closing Date of benefits for
     the same period of service), and, with respect to any medical or dental
     benefit plan in which Unit Employees participate after the Effective Time,
     Parent shall waive or cause to be waived any pre-existing condition
     exclusions and actively-at-work requirements (provided, however, that no
     such waiver shall apply to

                                       25
<PAGE>
 
     pre-existing condition of any Unit Employee who was, as of the Effective
     Time, excluded from participation in a Unit benefit plan by virtue of such
     pre-existing condition), and shall provide that any covered expenses
     incurred on or before the Effective Time by a Unit Employee or a Unit
     Employee's covered dependent shall be taken into account for purposes of
     satisfying applicable deductible, coinsurance and maximum out-of-pocket
     provisions after the Effective Time to the same extent as such expenses are
     taken into account for the benefit of similarly situated employees of
     Parent and subsidiaries of Parent.

              (iii) Nothing in Section 5.2(f) shall be construed to impose upon
     Parent and its affiliates any obligation to continue the employment of any
     Unit Employee following the Effective Time. For purposes of this Section
     5.2(f), "Unit Employees" shall mean persons who are, as of the Effective
     Time, employees of Unit or any of its subsidiaries.

     5.3  Covenants of Unit.
          ----------------- 

          (a) Unit Shareholders Meeting.  Unit shall take all action in
              -------------------------                                
     accordance with the federal securities laws, the CCC, the Unit Articles and
     the Unit Bylaws necessary to convene a special meeting of Unit Shareholders
     (the "Unit Shareholders Meeting") to be held on the date determined by Unit
     and acceptable to Parent, to consider and vote upon approval of the Merger,
     this Agreement and the transactions contemplated hereby, including the Unit
     Board Recommendation to the extent not previously withdrawn in compliance
     with Section 5.3(d).

          (b) Information for the Registration Statement and Preparation of
              -------------------------------------------------------------
     Proxy Statement.  Unit shall promptly furnish Parent with all information
     ---------------                                                          
     concerning it as may be required for inclusion in the Registration
     Statement.  Unit shall cooperate with Parent in the preparation of the
     Registration Statement in a timely fashion and shall use all reasonable
     efforts to assist Parent in having the Registration Statement declared
     effective by the Commission as promptly as practicable consistent with the
     timing for the Unit Shareholders Meeting.  If, at any time prior to the
     Effective Time, Unit obtains knowledge of any information pertaining to
     Unit that would require any amendment or supplement to the Registration
     Statement or the Proxy Statement, Unit shall so advise Parent and shall
     promptly furnish Parent with all information as shall be required for such
     amendment or supplement and shall promptly amend or supplement the Proxy
     Statement and cooperate with Parent to promptly amend or supplement the
     Registration Statement, as the case may be.  Unit shall use all reasonable
     efforts to cooperate with Parent in the preparation and filing of the Proxy
     Statement with the Commission on a confidential basis.  Consistent with the
     timing for the Unit Shareholders Meeting as determined by Unit, Unit shall
     use all reasonable efforts to mail at the earliest practicable date to Unit
     Shareholders the Proxy Statement, which shall include all information
     required under Applicable Law to be furnished to Unit Shareholders in
     connection with the Merger and the transactions contemplated thereby and
     shall include the Unit Board Recommendation

                                       26
<PAGE>
 
     to the extent not previously withdrawn in compliance with Section 5.3(d)
     and the written opinions of Needham & Company, Inc. described in Section
     4.19.

          (c) Conduct of Unit's Operations.  Unit shall conduct its operations
              ----------------------------                                    
     in the ordinary course except as expressly contemplated by this Agreement
     and the transactions contemplated hereby and shall use its best efforts to
     maintain and preserve its business organization and its material rights and
     franchises and to retain the services of its officers and key employees and
     maintain relationships with customers, suppliers, lessees, licensees and
     other third parties, and to maintain all of its operating assets in their
     current condition (normal wear and tear excepted), to the end that its
     goodwill and ongoing business shall not be impaired in any material
     respect.  Without limiting the generality of the foregoing, during the
     period from the date of this Agreement to the Effective Time, Unit shall
     not, except as otherwise expressly contemplated by this Agreement and the
     transactions contemplated hereby, without the prior written consent of
     Parent:

              (i)  do or effect any of the following actions with respect to its
     securities: (A) adjust, split, combine or reclassify its capital stock, (B)
     make, declare or pay any dividend or distribution on, or directly or
     indirectly redeem, purchase or otherwise acquire, any shares of its capital
     stock or any securities or obligations convertible into or exchangeable for
     any shares of its capital stock, (C) grant any person any right or option
     to acquire any shares of its capital stock, (D) issue, deliver or sell or
     agree to issue, deliver or sell any additional shares of its capital stock
     or any securities or obligations convertible into or exchangeable or
     exercisable for any shares of its capital stock or such securities (except
     pursuant to the exercise of Unit Options which are outstanding as of the
     date hereof or which are granted by Unit prior to the Effective Time in
     compliance with the terms of this Agreement), or (E) enter into any
     agreement, understanding or arrangement with respect to the sale, voting,
     registration or repurchase of its capital stock;

              (ii)  directly or indirectly sell, transfer, lease, pledge,
     mortgage, encumber or otherwise dispose of any of its property or assets
     other than in the ordinary course of business;

              (iii) make or propose any changes in the Unit Articles or the
     Unit Bylaws;

              (iv)  merge or consolidate with any other person;

              (v)   incur, create, assume or otherwise become liable for any
     indebtedness for borrowed money or assume, guarantee, endorse or otherwise
     as an accommodation become responsible or liable for the obligations of any
     other individual, corporation or other entity;

                                       27
<PAGE>
 
               (vi)    enter into or modify any employment, severance,
     termination or similar agreements or arrangements with, or grant any
     bonuses, salary increases, severance or termination pay to, any officer,
     director, consultant or employee other than in the ordinary course of
     business consistent with past practice, or otherwise increase the
     compensation or benefits provided to any officer, director, consultant or
     employee except as may be required by Applicable Law or in the ordinary
     course of business consistent with past practice;

               (vii)   enter into, adopt or amend any employee benefit or
     similar plan except as may be required by Applicable Law;

               (viii)  change any method or principle of accounting in a manner
     that is inconsistent with past practice except to the extent required by
     generally accepted accounting principles as advised by Unit's regular
     independent accountants;

               (ix)    take any action that will likely result in any of the
     representations and warranties set forth in Article IV becoming false or
     inaccurate in any material respect;

               (x)     enter into or carry out any other transaction other than
     in the ordinary and usual course of business;

               (xi)    permit or cause any subsidiary to do any of the foregoing
     or agree or commit to do any of the foregoing; or

               (xii)   agree in writing or otherwise to take any of the
     foregoing actions.

          (d)  No Solicitation.  Unit agrees that, during the term of this
               ---------------                                            
     Agreement, it shall not, and shall not authorize or permit any of its
     subsidiaries or any of its or its subsidiaries' directors, officers,
     employees, agents or representatives, directly or indirectly, to solicit,
     initiate, encourage or facilitate, or furnish or disclose nonpublic
     information in furtherance of, any inquiries or the making of any proposal
     with respect to any recapitalization, merger, consolidation or other
     business combination involving Unit, or acquisition of any capital stock
     from Unit (other than upon exercise of Unit Options which are outstanding
     as of the date hereof) or acquisition of any material assets of Unit and
     its subsidiaries, taken as a whole, in a single transaction or a series of
     related transactions, or any acquisition by Unit of any material assets or
     capital stock of any other person, or any combination of the foregoing (a
     "Competing Transaction"), or negotiate, explore or otherwise engage in
     discussions with any person (other than Parent, Subcorp or their respective
     directors, officers, employees, agents and representatives) with respect to
     any Competing Transaction or enter into any agreement, arrangement or
     understanding requiring it to abandon, terminate or fail to consummate the
     Merger or any other transactions contemplated by this Agreement; provided
     that, at any time prior to the approval of the Merger by the Unit

                                       28
<PAGE>
 
     Shareholders, Unit may furnish information to, and negotiate or otherwise
     engage in discussions with, any party who delivers a proposal for a
     Competing Transaction if and so long as the Board of Directors of Unit
     determines in good faith by a majority vote (after consultation with and
     receipt of advice from outside legal counsel leading the Board of Directors
     to conclude) that failing to take such action would constitute a breach of
     the fiduciary duties of the Board of Directors of Unit under Applicable
     Law.  Unit shall immediately cease all existing activities, discussions and
     negotiations with any parties conducted heretofore with respect to any
     proposal for a Competing Transaction.  Notwithstanding any other provision
     of this Section 5.3(d), in the event that prior to the approval of the
     Merger by the Unit Shareholders the Board of Directors of Unit determines
     in good faith by a majority vote (after consultation with and receipt of
     advice from outside legal counsel leading the Board of Directors to
     conclude) that failure to do so would constitute a breach of the fiduciary
     duties of the Unit Board of Directors under Applicable Law, the Board of
     Directors of Unit may withdraw, modify or change the Unit Board
     Recommendation and, to the extent applicable, comply with Rule 14e-2
     promulgated under the Exchange Act with respect to a Competing Transaction
     by disclosing such withdrawn, modified or changed Unit Board Recommendation
     in connection with a tender or exchange offer for Unit securities.  Unit
     shall immediately advise Parent, in writing, of any inquiry, offer or
     proposal regarding a Competing Transaction or any determination of the Unit
     Board of Directors with respect thereto or with respect to the Unit Board
     Recommendation, and shall keep Parent informed at all times of the status
     thereof.

          (e) Termination Right.  If prior to the approval of the Merger by the
              -----------------                                                
     Unit Shareholders the Board of Directors of Unit shall determine in good
     faith, after consultation with its financial and legal advisors, with
     respect to any written proposal from a third party for a Competing
     Transaction received after the date hereof that to continue to recommend
     the Merger notwithstanding the receipt of the offer pertaining to such
     Competing Transaction would constitute a breach of the fiduciary duties of
     the Board of Directors of Unit under Applicable Law and that such Competing
     Transaction is more favorable to the Unit Shareholders than the
     transactions contemplated by this Agreement (including any adjustment to
     the terms and conditions of such transaction proposed in writing by Parent
     in response to such Competing Transaction), Unit may terminate this
     Agreement and enter into an acquisition agreement or other similar
     definitive agreement (each, an "Acquisition Agreement") with respect to
     such Competing Transaction.  Prior to terminating this Agreement pursuant
     to this Section 5.3(e), Unit shall endeavor to provide Parent with a
     reasonable opportunity of not less than 48 hours to respond to any
     Competing Transaction which Unit may wish to accept, including in any case
     advising Parent of the material terms of any Competing Transaction.  In the
     event Unit terminates that Agreement pursuant to this Section 5.3(e), Unit
     shall promptly pay the Termination Fee as provided in Section 7.2.

          (f) Affiliates of Unit.  Unit shall use all reasonable efforts to
              ------------------                                           
     cause such officers and directors of Unit as may be requested by Parent
     and, in any event, each

                                       29
<PAGE>
 
     person who may be at the Effective Time or was on the date hereof an
     "affiliate" of Unit for purposes of Rule 145 under the Securities Act or
     applicable accounting releases of the Commission with respect to pooling-
     of-interests accounting treatment, to execute and deliver to Parent no less
     than 30 days prior to the date of the Unit Shareholders Meeting, the
     written undertakings in the form attached hereto as Exhibit A (the "Unit
     Affiliate Letter").  No later than 45 days prior to the date of the Unit
     Shareholders Meeting, Unit, after consultation with its outside counsel,
     shall provide Parent with a letter (reasonably satisfactory to outside
     counsel to Parent) specifying all of the persons or entities who, in Unit's
     opinion, may be deemed to be "affiliates" of Unit under the preceding
     sentence.

          (g) Access.  Unit shall, and Unit shall cause each of its subsidiaries
              ------                                                            
     to, afford to Parent, and to the officers, employees, accountants, counsel,
     financial advisors and other representatives of Parent, access during
     normal business hours during the period prior to the Effective Time to all
     of Unit's and each of its subsidiaries' respective properties, books,
     contracts, commitments, personnel and records and, during such period, Unit
     shall, and Unit shall cause each of its respective subsidiaries to, furnish
     promptly to Parent, (a) a copy of each report, schedule, registration
     statement and other document filed by it during such period pursuant to the
     requirements of federal or state securities laws and (b) all other
     information concerning its business, properties and personnel as Parent or
     its representatives may request.  Except to the extent otherwise required
     by law, Parent will hold any confidential information obtained pursuant to
     this Section 5.3(g) in accordance with the Confidentiality Agreement dated
     August 20, 1997, between Parent and Unit (the "Confidentiality Agreement").

          (h) Notification of Certain Matters.  Unit shall give prompt notice to
              -------------------------------                                   
     Parent of (i) the occurrence or non-occurrence of any event the occurrence
     or non-occurrence of which would cause any Unit representation or warranty
     contained in this Agreement to be untrue or inaccurate at or prior to the
     Effective Time and (ii) any failure of Unit to comply with or satisfy any
     covenant, condition or agreement to be complied with or satisfied by it
     hereunder; provided, however, that the delivery of any notice pursuant to
     this Section 5.3(h) shall not limit or otherwise affect the remedies
     available hereunder to Parent.

                                   ARTICLE VI
                                   CONDITIONS

     6.1  Conditions to the Obligations of Each Party.  The obligations of Unit,
          -------------------------------------------                           
Parent and Subcorp to consummate the Merger shall be subject to the satisfaction
of the following conditions:

          (a) (i)  This Agreement and the Merger shall have been approved and
     adopted by the Unit Shareholders in the manner required by any Applicable
     Law, and (ii) the issuance of the Shares of Parent Common Stock to be
     issued in the Merger shall have

                                       30
<PAGE>
 
     been approved by the Parent's stockholders if required by any Applicable
     Law and the applicable rules of the NYSE.

          (b) Any applicable waiting periods under the HSR Act relating to the
     Merger and the transactions contemplated by this Agreement shall have
     expired or been terminated, and any requirements of foreign jurisdictions
     applicable to the consummation of the Merger shall have been satisfied
     unless the failure of such requirements of foreign jurisdictions to be
     satisfied does not constitute a Material Adverse Effect in respect of
     either Unit or Parent.

          (c) No judgment, injunction, order or decree shall prohibit or enjoin
     the consummation of the Merger.

          (d) There shall not be pending any Action by any federal Governmental
     Authority challenging or seeking to restrain or prohibit the consummation
     of the Merger.

          (e) The Commission shall have declared the Registration Statement
     effective under the Securities Act, and no stop order or similar
     restraining order suspending the effectiveness of the Registration
     Statement shall be in effect and no proceedings for such purpose shall be
     pending before or threatened by the Commission.

          (f) The Shares of Parent Common Stock to be issued in the Merger shall
     have been approved for listing on the NYSE, subject to official notice of
     issuance.

     6.2  Conditions to Obligations of Unit.  The obligations of Unit to
          ---------------------------------                             
consummate the Merger and the transactions contemplated hereby shall be subject
to the fulfillment of the following conditions unless waived by Unit:

          (a) The representations and warranties of Parent and Subcorp set forth
     in Article III shall be true and correct in all material respects on the
     date hereof and on and as of the Closing Date as though made on and as of
     the Closing Date (except for such representations and warranties made as of
     a specified date, the accuracy of which will be determined as of the
     specified date).

          (b) Each of Parent and Subcorp shall have performed in all material
     respects each obligation and agreement and shall have complied in all
     material respects with each covenant to be performed and complied with by
     it hereunder at or prior to the Effective Time.

          (c) Each of Parent and Subcorp shall have furnished Unit with a
     certificate dated the Closing Date signed on behalf of it by the Chairman,
     President or any Vice President to the effect that the conditions set forth
     in Sections 6.2(a) and (b) have been satisfied.

                                       31
<PAGE>
 
          (d) Unit shall have received the opinion of Stradling, Yocca dated on
     or prior to the effective date of the Registration Statement, to the effect
     that (i) the Merger will constitute a reorganization under Section 368(a)
     of the Code, (ii) Unit, Parent and Subcorp will each be a party to that
     reorganization, and (iii) no gain or loss will be recognized by the
     shareholders of Unit upon the receipt of Shares of Parent Common Stock in
     exchange for shares of Unit Common Stock pursuant to the Merger, except
     with respect to cash received in lieu of fractional share interests in
     Shares of Parent Common Stock.

     6.3  Conditions to Obligations of Parent and Subcorp.  The obligations of
          -----------------------------------------------                     
Parent and Subcorp to consummate the Merger and the other transactions
contemplated hereby shall be subject to the fulfillment of the following
conditions unless waived by Parent:

          (a) The representations and warranties of Unit set forth in Article IV
     shall be true and correct in all material respects on the date hereof and
     on and as of the Closing Date as though made on and as of the Closing Date
     (except for such representations and warranties made as of a specified
     date, the accuracy of which will be determined as of the specified date).

          (b) Unit shall have performed in all material respects each obligation
     and agreement and shall have complied in all material respects with each
     covenant to be performed and complied with by it hereunder at or prior to
     the Effective Time.

          (c) Unit shall have obtained the consent and approval of each person
     whose consent is required in connection with the Merger under all
     agreements to which Unit or any of its subsidiaries is a party.

          (d) From and including the date hereof, there shall not have occurred
     any Material Adverse Change with respect to Unit (other than as may be
     disclosed in writing by Unit to Parent not less than five (5) business days
     prior to the Investigation Date).

          (e) Unit shall have furnished Parent and Subcorp with a certificate
     dated the Closing Date signed on its behalf by its Chairman, President or
     any Vice President to the effect that the conditions set forth in Sections
     6.3(a), (b), (c) and (d) have been satisfied.

          (f) Parent shall have concluded an investigation of the business,
     condition (financial and other), properties, assets, liabilities,
     prospects, operations and affairs of Unit, and Parent shall be satisfied,
     in its reasonable discretion, with the results of such investigation;
     provided, however, that this condition shall be deemed satisfied unless
     Parent delivers written notice (an "Investigation Notice") to Unit by 5:00
     p.m. PDT on July 31, 1998 (the "Investigation Date"), which Notice shall
     state in reasonable detail the basis for Parent's dissatisfaction and, if
     applicable, Parent's intention to terminate this Agreement pursuant to
     Section 7.1(h).  Unit's

                                       32
<PAGE>
 
     representations and warranties set forth in this Agreement shall remain in
     full force and effect notwithstanding any investigation conducted by Parent
     under this Section 6.3(g), and Parent's failure to give notice under this
     Section 6.3(g) shall not be deemed to constitute a waiver by Parent of any
     of Parent's rights or remedies in the event of a breach by Unit of any of
     such representations or warranties.  Notwithstanding the foregoing, this
     condition shall not apply to any matter which is expressly disclosed in the
     Unit Disclosure Schedules or in the Unit SEC Documents filed with the
     Commission prior to the date of this Agreement, except to the extent that
     the disclosure contained therein (a) does not disclose with reasonable
     accuracy the nature or magnitude of the impact on Unit's business, assets,
     condition (financial or other), results of operations or prospects or
     Unit's exposure with respect to any actual or potential liability, or (b)
     references documents which have not yet been provided to Parent, or (c)
     otherwise does not contain detail reasonably sufficient for Parent to
     evaluate the matters disclosed.

                                  ARTICLE VII
                           TERMINATION AND AMENDMENT

     7.1  Termination.  This Agreement may be terminated and the Merger may be
          -----------                                                         
abandoned at any time prior to the Effective Time (notwithstanding any approval
of this Agreement by Unit Shareholders):

          (a) by mutual written consent of Parent and Unit;

          (b) by either Parent or Unit if any judgment, injunction, order or
     decree of a court or other Governmental Authority of competent jurisdiction
     enjoining Parent or Unit from consummating the Merger shall have been
     entered and such judgment, injunction, order or decree shall have become
     final and nonappealable;

          (c) by either Parent or Unit if the Merger shall not have been
     consummated before December 31, 1998, provided, however, that the right to
     terminate this Agreement under this Section 7.1(c) shall not be available
     to any party whose failure or whose affiliate's failure to perform any
     material covenant or obligation under this Agreement has been the cause of
     or resulted in the failure of the Merger to occur on or before such date;

          (d) by Parent if the Board of Directors of Unit shall withdraw, or
     shall modify or change the Unit Board Recommendation in a manner adverse to
     Parent;

          (e) by Parent or Unit if at the Unit Shareholders Meeting (including
     any adjournment or postponement thereof) the requisite vote of the Unit
     Shareholders to approve the Merger and the transactions contemplated hereby
     shall not have been obtained;

          (f) by Unit, pursuant to Section 5.3(e);

                                       33
<PAGE>
 
          (g) by Parent or Unit if there shall have been a material breach by
     the other of any of its representations, warranties, covenants or
     agreements contained in this Agreement, which breach would result in the
     failure to satisfy one or more of the conditions set forth in Section
     6.2(a) or 6.2(b) (in the case of a breach by Parent) or Section 6.3(a),
     6.3(b), 6.3(c) or 6.3(d) (in the case of a breach by Unit) or would result
     in a material adverse effect on the ability of Parent and/or Unit to
     consummate the Merger, and such breach shall not have been cured within 30
     days after notice thereof shall have been received by the party alleged to
     be in breach;

          (h) by Parent, upon failure of the condition set forth in Section
     6.3(g), unless Unit cures all conditions referenced in the Investigation
     Notice (if susceptible to cure) within 30 days after the receipt of such
     Investigation Notice; or

          (i) by Unit, if the Average Share Price is less than $24.00.

     7.2  Effect of Termination.
          --------------------- 

          (a) In the event of the termination of this Agreement pursuant to
     Section 7.1, this Agreement, except for the provisions of the second
     sentence of Section 5.3(g) and the provisions of Sections 7.2 and 8.11,
     shall become void and have no effect, without any liability on the part of
     any party or its directors, officers or stockholders.  No termination of
     this Agreement shall affect the obligations contained in the
     Confidentiality Agreement, which will survive in accordance with its terms.
     Notwithstanding the foregoing, nothing in this Section 7.2 shall relieve
     any party to this Agreement of liability for a material breach of any
     provision of this Agreement and provided, further, however, that if it
     shall be judicially determined that termination of this Agreement was
     caused by an intentional breach of this Agreement by either party, then, in
     addition to other remedies at law or equity for breach of this Agreement,
     the breaching party shall indemnify and hold harmless the non-breaching
     parties for their respective out-of-pocket costs, fees and expenses of
     their counsel, accountants, financial advisors and other experts and
     advisors as well as fees and expenses incident to negotiation, preparation
     and execution of this Agreement and related documentation, preparation of
     filings, and shareholders' meetings and consents, and any litigation by
     third parties resulting from the execution of this Agreement ("Costs").

          (b)  Unit agrees that, if:

               (i) Unit terminates this Agreement pursuant to Section 7.1(f); or

               (ii) (A) Unit terminates this Agreement pursuant to Section
          7.1(e) or Parent terminates this Agreement pursuant to Section 7.1(d),
          (B) at the time of such termination there is a publicly announced or
          disclosed Competing Transaction with respect to Unit involving a third
          party or, in the case of a termination pursuant to Section 7.1(d), at
          the time of such termination there is

                                       34
<PAGE>
 
          a Competing Transaction with respect to Unit involving a third party
          of which Unit is aware, and (C) within nine months after such
          termination, Unit shall enter into an Acquisition Agreement for a
          Business Combination (as defined below) or consummates a Business
          Combination;

     then, (X) in the case of a termination by Unit as described in clause (i)
     above, concurrently with such termination, or (Y) in the case of a
     termination by Unit or Parent as described in clause (ii) above upon the
     earlier of the consummation of a Business Combination or execution of a
     definitive agreement with respect thereto, Unit will pay to Parent in cash
     by wire transfer in immediately available funds to an account designated by
     Parent (i) in reimbursement for Parent's expenses an amount in cash equal
     to the aggregate amount of Parent's costs incurred in connection with
     pursuing the transactions contemplated by this Agreement, including,
     without limitation, legal, accounting and investment banking fees and (ii)
     a termination fee in an amount equal to $1.5 million (such amounts
     collectively, the "Termination Fee").  For the purposes of this Section
     7.2, "Business Combination" means (i) a merger, consolidation, share
     exchange, business combination or similar transaction involving Unit as a
     result of which the Unit Shareholders prior to such transaction in the
     aggregate cease to own at least 50% of the voting securities of the entity
     surviving or resulting from such transaction (or the ultimate parent entity
     thereof), (ii) a sale, lease, exchange, transfer or other disposition of
     any material assets of Unit or its subsidiaries, or (iii) the acquisition,
     by a person (other than Parent or any affiliate thereof) or group (as such
     term is defined under Section 13(d) of the Exchange Act and the rules and
     regulations thereunder) of beneficial ownership (as defined in Rule 13d-3
     under the Exchange Act) of more than 20% of the Unit Common Stock whether
     by tender or exchange offer or otherwise.

     (c) In the event that Unit shall fail to pay the Termination Fee or any
other amount payable under Section 7.2(b) when due, such amount shall be
increased to include the costs and expenses actually incurred or accrued by
Parent (including, without limitation, fees and expenses of counsel) in
connection with the collection under and enforcement of this Section 7.2,
together with interest on such unpaid Termination Fee or expenses, commencing on
the date that such Termination Fee or expenses became due, at a rate equal to
the rate of interest publicly announced by Bank of America, from time to time,
in the City of Los Angeles as such bank's base rate plus 3.00%; provided,
however, that such interest shall not exceed the maximum permitted under any
applicable usury or similar law or regulation.

     7.3  Amendment.  This Agreement may be amended by the parties hereto, by
          ---------                                                          
action taken or authorized by their respective Boards of Directors, at any time
before or after adoption of this Agreement by Unit Shareholders, but after any
such approval, no amendment shall be made which by law requires further approval
or authorization by the Unit Shareholders without such further approval or
authorization.  Notwithstanding the foregoing, this Agreement may not be amended
except by an instrument in writing signed on behalf of each of the parties
hereto.

                                       35
<PAGE>
 
     7.4  Extension; Waiver.  At any time prior to the Effective Time, Parent
          -----------------                                                  
(with respect to Unit) and Unit (with respect to Parent and Subcorp) by action
taken or authorized by their respective Boards of Directors, may, to the extent
legally allowed, (a) extend the time for the performance of any of the
obligations or other acts of such party, (b) waive any inaccuracies in the
representations and warranties contained herein or in any document delivered
pursuant hereto and (c) waive compliance with any of the agreements or
conditions contained herein.  Any agreement on the part of a party hereto to any
such extension or waiver shall be valid only if set forth in a written
instrument signed on behalf of such party.

     7.5  Exclusive Remedy.  In the event that any Termination Fee is paid
          ----------------                                                
pursuant to Section 7.2, notwithstanding any other provision of this Agreement,
it is understood and agreed that such Termination Fee shall be the exclusive
remedy for any act or omission resulting in the termination of this Agreement or
other claim arising out of this Agreement or the transactions contemplated
hereby.

                                  ARTICLE VIII
                                 MISCELLANEOUS

     8.1  Survival of Representations and Warranties.  The representations and
          ------------------------------------------                          
warranties made herein by the parties hereto shall not survive the Effective
Time.  This Section 8.1 shall not limit any covenant or agreement of the parties
hereto, which by its terms contemplates performance after the Effective Time or
after the termination of this Agreement.

     8.2  Notices.  All notices and other communications hereunder shall be in
          -------                                                             
writing and shall be deemed given if delivered personally, telecopied (which is
confirmed) or dispatched by a nationally recognized overnight courier service to
the parties at the following addresses (or at such other address for a party as
shall be specified by like notice):

          (a)  if to Parent or Subcorp:

               United States Filter Corporation
               40-004 Cook Street
               Palm Desert, California  92211
               Attention: Damian C. Georgino
               Telecopy No.: (760) 346-4024

               with a copy to

               Gary J. Singer, Esq.
               O'Melveny & Myers LLP
               610 Newport Center Drive, Suite 1700
               Newport Beach, California 92660
               Telecopy No.: (949) 823-6994

                                       36
<PAGE>
 
          (b)  if to Unit:

               Unit Instruments, Inc.
               22600 Savi Ranch Parkway
               Yorba Linda, California  92687
               Attention: Mr. Gary Patten
               Telecopy No.: (714) 921-0636

               with a copy to

               Nick E. Yocca, Esq.
               Stradling Yocca Carlson & Rauth
               660 Newport Center Drive, Suite 1600
               Newport Beach, California 92660
               Telecopy No.: (949) 725-4100
 
     8.3  Interpretation.
          -------------- 

          (a) When a reference is made in this Agreement to an Article or
     Section, such reference shall be to an Article or Section of this Agreement
     unless otherwise indicated.  The headings and the table of contents
     contained in this Agreement are for reference purposes only and shall not
     affect in any way the meaning or interpretation of this Agreement.  When a
     reference is made in this Agreement to Unit, such reference shall be deemed
     to include any and all subsidiaries of Unit, individually and in the
     aggregate, except for Sections 4.1, 4.2, 4.3, 4.4, 4.5, 4.7, 4.8, 4.12,
     4.16, 4.17, 4.19, 4.20, 4.21 and 8.3.

          (b) For the purposes of any provision of this Agreement, a "Material
     Adverse Effect" or a "Material Adverse Change" with respect to any party
     shall be deemed to occur if any event, change or effect, individually or in
     the aggregate with such other events, changes or effects, has occurred
     which has a material adverse effect on the business, financial condition,
     results of operations or prospects of such party and its subsidiaries taken
     as a whole; provided, however, that a Material Adverse Effect with respect
     to any party shall not include any change in or effect upon the business,
     financial condition, results of operations or prospects of such party or
     any of its subsidiaries directly or indirectly arising out of or
     attributable to or a consequence of (i) conditions, events, or
     circumstances generally affecting the industries in which Parent (and its
     subsidiaries) and Unit (and its subsidiaries) operate or the economy in
     general, (ii) the loss by such party (and its subsidiaries) of any of its
     customers, suppliers or employees as a result of the transactions
     contemplated hereby or the public announcement of this Agreement, or (iii)
     any action or change specifically contemplated by the provisions of this
     Agreement or specifically disclosed in the Unit Disclosure Schedule or the
     Parent Disclosure Schedule.

                                       37
<PAGE>
 
          (c) For purposes of this Agreement, a "subsidiary" of any person means
     another person, an amount of the voting securities or other voting
     ownership or voting partnership interests of which is sufficient to elect
     at least a majority of its Board of Directors or other governing body (or,
     if there are no such voting securities or interests, 50% or more of the
     equity interests of which) is owned directly or indirectly by such first
     person.

          (d) For purposes of this Agreement, "knowledge" of a party shall mean
     the actual knowledge of all officers of such party with a title of vice
     president or higher.

     8.4  Counterparts.  This Agreement may be executed in counterparts, which
          ------------                                                        
together shall constitute one and the same Agreement.  The parties may execute
more than one copy of this Agreement, each of which shall constitute an
original.

     8.5  Entire Agreement.  This Agreement (including the documents and the
          ----------------                                                  
instruments referred to herein) and the Confidentiality Agreement constitute the
entire agreement among the parties and supersede all prior agreements and
understandings, agreements or representations by or among the parties, written
and oral, with respect to the subject matter hereof and thereof.

     8.6  Third Party Beneficiaries.  Except as expressly set forth in Section
          -------------------------                                           
5.2(e) hereof, nothing in this Agreement, express or implied, is intended or
shall be construed to create any third party beneficiaries.

     8.7  Governing Law.  Except to the extent that the laws of the jurisdiction
          -------------                                                         
of organization of any party hereto, or any other jurisdiction, are mandatorily
applicable to the Merger or to matters arising under or in connection with this
Agreement, this Agreement shall be governed by the laws of the State of
California.  All actions and proceedings arising out of or relating to this
Agreement shall be heard and determined in any state or federal court sitting in
California.

     8.8  Consent to Jurisdiction; Venue.
          ------------------------------ 

          (a) Each of the parties hereto irrevocably submits to the exclusive
     jurisdiction of the state courts of California and to the jurisdiction of
     any United States District Court located in California, for the purpose of
     any action or proceeding arising out of or relating to this Agreement, and
     each of the parties hereto irrevocably agrees that all claims in respect to
     such action or proceeding may be heard and determined exclusively in any
     California state or federal court sitting in California.  Each of the
     parties hereto agrees that a final judgment in any action or proceeding
     shall be conclusive and may be enforced in other jurisdictions by suit on
     the judgment or in any other manner provided by law.

          (b) Each of the parties hereto irrevocably consents to the service of
     any summons and complaint and any other process in any other action or
     proceeding

                                       38
<PAGE>
 
     relating to the Merger, on behalf of itself or its property, by the
     personal delivery of copies of such process to such party.  Nothing in this
     Section 8.8 shall affect the right of any party hereto to serve legal
     process in any other manner permitted by law.

     8.9  Specific Performance.  The transactions contemplated by this Agreement
          --------------------                                                  
are unique.  Accordingly, each of the parties acknowledges and agrees that, in
addition to all other remedies to which it may be entitled, each of the parties
hereto is entitled to a decree of specific performance, provided such party is
not in material default hereunder.

     8.10 Assignment.  Neither this Agreement nor any of the rights, interests
          ----------                                                          
or obligations hereunder shall be assigned by any of the parties hereto (whether
by operation of law or otherwise) without the prior written consent of the other
parties.  Subject to the preceding sentence, this Agreement shall be binding
upon, inure to the benefit of and be enforceable by the parties and their
respective successors and assigns.

     8.11 Expenses.  Subject to the provisions of Section 7.2, all costs and
          --------                                                          
expenses incurred in connection with this Agreement and the transactions
contemplated hereby and thereby shall be paid by the party incurring such
expenses.

                                       39
<PAGE>
 
     IN WITNESS WHEREOF, Parent, Subcorp and Unit have signed this Agreement as
of the date first written above.

                         "PARENT"

                         UNITED STATES FILTER CORPORATION, a Delaware
                         corporation


                         By:  _________________________________________________
                              Name: Damian C. Georgino
                              Title: Executive Vice President

                         "SUBCORP"

                         KINETICS ACQUISITION CORP.,
                         a California corporation


                         By:  _________________________________________________
                              Name: Damian C. Georgino
                              Title: Vice President

                         "UNIT"

                         UNIT INSTRUMENTS, INC., a California corporation


                         By:  _________________________________________________
                              Name: Gary N. Patten
                              Title: Vice President and Chief Financial Officer

                                      S-1

<PAGE>
 
                                                                    EXHIBIT 99.1
                                                                                



Contact:  Gary N. Patten
          Chief Financial Officer
          714/921-2640

          Roger S. Pondel
          Pondel Parsons & Wilkinson
          310/207-9300

                                        



                       Unit Announces Merger Discussions


YORBA LINDA, CA - June 29, 1998 -- Unit Instruments, Inc. (Nasdaq: UNII)
announced today that it is in merger discussions for the acquisition of the
company by a third party.  There can be no assurances that the parties will
reach a mutually acceptable agreement and any such agreement for the acquisition
of Unit would require the approval of both companies' Board of Directors and the
approval of Unit's shareholders at a special Shareholders' meeting.

     Unit Instruments, Inc. is a leading manufacturer of mass flow controllers
and gas delivery systems for the semiconductor and industrial markets.  The
company maintains support and service centers throughout North America, Europe
and the Pacific Rim.  Unit Instruments is traded on the Nasdaq National Market
under the symbol UNII.  Unit's web site is located at http://www.unit.com.

                                     # # #

<PAGE>
 
                                                                    EXHIBIT 99.2
                                                                                



Contact:  Gary N. Patten
          Chief Financial Officer
          714/921-2640

          Roger S. Pondel
          Pondel Parsons & Wilkinson
          310/207-9300

                                        

                  Unit Instruments Announces Merger Agreement


YORBA LINDA, CA - July 2, 1998  -- Unit Instruments, Inc. (Nasdaq: UNII)
announced today that it has signed a definitive agreement under which it will
merge with a wholly-owned subsidiary of United States Filter Corporation (NYSE:
USF).

     Under the agreement, shareholders of Unit Instruments will receive $12.62
in U.S. Filter common stock for each share of Unit common stock.  The exchange
ratio is subject to adjustment.  The number of shares of U.S. Filter stock to be
issued in the merger will be based on the average closing price of U.S. Filter
stock over a 20-day period ending five days prior to the closing date.  If the
average stock price is above $27.00, the average price will be used as the U.S.
Filter stock valuation.  If the average price falls below $27.00, U.S. Filter
stock will be valued at $27.00.  Unit may elect to terminate the merger
agreement if U.S. Filter's stock price averages below $24.00 per share.  The
transaction is expected to be accounted for as a tax-free reorganization.

     The closing of the merger is subject to certain conditions, including
(among others) satisfactory completion by U.S. Filter of the due diligence
during the 30-day period following the date of the agreement, expiration of the
Hart-Scott-Rodino waiting period, and approval by Unit shareholders.  The
transaction is expected to close in September, 1998.  Following the 
<PAGE>
 
merger, Unit will become a wholly-owned subsidiary within U.S. Filter's Kinetics
Group ("USF Kinetics").

     Unit Instruments is a leading manufacturer of mass flow controllers and
high-purity integrated gas panels, devices used to precisely measure and deliver
critical gas flow in semiconductor manufacturing processes.  The company's
products sell worldwide, both to original equipment manufacturers and
semiconductor end users.  Applied Materials and Lam Research accounted for
approximately 22% and 7% of sales, respectively, during fiscal 1998. The company
maintains support and service centers throughout North America, Europe, and the
Pacific Rim.  USF Kinetics, acquired earlier this year by U.S. Filter, is a
leading designer, manufacturer, and installer of critical high-purity process
systems used in semiconductor, biotech, and pharmaceutical manufacturing.

     "The combination of Unit and USF Kinetics creates the opportunity to offer
the semiconductor industry an integrated gas delivery solution that meets next-
generation manufacturing requirements, while reducing the overall cost of owning
a semiconductor fabrication facility," said Michael J. Doyle, president and
chief executive officer of Unit Instruments.  "By uniting these companies, we
expect to have the resources and technology to bring new solutions to both the
semiconductor equipment market and the manufacturers of integrated circuits.  In
addition, USF Kinetics' and Unit's combined network of facilities enables the
combined company to offer enhanced service capability worldwide," concluded
Doyle.

     "We are absolutely delighted to announce this merger," said David Shimmon,
president and chief operating officer of USF Kinetics.  "The addition of Unit
Instruments complements our strategy of developing integrated products for the
high-purity gas delivery market, and will allow us to provide more complete
turnkey gas delivery solutions to our customers.  Unit represents a significant
step toward USF Kinetics' goal of becoming the world's leading provider of high-
purity gas delivery systems to the semiconductor wafer fabrication equipment
market."

     This news release contains forward-looking statements that involve risks
and uncertainties that could cause actual results to differ materially from
those projected.  Such risks and uncertainties include, but are not limited to,
the failure of one or more of the
<PAGE>
 
conditions of the transaction, the price of U.S. Filter stock during the 20-day
average pricing period, business activity levels in both the U.S. and
international semiconductor equipment markets, the magnitude and duration of the
current industry downturn, the company's dependence on a few large customers,
new technology developments and competitive conditions within the company's
markets, performance and industry acceptance of the company's products,
specifically digital and Safe Delivery Source (SDS(TM)) MFCs, product pricing
pressures, performance and profitability under fixed price contracts, expenses
for extended product warranty, adequacy of cost reduction programs, the
successful commercialization of the Z-Bloc(TM) Modular Gas System, development
of a viable industrial sales base, and other challenges from the company's
competition.  Certain of these and other risks are detailed from time to time in
Unit Instruments' filings with the U.S. Securities and Exchange Commission,
including the Annual Report on Form 10-K for the fiscal year ended May 31, 1997
and its most recent Quarterly Report on Form 10-Q for the quarter ended February
28, 1998.  In light of the significant risks and uncertainties inherent in the
forward-looking information included herein, there can be no assurance that the
results contemplated by such statements will be achieved.  The company assumes
no obligation to update the information in this release.

     Additional information on Unit Instruments, Inc. is available at
http://www.unit.com.  The USF Kinetics' web site can be found at
http://www.kineticsgroup.com.

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