INTERNATIONAL REMOTE IMAGING SYSTEMS INC /DE/
SC 13D, 1996-08-08
LABORATORY ANALYTICAL INSTRUMENTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934


                   INTERNATIONAL REMOTE IMAGING SYSTEMS, INC.

                                (Name of Issuer)


                     Common Stock, par value $0.01 per share

                         (Title of Class of Securities)


                                   460259 500

                                 (CUSIP Number)

                                  James L. Hurn
                       Digital Imaging Technologies, Inc.
                        2950 North West Loop, Suite #1050
                              Houston, Texas 77092
                                 (713) 956-2165

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                  July 31, 1996

             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13G, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box: / /


Check the following box if a fee is being paid with the statement:   /X/



<PAGE>
                                                           Page 2 of 12 Pages


                                  SCHEDULE 13D

CUSIP No. 460259 500

- --------------------------------------------------------------------------------
1.       Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

         Digital Imaging Technologies, Inc.
         76-0464035
- --------------------------------------------------------------------------------
2.       Check the Appropriate Box if a Member of a Group

         (a)  /x/
         (b)  / /
- --------------------------------------------------------------------------------
3.       SEC Use Only

- --------------------------------------------------------------------------------
4.       Source of Funds

         OO
- --------------------------------------------------------------------------------
5.       Check Box if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e):               / /

- --------------------------------------------------------------------------------
6.       Citizenship or Place of Organization

         Delaware
- --------------------------------------------------------------------------------
                           7.       Sole Voting Power
Number of Shares           
Beneficially                        853,040 shares of Common Stock
Owned by                   -----------------------------------------------------
Each                       8.       Shared Voting Power
Person
With                                0
                           -----------------------------------------------------
                           9.       Sole Dispositive Power

                                    853,040 shares of Common Stock
- --------------------------------------------------------------------------------
<PAGE>
                                                            Page 3 of 12 Pages

                         
                           10.      Shared Dispositive Power

                                    -0-
- --------------------------------------------------------------------------------
11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         853,040 shares of Common  Stock  issuable  within  sixty days upon the
         exercise  of  a  warrant   held   directly  by  Digital   Imaging
         Technologies, Inc. ("DITI")
- --------------------------------------------------------------------------------
12.      Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares

           / / 
- --------------------------------------------------------------------------------
13.      Percent of Class Represented by Amount in Row (11)

         11.8%*
- --------------------------------------------------------------------------------
14.      Type of Reporting Person

         CO
- --------------------------------------------------------------------------------

- ---------- 
          *Assumes  6,374,970  shares of  International  Remote Imaging Systems,
Inc.  ("IRIS") Common Stock  outstanding as of March 31, 1996, as represented by
IRIS in its quarterly report on Form 10-Q.

<PAGE>
                                                            Page 4 of 12 Pages


                                  SCHEDULE 13D

CUSIP No. 460259 500

- --------------------------------------------------------------------------------
1.       Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

         Edward Randall, III
         ###-##-####
- --------------------------------------------------------------------------------
2.       Check the Appropriate Box if a Member of a Group

         (a) /x/
         (b) / /
- --------------------------------------------------------------------------------
3.       SEC Use Only

- --------------------------------------------------------------------------------
4.       Source of Funds

         Not applicable
- --------------------------------------------------------------------------------
5.       Check Box if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e):   / /
- --------------------------------------------------------------------------------
6.       Citizenship or Place of Organization

         United States of America
- --------------------------------------------------------------------------------
                           7.       Sole Voting Power
Number of Shares
Beneficially                         853,040 shares of Common Stock
Owned by                   -----------------------------------------------------
Each                       8.       Shared Voting Power
Person
With                                -0-
                           -----------------------------------------------------
                           9.       Sole Dispositive Power

                                    853,040 shares of Common Stock
                          
                           
- --------------------------------------------------------------------------------
<PAGE>


                                                          Page 5 of 12 Pages

                         

                           10.      Shared Dispositive Power

                                    -0-
- --------------------------------------------------------------------------------
11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         853,040 shares of Common Stock issuable within sixty days upon the
         exercise of a warrant held directly by DITI.  Mr. Randall currently 
         owns all of the outstanding shares of capital stock of DITI.       
- --------------------------------------------------------------------------------
12.      Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares

         / /
- --------------------------------------------------------------------------------
13.      Percent of Class Represented by Amount in Row (11)

         11.8%**
- --------------------------------------------------------------------------------
14.      Type of Reporting Person

         IN
- --------
         ** Assumes  6,374,970  shares of IRIS Common  Stock  outstanding  as of
March 31, 1996, as represented by IRIS in its quarterly report on Form 10-Q.



<PAGE>


                                                           Page 6 of 12 Pages

Item 1.           Security and Issuer

                  This  Statement  on  Schedule  13D  relates to the  beneficial
ownership of shares of common stock, par value $0.01 per share ("Common Stock"),
of  International  Remote Imaging  Systems,  Inc., a Delaware  corporation  (the
"Company").  The address of the Company's  principal  executive  offices is 9162
Eton Avenue, Chatsworth, California 91311.

Item 2.           Identity and Background

                  (a)      This Statement on Schedule 13D is being filed jointly
by Digital Imaging Technologies, Inc., a Delaware corporation ("DITI") and Mr.
Edward Randall, III.

                  (b) Following the sale of certain  assets  described in Item 4
below,  DITI currently owns the stock of several  subsidiaries and is engaged in
the business of developing,  manufacturing,  marketing and selling digital image
processing and analysis  products and services for use solely in the oil and gas
industry. The address of the principal business and the principal office of DITI
is 2950 North West Loop, Suite #1050, Houston, Texas 77092.

                  (c)  Information  concerning  (i) each  executive  officer and
director of DITI and (ii) each controlling  person of DITI, which information is
required to be  disclosed  in response  to Item 2 and General  Instruction  C to
Schedule 13D, is attached as Appendix A. The executive officer and sole director
may be deemed,  but are not  conceded to be,  controlling  persons of DITI.  Mr.
Randall  currently owns all of the outstanding  shares of capital stock of DITI.
There are no other persons ultimately in control of DITI.

                  (d)  The business  address of Mr. Randall is 5851 San Felipe,
Suite 850, Houston, Texas 77057. Mr. Randall's current principal occupation is a
private investor.

                  (e) During the last five years,  neither DITI nor Mr.  Randall
have been convicted in a criminal  proceeding  (excluding traffic violations and
similar misdemeanors).

                  (f) During the last five years,  neither DITI nor Mr.  Randall
has been a party to a civil proceeding of a judicial or  administrative  body of
competent jurisdiction and as a result of such proceeding is or was subject to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

                  (g)      Mr. Randall is a citizen of the United States.


<PAGE>


                                                            Page 7 of 12 Pages


Item 3.           Source and Amount of Funds or Other Consideration

                  As consideration  for the warrants,  DITI transferred  certain
intellectual  property  and other  assets used in the  business  of  developing,
manufacturing  and marketing  digital image processing and analysis products and
services.  The transactions described in Item 4 below are incorporated herein by
reference.


Item 4.           Purpose of Transactions

                  On July 31, 1996, pursuant to an Asset Purchase Agreement (the
"Purchase  Agreement"),  dated as of July 15, 1995, among the Company, DITI, and
Perceptive  Scientific  Instruments,   Inc.("PSII")  and  Perceptive  Scientific
Technologies,  Inc.  ("PSTI"),  each of which are Delaware  corporations  wholly
owned by DITI, the Company  purchased  certain  intellectual  property and other
assets used in the business of developing,  manufacturing  and marketing digital
image  processing  and  analysis  products  and  services.  The full text of the
Purchase  Agreement  is filed as  Exhibit A hereto  and  incorporated  herein by
reference.  The purchase  price paid by the Company to DITI on July 31, 1996 was
(i)  $9,328,821  in  cash,  subject  to  adjustments,   (ii)  an  8-1/2%  Senior
Subordinated  Note due 2001 in the  principal  amount  of  $7,000,000  and (iii)
warrants to purchase  875,000 shares (the "Original  Warrants") of Common Stock,
at an exercise price of $8.00 per share.

                  On July 31, 1996,  immediately  following  the issuance of the
Original  Warrants,  DITI  transferred,  and the Company  reissued,  warrants to
purchase  21,960  shares of Common  Stock to Anthony G.  Landells  pursuant to a
separate Agreement, dated as of July 2, 1996, the full text of which is filed as
Exhibit B hereto.

                  Following  the  completion  of  the   immediately   successive
transactions  on July 31, 1996 pursuant to the agreements set forth in Exhibit A
and Exhibit B, DITI  beneficially  owned warrants to purchase  853,040 shares of
Common Stock.  DITI is a beneficial  owner of the 853,040 shares of Common Stock
pursuant to Rule 13d-3(a) and  13d-3(d)(1)(i)(A)  under the Securities  Exchange
Act of 1934, as amended (the "Exchange Act").

                    All of the  outstanding  shares of capital stock of DITI are
owned by Mr. Edward  Randall,  III.  Accordingly,  Mr.  Randall is also deemed a
beneficial  owner of the 853,040  shares of Common Stock  beneficially  owned by
DITI pursuant to Rule 13d-3 under the Exchange Act.

                    Pursuant  to Section  10.7 of the  Purchase  Agreement,  Mr.
Randall will be elected as a director to the Board of Directors of the Company.




<PAGE>


                                                             Page 8 of 12 Pages

                  Except as  disclosed  in this Item 4, DITI and Mr.  Randall do
not have any current plans or proposals that relate to or would result in any of
the events  described in Items (a) through (j) of the  instructions to Item 4 of
Schedule 13D. The foregoing response to this Item 4 is qualified in its entirety
by  reference  to the  Purchase  Agreement,  the full  text of which is filed as
Exhibit A hereto and incorporated herein by reference.

Item 5.           Interest in Securities of the Issuer

                  (a) The Company  reported in its quarterly report on Form 10-Q
that it had issued and  outstanding  on March 31, 1996 an aggregate of 6,374,970
shares of Common Stock. The number of shares of Common Stock which are deemed to
be beneficially owned directly by DITI and indirectly by Mr. Randall pursuant to
the warrant held by DITI is 853,040 shares, or approximately  11.8% of the class
of  such  securities.  Beneficial  ownership  of such  shares  was  acquired  as
described in Item 4.

                  (b) The number of shares of Common  Stock as to which there is
sole power to direct the vote,  shared power to vote or to direct the vote, sole
power to dispose or direct the  disposition or shared power to dispose or direct
the disposition for DITI is set forth in the cover pages,  and such  information
is incorporated  herein by reference.  To the knowledge of DITI and Mr. Randall,
the persons listed on Appendix A in response to Item 2, other than Mr.  Randall,
do not beneficially own any shares of Common Stock.

                  (c) There have been no reportable transactions with respect to
the Common Stock within the last 60 days by DITI or Mr.  Randall  except for the
disposition  of  beneficial  ownership  of the  21,960  shares  to Mr.  Landells
described  in Item 4 above  and the  acquisition  by  DITI  and Mr.  Randall  of
beneficial ownership of the shares being reported on this Schedule 13D.

                  (d) To the knowledge of DITI and Mr. Randall,  no other person
is known to have the right to  receive  or the power to direct  the  receipt  of
dividends  from, or the proceeds from the sale of, the shares being  reported on
this Schedule 13D.

                  (e)      Not applicable.

Item   6.           Contracts,   Arrangements,   Understandings   or
                    Relationships With Respect to Securities of the Issuer

                  The  responses  to Item 2, Item 3 and Item 4, and the Purchase
Agreement are incorporated herein by reference.


<PAGE>

                                                            Page 9 of 12 Pages

Item 7.           Material Filed as Exhibits

                  The following are filed  herewith as Exhibits to this Schedule
13D:

                    A. Asset Purchase  Agreement,  dated as of July 15, 1996, by
                    and  among  International  Remote  Imaging  Systems,   Inc.,
                    Digital Imaging  Technologies,  Inc.,  Perceptive Scientific
                    Instruments,  Inc. and Perceptive  Scientific  Technologies,
                    Inc.

                    B. Agreement, dated as of July 2, 1996, by and among Digital
                    Imaging    Technologies,    Inc.,    Perceptive   Scientific
                    Instruments,   Inc.,  Perceptive  Scientific   International
                    Limited,   Edward  Randall  III,  Anthony  G.  Landells  and
                    Marjorie Landells.

                    C.  Agreement  for Joint Filing on Behalf of Each  Reporting
                    Person



<PAGE>


                                                           Page 10 of 12 Pages



                                    SIGNATURE


                  After reasonable  inquiry and to the best of its knowledge and
belief,  the  undersigned  certifies  that  the  information  set  forth in this
statement is true, complete and correct.


Dated: July 7, 1996

                                 DIGITAL IMAGING TECHNOLOGIES, INC.


                                 By:      /s/ James L. Hurn
                                 Name:    James L. Hurn
                                 Title:   Chief Executive Officer



<PAGE>


                                                        Page 11 of 12 Pages


SIGNATURE


                  After reasonable  inquiry and to the best of its knowledge and
belief,  the  undersigned  certifies  that  the  information  set  forth in this
statement is true, complete and correct.



Dated: July 7, 1996



                                Signature:  /s/ Edward Randall, III
                                Name:        Edward Randall, III



- --------------------------------------------------------------------------------
<PAGE>
                                                            Page 12 of 12 Pages


                                                                 APPENDIX A


                          DIRECTORS, EXECUTIVE OFFICERS
                                       AND
                               CONTROLLING PERSONS
                                       OF
                       DIGITAL IMAGING TECHNOLOGIES, INC.



         The following table sets forth the name,  business  address and present
principal  occupation or  employment of (a) each director and executive  officer
and (b) each controlling person of DITI. Unless otherwise  indicated below, each
such  person is a citizen  of the United  States of  America,  and the  business
address of each such  person is c/o Digital  Imaging  Technologies,  Inc.,  2950
North Loop West, Suite #1050,  Houston,  Texas 77092. Except as indicated below,
during the last five years,  none of the persons listed below has been convicted
in a criminal proceeding (excluding traffic violations or similar misdemeanors),
nor has any of such persons been a party to a civil  proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is  subject  to a  judgment,  decree  or  final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

                                            Present Principal Occupation or 
Name                                              Employment; Business Address

(a)  Executive Officers and Directors

James L. Hurn                               Chief Executive Officer and sole 
                                                  Director  
                                                 
                                                

(b)  Controlling Persons

Edward Randall, III                         Private investor.  The business 
                                            address of Mr. Randall is 
                                            5851 San Felipe, Suite 850,
                                            Houston, Texas 77057.



<PAGE>


                                                          

                                  EXHIBIT INDEX


Exhibit           Description


                    A. Asset Purchase  Agreement,  dated as of July 15, 1996, by
                    and  among  International  Remote  Imaging  Systems,   Inc.,
                    Digital Imaging  Technologies,  Inc.,  Perceptive Scientific
                    Instruments,  Inc. and Perceptive  Scientific  Technologies,
                    Inc.

                    B. Agreement, dated as of July 2, 1996, by and among Digital
                    Imaging    Technologies,    Inc.,    Perceptive   Scientific
                    Instruments,   Inc.,  Perceptive  Scientific   International
                    Limited,   Edward  Randall  III,  Anthony  G.  Landells  and
                    Marjorie Landells.

                    C.  Agreement  for Joint Filing on Behalf of Each  Reporting
                    Person



           
                                                                 EXHIBIT A

                                                      
                            ASSET PURCHASE AGREEMENT


                                  by and among


                   INTERNATIONAL REMOTE IMAGING SYSTEMS, INC.,
                             a Delaware corporation,

                       DIGITAL IMAGING TECHNOLOGIES, INC.,
                             a Delaware corporation,

                    PERCEPTIVE SCIENTIFIC INSTRUMENTS, INC.,
                             a Delaware corporation,

                                       and

                    PERCEPTIVE SCIENTIFIC TECHNOLOGIES, INC.,
                             a Delaware corporation,






                            Dated as of July 15, 1996

<PAGE>

                                TABLE OF CONTENTS

                                                                       Page


SECTION 1 AGREEMENT TO PURCHASE AND SELL...........................     1

  1.1      Acquisition.............................................     1
  1.2      Closing; Effective Date.................................     2
  1.3      Transfer of Assets......................................     2
  1.4      Purchase Price..........................................     2
           1.4.1    Amount.........................................     2
           1.4.2    Payment........................................     3
           1.4.3    Post-Closing Adjustment........................     3
  1.5      Assumption of Liabilities...............................     3
  1.6      Sales and Use Tax.......................................     4
  1.7      Allocation of Purchase Price............................     4

SECTION 2  REPRESENTATIONS AND WARRANTIES OF
           SELLER..................................................     4

  2.1      Existence and Rights......................................   4
  2.2      Agreements Authorized.....................................   4
  2.3      No Conflict...............................................   5
  2.4      Capitalization............................................   5
  2.5      Contingencies.............................................   5
  2.6      Financial Condition.......................................   6
  2.7      No Subsequent Changes.....................................   6
  2.8      Compliance with Laws......................................   6
  2.9      Title to Assets...........................................   7
  2.10     Intellectual Property.....................................   7
  2.11     Software..................................................   7
  2.12     Inventory.................................................   8
  2.13     Equipment and Personalty..................................   8
  2.14     Files.....................................................   8
  2.15     Product Liability.........................................   8
  2.16     Insurance.................................................   9
  2.17     Real Property.............................................   9
  2.18     Environmental Matters.....................................   9
  2.19     Material Assigned Contracts...............................   9
  2.20     Purchase Commitments and Sales Commitments................  10
  2.21     Business Relations........................................  10
  2.22     Affiliate Transactions....................................  11
  2.23     Benefit Plans.............................................  11
  2.24     Employment Matters........................................  11

                                       -i-


<PAGE>


                                                                  Page

   2.25     Accredited Investors; Investment Intent................   12

   2.26     Commissions............................................   12
   2.27     Taxes..................................................   13
   2.28     Accuracy of Information Furnished......................   13

   SECTION 3 REPRESENTATIONS AND WARRANTIES OF IRIS................   13

   3.1      Existence and Rights...................................   13
   3.2      Agreements Authorized..................................   14
   3.3      No Conflict............................................   14
   3.4      SEC Filings............................................   14
   3.5      Capitalization.........................................   15
   3.6      Contingencies..........................................   15
   3.7      No Material Changes....................................   15
   3.8      Compliance with Laws...................................   15
   3.9      IRIS Securities........................................   15
   3.10     Purchasing Inventory for Resale........................   15
   3.11     Commissions............................................   16
   3.12     Accuracy of Information Furnished......................   16

   SECTION 4 COVENANTS OF SELLER..................................    16

   4.1      Conduct of Business Prior to Closing....................  16
   4.2      Representations True....................................  17
   4.3      Access..................................................  17
   4.4      Supplemental Information................................  18
   4.5      Permits.................................................  18
   4.6      Security Interests......................................  18
   4.7      Closing Agreements......................................  18
   4.8      Legal Opinion...........................................  18

   SECTION 5 COVENANTS OF IRIS....................................    18

   5.1      Representations True..................................    18
   5.2      Supplemental Information..............................    18
   5.3      Permits...............................................    19
   5.4      Closing Agreements....................................    19
   5.5      Legal Opinion.........................................    19

   SECTION 6   CONDITIONS PRECEDENT TO OBLIGATIONS
               OF IRIS..............................................  19


                                      -ii-


<PAGE>

                                                                      Page

    6.1      Accuracy of Representations and Warranties............    19
    6.2      Compliance with Covenants.............................    19
    6.3      Consents Obtained; Filings............................    19
    6.4      No Material Adverse Effect............................    19

    6.5      Legal Actions or Proceedings..........................    20
    6.6      All Proceedings to Be Satisfactory....................    20
    6.7      Opinion of Counsel for Seller.........................    20
    6.8      Closing Agreements....................................    20
    6.9      Transfer Documents....................................    20
    6.10     Closing Documents.....................................    20
    6.11     Commissions...........................................    20
    6.12     Capital Stock of PSI..................................    20
    6.13     Pending Lawsuit.......................................    20

    SECTION 7 CONDITIONS PRECEDENT TO OBLIGATIONS OF
              SELLER...............................................    21

     7.1      Accuracy of Representations and Warranties...........    21
     7.2      Compliance with Covenants............................    21
     7.3      Consents Obtained; Filings...........................    21
     7.4      No Material Adverse Effect...........................    21
     7.5      All Proceedings to Be Satisfactory...................    21
     7.6      Opinion of Counsel for IRIS..........................    21
     7.7      Legal Actions or Proceedings.........................    21
     7.8      Closing Agreements...................................    22
     7.9      Closing Documents....................................    22
     7.10     Purchase Price.......................................    22

    SECTION 8 INDEMNIFICATION.......................................   23
     8.1      Right of Indemnification..............................   22
     8.2      Deductible Amount.....................................   22
     8.3      Survival of Representations; Effect of Disclosures....   22
     8.4      Time Limit............................................   22
     8.5      Procedures for Indemnification........................   22
     8.6      Cooperation...........................................   23

   SECTION 9 TERMINATION............................................   23

     9.1      Grounds for Termination...............................   23
     9.2      Effect of Termination.................................   24
     9.3      Rights to Proceed.....................................   24

                                      -iii-


<PAGE>

                                                                      Page
     9.4      Specific Performance.................................    24

     SECTION 10 OTHER COVENANTS....................................    25

     10.1     Confidentiality......................................    25
     10.2     Employment of Certain Personnel......................    25
     10.3     Change of Names......................................    26

     10.4     Collection of Accounts Receivable....................    26
     10.5     Notification of Suppliers and Distributors...........    26
     10.6     Non-Competition......................................    26
     10.7     Nominee to IRIS Board of Directors...................    26
     10.8     Cooperation by Seller................................    27
              10.8.1  Consulting Services..........................    27
              10.8.2  Additional Acts..............................    27
              10.8.3  Confirmation of Title........................    28
              10.8.4  Announcements................................    28
     10.9     Cooperation by Buyer.................................    28

     SECTION 11 DEFINITIONS........................................    28

     SECTION 12 MISCELLANEOUS......................................    35

      12.1     Entire Agreement; Modifications.....................    35
      12.2     Expenses............................................    36
      12.3     Waivers.............................................    36
      12.4     Cooperation.........................................    36
      12.5     Third-Party Benefits................................    36
      12.6     Successors and Assigns..............................    36
      12.7     Remedies Not Exclusive..............................    36
      12.8     Notices.............................................    37
      12.9     Governing Law; Consent to Jurisdiction..............    38
      12.10    Attorneys' Fees.....................................    38
      12.11    Headings............................................    38
      12.12    Severability........................................    38
      12.13    Arbitration of Disputes.............................    39
      12.14    Agreement Negotiated................................    39
      12.15    Counterparts........................................    39



                                      -iv-

<PAGE>



                            ASSET PURCHASE AGREEMENT


         This ASSET  PURCHASE  AGREEMENT (the  "Agreement")  is made and entered
into as of July 15, 1996, by and among  INTERNATIONAL  REMOTE  IMAGING  SYSTEMS,
INC., a Delaware  corporation  ("IRIS"),  on the one hand,  and DIGITAL  IMAGING
TECHNOLOGIES,  INC.,  a Delaware  corporation  ("DITI"),  PERCEPTIVE  SCIENTIFIC
INSTRUMENTS,  INC., a Delaware corporation  ("PSII"),  and PERCEPTIVE SCIENTIFIC
TECHNOLOGIES,  INC., a Delaware  corporation  ("PSTI"),  on the other hand, with
reference to the following facts:

         A. PSII and PSTI are wholly-owned  subsidiaries of DITI, and Perceptive
Scientific  International  Limited, a United Kingdom corporation  ("PSIL"), is a
majority-owned   subsidiary  of  PSII.   (PSII,  PSTI  and  PSIL  are  sometimes
hereinafter  referred to  collectively  as the "Operating  Companies," and DITI,
PSII  and  PSTI  are  sometimes  hereinafter  referred  to  collectively  as the
"Seller.")

         B.  Seller  is the owner of  certain  intellectual  property  and other
assets (as defined herein, the "Assets") used by the Operating  Companies in the
business of developing, manufacturing and marketing digital image processing and
analysis products and services,  including the proprietary PowerGene(TM) product
line of genetic analysis instruments.

         C. IRIS  desires to  purchase  the Assets from  Seller,  and Seller is
willing  to sell the  Assets  to IRIS,  on the terms  and  conditions  set forth
herein.

         D.  Concurrently  with the  purchase of the Assets,  IRIS will grant to
Perceptive  Scientific  Imaging  Systems,   Inc.,  a  Delaware  corporation  and
wholly-owned subsidiary of DITI ("PSISI"), a royalty-free,  exclusive license to
use all the technology purchased from Seller on a worldwide basis solely for use
in connection with the Well Log Business.

         E.       Capitalized terms not otherwise defined in the Agreement have
the meanings set forth in Section 11 of the Agreement.

         NOW, THEREFORE, based on the above premises and in consideration of the
mutual covenants and agreements contained herein, the parties agree as follows:



                                    SECTION 1

                         AGREEMENT TO PURCHASE AND SELL

         1.1  Acquisition.  On the terms and subject to the  conditions  of this
Agreement,  on the Closing Date,  Seller agrees to sell to IRIS, and IRIS agrees
to purchase from Seller,  the Assets in exchange for the payment of the Purchase
Price and the assumption of the Obligations.

                                       -1-



<PAGE>



         1.2 Closing;  Effective  Date.  Assuming  satisfaction or waiver of all
conditions set forth in Sections 6 and 7, the closing of the  Transactions  (the
"Closing")  will take place at the offices of Irell & Manella,  counsel to IRIS,
at 1800  Avenue of the Stars,  Suite 900,  Los  Angeles,  California  as soon as
practicable  after the date hereof, or at such other date, time and place as may
be mutually agreed upon in writing by the parties (the "Closing Date"). Assuming
the Closing  occurs,  the parties agree that the effective date shall be July 1,
1996 (the "Effective Date").

         1.3 Transfer of Assets.  At the Closing,  Seller will transfer,  assign
and  deliver the Assets to IRIS free and clear of any liens,  charges,  options,
adverse claims or security interests except the Obligations.  The parties intend
that IRIS have the benefit of, and Seller's  transfer and  assignment to IRIS of
the Assets include, all of Seller's existing rights and remedies pursuant to any
representations,  warranties, indemnifications,  covenants or agreements made by
any other party pursuant to any of the Assigned Contracts.

         1.4      Purchase Price.

                  1.4.1    Amount.  The "Purchase Price" shall consist of the 
following:

                  (i) an  amount of cash  equal to Nine  Million  Three  Hundred
Twenty-Eight Thousand Eight Hundred Twenty-One Dollars  ($9,328,821),  plus PSII
Year-to-Date EBIT (or minus PSII Year-to-Date EBIT if negative), minus PSII Cash
and  minus Net Cash  Transfers  to DITI (or plus Net Cash  Transfers  to DITI if
negative);

                  (ii)     an 8 1/2% Senior Subordinated Note due 2001 in the
principal amount of Seven Million Dollars ($7,000,000); and

                  (iii) an IRIS Warrant to purchase  Eight Hundred  Seventy-Five
Thousand  (875,000)  shares of IRIS Common  Stock at an exercise  price of Eight
Dollars ($8.00) per share.

For purposes of determining the Purchase Price,  "PSII  Year-to-Date EBIT" shall
mean the  consolidated  net income  (or loss) of the  Operating  Companies  from
January 1, 1996 through the Effective Date before  interest  expense  payable to
DITI and income taxes,  all determined in accordance  with GAAP, (i) including a
pro rata  allocation  of year-end  reserves and accruals and (ii)  including the
corporate  management  expenses  of DITI  properly  allocable  to the  Operating
Companies (which  percentage shall not be less than the percentage  allocated to
the  Operating  Companies  for the year ended  December 31,  1995)  (hereinafter
referred to as "Corporate Management Expenses"). "PSII Cash" shall mean the cash
and cash  equivalents of the Operating  Companies as of the close of business on
the Closing Date.  "Net Cash  Transfers to DITI" shall mean, for the period from
January 1, 1996  through  the Closing  Date,  (a) the  aggregate  amount of cash
transferred from the Operating  Companies to DITI, (b) plus the aggregate amount
of cash paid

                                       -2-



<PAGE>



directly to any creditor of DITI, the  Controlling  Stockholder or any Affiliate
of the Controlling  Stockholder  (including,  without limitation,  principal and
interest payments to Southwest Bank of Texas), (c) minus the aggregate amount of
cash advanced by DITI to the Operating Companies and (d) minus payments from the
Operating  Companies  to DITI  for  Corporate  Management  Expenses.  All of the
expenses of Seller related to the Transactions  (including,  without limitation,
commissions,  legal  fees,  employee  bonuses  and the cost of  reacquiring  the
minority  interest in PSIL) shall be incurred and paid solely by DITI and not by
any of the Operating Companies.

                  1.4.2  Payment.  On the  Closing  Date,  IRIS  shall  (i) wire
transfer to an account  designated in writing by DITI the Estimated Cash Portion
of the  Purchase  Price  and  (ii)  execute  and  deliver  to  DITI  the  Senior
Subordinated  Note and the IRIS Warrant.  As far in advance of the Closing as is
practicable,  DITI  shall  prepare  and  deliver  to  IRIS  reasonably  detailed
estimates of PSII  Year-to-Date  EBIT, PSII Cash and Net Cash Transfers to DITI.
The "Estimated  Cash Portion of the Purchase  Price" payable at Closing shall be
Nine Million  Three  Hundred  Twenty-Eight  Thousand  Eight  Hundred  Twenty-One
Dollars  ($9,328,821)  plus estimated PSII Year-to-Date EBIT (or minus estimated
PSII  Year-to-Date  EBIT if  negative),  minus  estimated  PSII  Cash and  minus
estimated Net Cash  Transfers to DITI (or plus  estimated Net Cash  Transfers to
DITI if negative).

                  1.4.3 Post-Closing Adjustment. Not more than 60 days after the
Closing,  DITI,  with the full  cooperation of IRIS employees and full access to
the Files,  shall prepare and deliver to IRIS (i) a final  determination of PSII
Year-to-Date  EBIT,  PSII  Cash and Net Cash  Transfers  to DITI,  (ii)  audited
consolidated financial statements of PSII as of and for the 6-month period ended
on the Effective  Date,  together with an unqualified  auditor's  report thereon
from  Buffington & Company,  P.C., and (iii)  unaudited  consolidated  financial
statements  of PSII as of the Closing Date and for the period from the Effective
Date to the  Closing  Date.  The  cost of the  auditor's  report  shall be borne
equally by each party.  IRIS shall have up to 90 days  thereafter to review and,
at its expense,  cause Coopers & Lybrand,  LLP to review the  calculation of the
Purchase Price on its behalf to ensure that it has been calculated  consistently
with  Section  1.4.1.  If  IRIS  believes  that  any  material  aspect  of  such
calculation has not been prepared  appropriately,  Coopers & Lybrand shall,  not
later than the end of such 90-day period,  contact Buffington & Company,  acting
on behalf,  and at the expense,  of Seller to attempt to resolve the matter.  If
they are  unable  to  resolve  the  matter  within  45 days  from the date  that
Buffington & Company is first  contacted,  Seller and IRIS shall request another
firm  designated  by the first two  accounting  firms to  determine  the  matter
subject  to  disagreement,  and the  determination  so made  shall be final  and
binding on all  parties.  The fees of the third  firm shall be borne  equally by
each party.  Seller shall promptly refund to IRIS in cash the amount (if any) by
which the amount  paid at Closing  exceeds  the  Purchase  Price,  or IRIS shall
promptly pay to Seller cash in the amount (if any) by which the  Purchase  Price
exceeds the amount paid at Closing.


                                       -3-



<PAGE>



         1.5 Assumption of Liabilities.  At the Closing,  IRIS shall assume, and
thereafter will perform, pay or otherwise satisfy in accordance with their terms
as and when due, all of the Obligations. IRIS shall not assume nor be liable for
any other obligations,  debts,  contracts or liabilities of Seller. Seller shall
indemnify  and hold harmless IRIS from and against the full amount of any Losses
incurred by IRIS with respect to claims based on any alleged obligations, debts,
contracts  or  liabilities  of Seller not  expressly  assumed by IRIS under this
Section 1.5.

          1.6 Sales and Use Tax.  IRIS and Seller  shall  cooperate in preparing
and filing use and sales tax returns relating to, and Seller shall pay any sales
or use tax due with regard to, the Transactions.

         1.7  Allocation  of Purchase  Price.  The parties  have  negotiated  an
allocation of the Purchase  Price,  including the portion of the Purchase  Price
attributable  to  particular  Assets,  among the Assets and other matters as set
forth on Schedule 1.7. Each of the parties agrees (i) to report the Transactions
for federal and state income tax purposes in  accordance  with this  allocation,
(ii) to not take any  position  inconsistent  with  such  allocation  on its tax
returns  without the  consent of the other and (iii) to timely file  federal tax
Form 8594 (Asset  Acquisition  Statement) with the applicable tax return for the
year of the  Transactions.  Each party shall provide the other with a draft copy
of its federal tax form 8594 at least fifteen (15) days prior to filing it.


                                    SECTION 2

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         As an inducement for IRIS to enter into this Agreement,  DITI, PSII and
PSTI,  jointly  and  severally,  represent  and warrant to IRIS that each of the
following statements is true, correct and complete as of the date hereof:

         2.1 Existence and Rights.  Each of DITI, PSII and PSTI is a corporation
duly  incorporated,  validly existing and in good standing under the laws of the
State of Delaware.  PSIL is a corporation duly incorporated and validly existing
under the laws of the United Kingdom.  DITI and each of the Operating  Companies
(i) has the  corporate  power and  authority,  rights and  franchises to own its
properties,  to carry on its business as now conducted and to make and carry out
the  Transactions  and  (ii) is duly  qualified  and in  good  standing  in each
jurisdiction  in which the  character of its business  makes such  qualification
necessary.

         2.2 Agreements Authorized.  The execution,  delivery and performance by
Seller  of this  Agreement  and each  Closing  Agreement  to  which  DITI or any
Operating  Company  is  listed  as a party  have  been  duly  authorized  by all
necessary corporate action (including, without limitation, shareholder approval)
and, except as set forth on

                                       -4-


<PAGE>



Schedule  2.2,  do not require  notice to, or the  consent or  approval  of, any
governmental body, regulatory authority or other person. This Agreement has been
duly  executed  and  delivered  by  Seller  and is a legal,  valid  and  binding
obligation of Seller  enforceable  against Seller in accordance  with its terms,
subject to bankruptcy, insolvency,  reorganization,  moratorium or other similar
laws affecting or relating to creditors' rights generally and general principles
of equity.  Upon execution and delivery by DITI or any Operating  Company,  each
Closing  Agreement  to which  such  entity is listed as a party will be a legal,
valid and binding obligation of such entity  enforceable  against such entity in
accordance with its terms,  subject to bankruptcy,  insolvency,  reorganization,
moratorium  or other  similar laws  affecting or relating to  creditors'  rights
generally and general principles of equity.

         2.3 No Conflict. Subject to obtaining the consents in Schedule 2.2, the
execution, delivery and performance by Seller of this Agreement and each Closing
Agreement to which DITI or any  Operating  Company is listed as a party will not
(i) breach or constitute  grounds for the occurrence or declaration of a default
under or allow another party a right to terminate any Material Assigned Contract
or other material agreement, indenture, undertaking or other instrument to which
DITI or any  Operating  Company is a party or by which they or any of the Assets
are bound  (including  by virtue of any "key person"  clause);  (ii) violate any
provision of Law;  (iii) violate any provision of the Articles of  Incorporation
or Bylaws of DITI or any  Operating  Company;  or (iv) result in the creation or
imposition of any lien,  charge or encumbrance on, or security  interest in, any
of the Assets.  Seller is a "person"  with total  assets and annual net sales of
less than  $100,000,000 as determined in accordance  with the  Hart-Scott-Rodino
Antitrust  Improvement Act of 1976, as amended, and the regulations  promulgated
thereunder.

         2.4 Capitalization.  The Controlling  Stockholder is the beneficial and
record owner of a majority of the  outstanding  shares of capital stock of DITI,
and DITI is the beneficial and record owner of all of the outstanding  shares of
capital stock of PSII,  PSTI and PSISI.  PSII and Tony Landells,  an employee of
PSIL, are the beneficial and record owners of 75% and 25%, respectively,  of the
outstanding ordinary shares of PSIL, and PSII is the beneficial and record owner
of all the outstanding preferred shares of PSIL. PSII will be the beneficial and
record owner of all the outstanding shares of capital stock of PSIL on or before
the Closing Date.  Except as set forth on Schedule 2.9, there are no outstanding
options,  warrants,  convertible debt securities or other rights to purchase any
shares of capital stock of DITI, PSISI or any Operating Company.

         2.5  Contingencies.  Except as set forth in the notes to the  Financial
Statements or on Schedule  2.5, (i) neither DITI nor any Operating  Company is a
party to any express warranty or similar guarantee with respect to any Inventory
or other products  previously sold or leased by it, (ii) there is no litigation,
arbitration,  other proceedings,  written audit requests or, to the knowledge of
Seller,  investigations  pending against DITI or any Operating  Company,  any of
their  officers or directors (in their  capacities  as such) or the Assets,  and
(iii) to the knowledge of Seller,  there is no threat of, or a reasonable  basis
for,

                                       -5-



<PAGE>



any such litigation,  arbitration,  other proceedings or written audit requests,
the results of which  could  reasonably  be expected to have a Material  Adverse
Effect. Neither DITI nor any Operating Company is in default with respect to any
order,  writ,  injunction  or  decree  of any  court  or other  governmental  or
regulatory authority.

         2.6 Financial Condition. The Financial Statements, correct and complete
copies of which are attached hereto as Schedule 2.6, (i) are true and correct as
of the date  thereof;  (ii)  fairly  and  accurately  present  the  consolidated
financial  condition  of  DITI  and  PSII  as  of  the  dates  thereof  and  the
consolidated  results of the operations of DITI and PSII for the periods covered
thereby;  and (iii) have been  prepared  in  accordance  with GAAP.  To the best
knowledge of Seller, except as set forth in the Financial Statements,  the notes
thereto or Schedule 2.5, DITI and the Operating Companies did not have more than
$30,000 in the aggregate of  liabilities  or  guarantees,  matured or unmatured,
contingent or otherwise,  as of the date of the Financial  Statements which were
not accurately reflected in the Financial Statements, and none have arisen since
that  time  except  in the  ordinary  course  of  the  Business.  The  Financial
Statements include adequate reserves for contracts, commitments,  warranties and
contingent liabilities to the extent required by GAAP.

         2.7 No Subsequent  Changes.  Except as set forth on Schedule 2.7, since
December 31, 1995, (i) there has not been any Material  Adverse  Effect,  or any
occurrence  or event  which  could  reasonably  be  expected  to have a Material
Adverse  Effect;  (ii) neither DITI or any  Operating  Company has entered into,
amended or terminated any commitments,  contracts or transactions, or waived any
contractual  rights,  except in the ordinary  course of business,  none of which
individually or in the aggregate could reasonably be expected to have a Material
Adverse  Effect;  and (iii) neither DITI nor any Operating  Company has made any
change in its accounting  methods or practices or any revaluations of any Assets
or any reserves or liabilities  associated  therewith.  Since December 31, 1995,
neither DITI nor PSII has directly or indirectly  paid,  declared,  or set aside
any  dividends or  distributions  with respect to, nor  repurchased,  any of its
capital stock or securities of any class.  Since December 31, 1995, neither DITI
nor any Operating  Company has paid any interest on, or repaid any principal of,
any debt owed to the Controlling Stockholder or any of his Affiliates. Except as
set  forth on  Schedule  2.7,  there  has been no  acquisition,  disposition  or
transfer of  Inventory,  Equipment,  Personalty  or other  Assets  except in the
ordinary  course of business  since  December  31,  1995.  Without  limiting the
foregoing,  since December 31, 1995, there has been no transfer of cash or other
assets from any of the Operating  Companies to, or for the behalf of, DITI,  the
Controlling  Stockholder or any Affiliate of the Controlling  Stockholder  other
than  transfers of cash  includable in the  definition of "Net Cash Transfers to
DITI" as a reduction to the Purchase Price.

         2.8  Compliance  with Laws. The business and operations of DITI and the
Operating  Companies are and have been in compliance with all Laws, except where
the  failure to so comply  could not  reasonably  be expected to have a Material
Adverse  Effect.  DITI and the Operating  Companies have all permits,  licenses,
orders, authorizations,

                                       -6-



<PAGE>



registrations,  approvals  and  other  analogous  instruments  (each of which is
listed on Schedule 2.8, is in full force and effect and,  except as disclosed on
Schedule 2.8, can be transferred  without any consent or filing),  and they have
made all filings and  registrations  and the like, which are necessary or proper
to conduct the  Business,  except where the failure to maintain such permits and
other instruments or to make such filings and registrations could not reasonably
be expected to have a Material Adverse Effect.

         2.9 Title to Assets.  Except as disclosed on Schedule 2.9, DITI and the
Operating  Companies have good and marketable title to the Assets free and clear
of any liens, charges,  options, adverse claims or security interests except the
Obligations.  The Assets include all of the assets necessary or actually used to
conduct the Business.

         2.10 Intellectual Property.  Except as disclosed on Schedule 2.10, DITI
and the Operating  Companies are the  exclusive  owners of all the  Intellectual
Property.  Schedule 2.10 correctly lists all the Patents,  registered Copyrights
and  registered  Trademarks,  the  jurisdictions  in which  they were  issued or
registered,  the date of issuance or registration and the identification  number
assigned thereto. The Patents,  registered  Copyrights and registered Trademarks
are valid and  enforceable  in the  jurisdictions  in which they were  issued or
registered, as applicable. There are no options, licenses, royalty agreements or
encumbrances of any kind relating to the Intellectual Property other than as set
forth on Schedule  2.10.  The  Operating  Companies  possess the right to use in
perpetuity  (without  royalty or other  payment  except as disclosed on Schedule
2.10) all  Intellectual  Property  necessary  or  actually  used to conduct  the
Business.  Assuming  execution of the New Employment  Contracts,  the failure of
present and former  employees and  consultants of DITI, the Operating  Companies
and their respective predecessors to execute Employee Patent and Confidentiality
Agreements  will not have a Material  Adverse  Effect.  Schedule 2.10  correctly
lists all past and present  litigation,  arbitration or other disputes involving
any of the Intellectual Property (and the outcome or present status thereof). To
the best knowledge of Seller, the operation of the Business,  including, but not
limited  to, the making,  use,  or sale of any Product by DITI or any  Operating
Company,  does not violate or infringe  any U.S. or foreign  patent,  copyright,
trademark, service mark, trade secret or other proprietary interest of any other
person.  Without  limiting the  foregoing,  the operation of the Business by the
Operating Companies,  including, but not limited to, the making, use, or sale of
any Product by DITI or any Operating Company,  does not violate or infringe U.S.
Patent No. 5,447,841 (Methods for  Chromosome-Specific  Staining) or any foreign
counterpart  thereof.  Further,  to the best  knowledge of Seller,  no person is
contesting  Seller's  rights  in or to or  violating  or  infringing  any of the
Intellectual Property.

         2.11  Software.  Schedule 2.11 contains a complete and accurate list of
the  Software.  Except  as set  forth  on  Schedule  2.10 or  2.11,  PSTI is the
exclusive owner of the Software  (including the exclusive  right to make,  copy,
sell,  exploit and provide to others the use of the Software and all  derivative
works  thereof)  free  and  clear  of  any  liens,  options,  licenses,  royalty
agreements or encumbrances of any kind. PSTI is in actual and

                                       -7-



<PAGE>



sole  possession  of, and the Assets  include,  the complete  source code of the
Software and all related design  documentation.  Except as set forth on Schedule
2.11,  each author of the Software,  and every other person who  participated in
the  development  of the Software or any portion  thereof or performed  any work
related thereto (collectively, the "Software Authors"), made his contribution to
the Software  within the scope of his employment by an Operating  Company or one
of their  predecessors  as a "work for  hire."  Except as set forth on  Schedule
2.11,  the  Software  and every  portion  thereof is an original  creation of an
Operating  Company or one of their  predecessors and does not contain any source
code or portions of source code (including any "canned  program") created by any
parties other than the Software  Authors.  Any defects in the Software,  and any
errors in the related design documentation, are not, in the aggregate, excessive
in light of industry  standards.  The Software has in all material  respects the
features described in the design  documentation or advertisements made available
to  customers  and,  to the best  knowledge  of  Seller,  does not  contain  any
"viruses" (as that term is commonly used in the computer software industry).  To
the best knowledge of Seller,  the use and sale of the Software in the operation
of the  Business  does not  violate or  infringe  any U.S.  or  foreign  patent,
copyright,  trademark,  service mark, trade secret or other proprietary interest
of any other person.  Further,  to the best of knowledge of Seller, no person is
contesting  Seller's  rights in or to the Software or is violating or infringing
any of the Software.

         2.12 Inventory.  The Inventory reflected in the Financial Statements or
thereafter  acquired by any Operating  Company,  consists of items of a quantity
and quality usable or salable in the ordinary course of the Business.  Except as
disclosed on Schedule 2.12,  neither DITI nor any Operating Company is under any
liability or obligation  with respect to the return of inventory or  merchandise
in the possession of others. Seller has not received written or oral notice that
any Operating  Company will  experience in the  foreseeable  future any material
difficulty in obtaining, in the desired quantity and quality and at a reasonable
price and upon  reasonable  terms and conditions,  the raw materials,  services,
supplies or component  products  required for the Business.  The values at which
inventories  are  carried on the  Financial  Statements  reflect  the  inventory
valuation policy of DITI and the Operating Companies in accordance with GAAP.

         2.13 Equipment and  Personalty.  Schedule 2.13 is a complete,  accurate
and correct  list of all  Equipment  not in  possession  of DITI or an Operating
Company,  the  location  thereof,  the  party  in  possession  thereof  and  any
arrangements or understandings  regarding the possession thereof.  The Equipment
and Personalty is in good operating condition, ordinary wear and tear excepted.

         2.14 Files.  The Files  include,  among other things,  (a) all Customer
Lists  in the  possession  of  DITI  or an  Operating  Company  and  which  were
obtainable from  distributors  after reasonable  efforts,  (b) all documentation
relating  to all other  Intellectual  Property,  (c) all  documents  relating to
customer complaints and (d) all documentation  relating to quality assurance and
quality control.

                                       -8-



<PAGE>



         2.15 Product Liability. There are no statements, citations or decisions
by any governmental or regulatory body that any product  manufactured,  marketed
or  distributed  at any time by DITI or any  Operating  Company (a "Product") is
defective or fails to meet in any material respect any standards  promulgated by
any such  governmental or regulatory  body,  including,  but not limited to, the
FDA, and, to the best knowledge of Seller,  no governmental or regulatory  body,
including,  but not  limited  to,  the FDA,  intends  to  notify  Seller  of any
violation  of such  promulgated  standards,  including,  but not limited to, the
Federal Food, Drug and Cosmetics Act, the regulations  promulgated thereunder or
any comparable  state or foreign law or  regulation.  There have been no recalls
ordered by any such governmental or regulatory body with respect to any Product.
There is no (a) fact  relating  to any  Product  that  imposes  upon DITI or any
Operating  Company (or IRIS upon  consummation of the transactions  contemplated
hereby) a duty to recall any Product or a duty to warn  customers of a defect in
any Product or (b), to the best  knowledge  of Seller,  latent or overt  design,
manufacturing  or other  defect in any  Product.  To the extent  required  under
applicable Law, each Product has been cleared for marketing in the United States
by the FDA and in  every  other  country  in which  such  Product  is  currently
marketed by a comparable governmental agency.

         2.16  Insurance.  The material  properties  and assets of DITI and each
Operating  Company which are of an insurable  character are insured against loss
or  damage  by fire and  other  customary  risks,  and  DITI  and the  Operating
Companies have liability and worker's  compensation  insurance with  independent
carriers,  in each case to the extent and in the manner  customary for companies
engaged in a similar business or owning similar assets.  Schedule 2.16 correctly
sets  forth all  policies  of  insurance  maintained  by DITI and the  Operating
Companies,  the  amount and type of  coverage  and the  expiration  date of such
coverage.

         2.17 Real Property.  Schedule 2.17  correctly  identifies all the real
property used in the Business,  all of which is leased to an Operating  Company.
The leases for such property are listed on Schedule 2.19 as part of the Material
Assigned Contracts.                      
                  
         2.18 Environmental Matters.  Except as set forth on Schedule 2.18, DITI
and each Operating  Company has been, and is, in full compliance in all material
respects with all Laws  relating to pollution or protection of the  environment,
including  Laws relating to (i)  emissions,  discharges,  releases or threatened
releases or discharges of materials  constituting  Hazardous  Materials into the
environment  (including,  without  limitation,  ambient air, surface water, land
surface or subsurface strata) or (ii) the manufacture, processing, distribution,
use, treatment,  storage, disposal, transport or handling of Hazardous Materials
(collectively,  "Environmental  Laws") and with all terms and conditions of, all
permits,  licenses and other  authorizations  required for the  operation of the
Business  under  any  Environmental   Law.  There  is  no  civil,   criminal  or
administrative  action,  suit,  demand,  claim,  hearing,  notice of  violation,
investigation,  proceeding, notice or demand letter under the Environmental Laws
pending,  or, to the best  knowledge of Seller,  threatened  against DITI or any
Operating Company. Seller has delivered to IRIS

                                       -9-


<PAGE>



true and complete copies of all environmental audits, reports and inspections in
its  possession  or control  relating to any real property used in the Business.
Notwithstanding  anything to the contrary  contained in this  Agreement,  Seller
makes no  representations  or warranties with respect to  Environmental  Laws or
other environmental matters except as set forth in this Section 2.18.

         2.19 Material Assigned Contracts.  Schedules 2.10 and 2.19 collectively
set forth a correct and complete  list of all the Material  Assigned  Contracts,
including  all  amendments,   modifications  and  waivers  thereto.  Seller  has
previously  delivered  to IRIS  true and  complete  copies  of all the  Material
Assigned  Contracts (or, in the case of oral Material Assigned  Contracts,  true
and correct summaries  thereof).  "Material  Assigned  Contracts" shall mean all
Assigned  Contracts  which are  material  to the  Business,  including,  without
limitation,  all Assigned Contracts (a) relating to Intellectual  Property,  (b)
involving  real property,  (c) relating to  distributorships,  (d)  constituting
capital leases,  (e) constituting  operating leases with aggregate payments over
the life of the lease  (assuming  exercise of all options) in excess of $30,000,
(f) involving  joint  ventures,  partnerships  and similar  arrangements  or (g)
having a term (whether or not  cancelable)  of more than one year or potentially
involving  the  payment  or receipt  of more than  $30,000  in any  twelve-month
period.  Except as disclosed  on Schedule  2.19,  each of the Material  Assigned
Contracts  (including all  amendments,  modifications  and waivers) (a) has been
duly  authorized,  executed and  delivered by DITI,  PSII,  PSTI and/or PSIL, as
applicable, and, to the best knowledge of Seller, the other parties thereto, (b)
remains  in full  force and  effect  to the  extent  of its  terms  without  any
amendment, modification or waiver not reflected in the copies thereof previously
delivered to IRIS, (c) is binding on the parties  thereto in accordance with and
to the  extent  of  its  terms  and  applicable  Laws,  subject  to  bankruptcy,
insolvency,  reorganization,  moratorium  or other  similar  laws  affecting  or
relating to creditors rights generally and general  principles of equity and (d)
will not be breached by the assignment  thereof to IRIS. Seller has not received
any letter or other written notice  threatening or declaring  termination of any
Material  Assigned  Contract and does not know of any  reasonable  basis for any
claim of default by it or any other  party to any  Material  Assigned  Contract.
Seller is not restricted by agreement from carrying on the Business or any other
line of business  anywhere in the world,  and, to the best  knowledge of Seller,
none of the employees of DITI or any Operating  Company is bound by any contract
or  restriction  which has or could be  reasonably  expected  to have a Material
Adverse Effect.

         2.20 Purchase  Commitments  and Sales  Commitments.  Schedule 2.20 is a
true and complete list of (i) all Purchase Commitments under which any Operating
Company is obligated,  or will become obligated to, pay any particular vendor an
aggregate sum in excess of $30,000;  (ii) all Sales  Commitments under which any
Operating  Company is obligated,  or will become  obligated to, deliver products
and/or perform  services for an aggregate  price to any  particular  customer in
excess  of  $30,000;  and  (iii) all bids or  proposals  (together  with a brief
description  of each of same)  submitted by any  Operating  Company  pursuant to
which it may become obligated to deliver products

                                      -10-



<PAGE>



and/or services for an aggregate  price to any particular  customer in excess of
$30,000. Seller has previously delivered to IRIS true and complete copies of all
such  Purchase  Commitments  and  Sales  Commitments  (or,  in the  case of oral
Purchase Commitments and Sales Commitments, true and correct summaries thereof).

         2.21 Business  Relations.  DITI and the Operating  Companies  have good
commercial   working   relationships   with  their   customers,   suppliers  and
distributors.  Seller  has  not  received  notice  that  any of  its  customers,
suppliers or distributors  intends to terminate or alter its  relationship  with
DITI or any Operating Company except for terminations or alterations which would
not, in the aggregate,  have a Material Adverse Effect.  Seller has not received
notice from customers, suppliers or distributors that the Transactions will have
a material adverse effect on the Business after the Closing.

         2.22 Affiliate Transactions. Except as disclosed on Schedule 2.22 or in
the notes to the Financial Statements,  neither the Controlling  Stockholder nor
any of his  Affiliates  (i) owns (other than  ownership of less than one percent
(1%) of the stock of a publicly  traded  corporation),  directly or  indirectly,
individually  or  collectively,  any interest in any  corporation,  partnership,
firm,  association  or  sole  proprietorship,  which  is  either  a  competitor,
potential competitor, customer, supplier or distributor of DITI or any Operating
Company or has an existing  contractual  relationship with DITI or any Operating
Company; or (ii) owes any money to or is owed any money by DITI or any Operating
Company.

         2.23  Benefit  Plans.  Schedule  2.23  accurately  reflects  all of the
deferred  compensation  plans and arrangements  maintained by DITI or any of the
Operating Companies,  including profit sharing,  pension, savings, stock option,
stock  bonus and  defined  contribution  plans.  Such  Schedule  identifies  all
"employee  benefit  plans"  within the  meaning of  Section  3(2) of ERISA,  all
"multiemployer  plans" within the meaning of Section 3(37) of ERISA, all benefit
plans  maintained  outside  the  United  States  primarily  for the  benefit  of
non-resident  aliens, in each case with respect to which any material  liability
under  ERISA or  otherwise  may be  incurred  by DITI or any  Operating  Company
(singularly,  a "Plan," and collectively,  the "Plans").  Except for Plans which
are multiemployer plans, no Plan is a defined benefit plan within the meaning of
Section 3(35) of ERISA. Neither DITI nor any Operating Company is a "substantial
employer"  with  regard  to any  multiemployer  plan.  Each Plan is and has been
operated and  administered in accordance with its provisions and applicable law,
except where the failures to do so, individually or in the aggregate,  could not
reasonably  be expected  to have a Material  Adverse  Effect,  and to the extent
required,  is  "qualified"  within the  meaning of 401(a) of the Code,  and each
related trust is exempt from  taxation  under  Section  501(a) of the Code,  and
Seller knows of no current matter which might  materially  affect such statuses.
As to facts existing on the date hereof, with respect to any Plan which is not a
multiemployer  plan and, to the best of Seller's  knowledge  with respect to any
Plan which is a  multiemployer  plan,  there is not, and there are no reasonable
grounds to expect,  any (i) present liability under ERISA or comparable  foreign
Laws which has been or may be

                                      -11-



<PAGE>



incurred  by Seller or any  Subsidiary;  (ii)  "reportable  event" as within the
meaning  of Section  406 of ERISA;  or (iii)  termination  of any Title IV Plans
which  liability,  termination  or  reportable  event,  individually  or in  the
aggregate,  could reasonably be expected to have a Material  Adverse Effect.  To
the best knowledge of Seller, no persons connected with any Plan have engaged in
non-exempt "prohibited  transactions" within the meaning of Section 406 of ERISA
which, individually or in the aggregate,  could reasonably be expected to have a
Material Adverse Effect. Neither DITI nor any Operating Company has violated any
of the health care  continuation  coverage  requirements of Section 4980B of the
Code.

                  2.24 Employment  Matters.  There is no pending or (to the best
knowledge of Seller)  threatened  litigation by any employees or  consultants of
DITI or any  Operating  Company,  and  there  are no  pending  or (to  the  best
knowledge of Seller) threatened administrative actions or claims with respect to
the relationship of DITI or any Operating Company to any employee or consultant,
including,  without  limitation,  discrimination  claims  (whether for sex, age,
race, religion, national origin or any other reason). There are no controversies
regarding compensation or other terms of employment pending or, to the knowledge
of Seller, threatened with any employee(s) of DITI or any Operating Company (nor
have there been any such controversies  during the past three years) which could
reasonably be expected to have a Material  Adverse  Effect,  and Seller does not
know of any  organizational  efforts  presently being made involving any of such
employees.  No Key Employee has recently terminated or, to the best knowledge of
Seller,  has any  plans to  terminate  his or her  employment  with DITI and the
Operating  Companies.  Schedule 2.24 lists all the  employment  agreements  with
employees of Operating Company and the names and current  compensation levels of
each  employee  of any  Operating  Company  with  a  total  annual  compensation
(including  reasonably  anticipated  bonus payments) over Sixty Thousand Dollars
($60,000),  and all  collective  bargaining  agreements  or other  contracts  or
commitments  to or with any labor unions or other  employee  representatives  or
groups of employees (the "Existing Employment Contracts").

         2.25 Accredited  Investors;  Investment Intent.  DITI is an "Accredited
Investor"  as defined in Rule 501 of  Regulation D  promulgated  pursuant to the
Securities  Act. All of the  stockholders  of DITI are residents of the State of
Texas. DITI is acquiring the Senior  Subordinated Note and the IRIS Warrant (and
if the IRIS Warrant is exercised,  will acquire shares of IRIS Common Stock) for
its own account and not with a view to the resale or  distribution of any or all
of such securities in violation of the Securities  Act, or any applicable  state
securities  laws,  and DITI will not dispose of such  securities in violation of
the Securities Act or any applicable state  securities  laws. DITI  acknowledges
that the  Senior  Subordinated  Note,  the IRIS  Warrant  and the shares of IRIS
Common Stock  issuable  upon exercise of the IRIS Warrant will not be registered
under the  Securities  Act or any state  securities  laws  except to the  extent
provided in the  Registration  Rights/Standstill  Agreement.  As a result,  such
securities cannot be sold, and must be held  indefinitely,  unless  subsequently
registered under the Securities Act and

                                      -12-



<PAGE>



applicable state  securities laws or unless an exemption from such  registration
is available.  Consequently, DITI understands that any certificates representing
such  securities  will contain a legend setting forth  restrictions  on transfer
under such securities  laws and the  Registration  Rights/Standstill  Agreement.
Further, DITI acknowledges and understands that IRIS is and will be issuing such
securities  pursuant to, and in reliance on, an exemption from the  registration
requirements  of the  Securities Act and any applicable  state  securities  laws
which is, in part,  dependent on the representations and warranties made in this
Section 2.25.

         2.26 Commissions.  Except as provided in Schedule 2.26,  neither Seller
nor any of its officers, directors, agents or employees has employed or incurred
any liability to any broker,  finder or agent for any brokerage  fees,  finder's
fees, commissions or other amounts with respect to the Transactions,  and Seller
agrees to hold IRIS harmless  from and against any Losses  incurred by reason of
any contrary assertions.

         2.27  Taxes.  Except  as  disclosed  on  Schedule  2.27,  DITI and each
Operating  Company has (i) timely  filed all  returns  for Taxes  required to be
filed on or before the date hereof or has obtained  extensions  (without penalty
or interest) of the deadline for filing; (ii) paid or adequately reserved on the
balance sheets contained in the Financial  Statements for all Taxes owed on such
date; (iii) adequately  reserved for deferred Taxes in accordance with GAAP; and
(iv)  duly  withheld,  collected  and  paid  over  to  the  proper  governmental
authorities  all  Taxes  and  assessments  required  to have  been  withheld  or
collected and paid over by such entities, all as and to the extent prescribed by
law.  Except as  disclosed  on Schedule  2.27,  neither  DITI nor any  Operating
Company  has been  advised of any  deficiency  claimed or proposed to be claimed
against or  relating to any of them by any taxing  authority  which has not been
paid, settled or adequately reserved for in the Financial Statements,  and there
are no matters under discussion with any taxing authority which might reasonably
result in the  assessment of additional  amounts  against or relating to DITI or
any  Operating  Company.  There are no liens for Taxes  (other  than for current
Taxes not yet due and payable) upon the Assets.  PSIL is not a party to or bound
by any tax indemnity,  tax sharing or tax allocation  agreement.  PSIL has never
been a member of an  affiliated  group of  corporations  within  the  meaning of
Section  1504 of the  Code.  PSIL has never  been a party to any joint  venture,
partnership,  or other  arrangement  or  contract  which  could be  treated as a
partnership for federal or foreign income tax purposes.

         2.28  Accuracy  of  Information  Furnished.  To the best  knowledge  of
Seller,  no statement or information  contained in any schedule,  certificate or
other document or information furnished,  or to be furnished, by or on behalf of
Seller (i) contains or will contain any untrue  statement of a material fact, or
(ii) omits or will omit to state a material fact  necessary in order to make the
statements  contained therein,  in light of the circumstances under which it was
made,  not  misleading,  except  where such untrue  statement  or  omission  was
corrected in subsequent  information  delivered or made available to IRIS or its
representatives by Seller or its representatives.

                                      -13-



<PAGE>




                                    SECTION 3

                     REPRESENTATIONS AND WARRANTIES OF IRIS

         As an inducement for DITI,  PSII and PSTI to enter into this Agreement,
IRIS  represents and warrants to DITI,  PSII and PSTI that each of the following
statements is true, correct and complete as of the date hereof:

         3.1 Existence and Rights.  IRIS (i) is a  corporation  duly  organized,
validly  existing and in good  standing  under the laws of the State of Delaware
and (ii) has the corporate power and authority to own its  properties,  to carry
on its business as now conducted and to make and carry out the Transactions.  On
or prior to the Closing Date,  IRIS will be duly  qualified and in good standing
as a foreign corporation in the State of Texas.

         3.2 Agreements Authorized.  The execution,  delivery and performance by
IRIS of this  Agreement and the Closing  Agreements to which IRIS is listed as a
party have been duly authorized by all necessary corporate action and, except as
set forth on Schedule 3.2, do not require  notice to, or the consent or approval
from,  any  governmental  body,  regulatory  authority  or  other  person.  This
Agreement has been duly executed and delivered by IRIS and is a legal, valid and
binding  obligation  of IRIS  enforceable  against IRIS in  accordance  with its
terms, subject to bankruptcy,  insolvency,  reorganization,  moratorium or other
similar laws  affecting or relating to creditors'  rights  generally and general
principles  of  equity.  Upon  execution  and  delivery  by  IRIS,  the  Closing
Agreements will be legal,  valid and binding  obligations of IRIS enforceable in
accordance with their terms, subject to bankruptcy, insolvency,  reorganization,
moratorium  or other  similar laws  affecting or relating to  creditors'  rights
generally and general principles of equity.

         3.3 No Conflict. The execution,  delivery and, subject to obtaining the
consents in Schedule 3.2, performance by IRIS of this Agreement and each Closing
Agreement  to which IRIS is listed as a party will not (i) breach or  constitute
grounds for the occurrence or  declaration of a default under,  or allow another
party a right  to  terminate  any  agreement,  indenture,  undertaking  or other
instrument to which IRIS is a party or by which it or any of its  properties may
be bound or affected,  (ii) violate any provision of Law, the violation of which
could have a Material  Adverse  Effect or (iii)  violate  any  provision  of the
Articles of Incorporation or Bylaws of IRIS.

         3.4 SEC Filings.  IRIS has previously  furnished to Seller complete and
correct  copies  of the IRIS  Annual  Report  on Form  10-K  for the year  ended
December 31, 1995,  Proxy Statement dated April 29, 1996 and Quarterly Report on
Form 10-Q for the  quarter  ended March 31,  1996  (collectively,  the "IRIS SEC
Documents").  The IRIS SEC  Documents  comply in all material  respects with the
requirements of the Exchange Act and

                                      -14-



<PAGE>



none of the IRIS SEC Documents  contains any untrue statement of a material fact
or omits to state a material fact required to be stated  therein or necessary to
make the statements made therein,  in light of the  circumstances  in which they
were made,  not  misleading,  except to the extent  modified or  superseded by a
document  subsequently  filed with the SEC.  Since December 31, 1995 through the
date  hereof,  IRIS has not made any filings  with the  Securities  and Exchange
Commission other than (i) the IRIS SEC Documents,  (ii) a Current Report on Form
8-K  dated   February  16,  1996   (reporting   the   acquisition   of  StatSpin
Technologies),  (iii) a Registration  Statement on Form S-3 dated March 27, 1996
(relating to the resale of up to 466,311  shares of IRIS Common Stock by selling
securityholders  issued  or  issuable  in  connection  with the  acquisition  of
StatSpin  Technologies)  and (iv) a Current Report on Form 8-K dated May 9, 1996
(reporting the execution of the Letter of Intent).  The financial  statements of
IRIS, including the notes thereto, included in the IRIS SEC Documents (the "IRIS
Financial  Statements")  comply  as  to  form  in  all  material  respects  with
applicable accounting  requirements and with the published rules and regulations
of the SEC with respect  thereto,  have been  prepared in  accordance  with GAAP
(except as may be  indicated  in the notes  thereto or, in the case of unaudited
statements,  as  permitted  by  Form  10-Q  of  the  SEC),  fairly  present  the
consolidated  financial  position  of  IRIS  at  the  dates  thereof  and of its
operations  and cash flows for the periods then ended  (subject,  in the case of
unaudited statements,  to normal,  recurring audit adjustments) and are complete
and correct in all material  respects.  The IRIS  Financial  Statements  include
adequate  reserves  for  contracts,   commitments,   warranties  and  contingent
liabilities to the extent required by GAAP.

         3.5  Capitalization.  Except  for (i) items  disclosed  in the IRIS SEC
Documents,  (ii) the issuance of  additional  stock options under the IRIS stock
option plans and (iii) the continuing  right of employees to purchase  shares of
IRIS Common Stock under the IRIS Key Employee Stock Purchase Plan,  there are no
outstanding  options,  warrants,  convertible debt securities or other rights to
purchase any shares of capital stock of IRIS. Since March 31, 1996, IRIS has not
issued or sold any shares of capital stock or any options, warrants, convertible
debt  securities or other rights to purchase  shares of capital stock except for
(i) stock  options to purchase  44,200 shares of IRIS Common Stock granted under
the IRIS stock option plans and (ii) shares of IRIS Common Stock issued pursuant
to the exercise of outstanding  warrants described in the SEC Documents.  During
the period from March 31, 1996  through the date  hereof,  IRIS did not sell any
shares of IRIS Common Stock under the IRIS Key Employee Stock Purchase Plan.

         3.6 Contingencies. Except as disclosed in the IRIS SEC Documents, there
is no litigation,  arbitration, other proceedings, written audit requests or, to
the  knowledge  of  IRIS,  investigations  pending  against  IRIS  or any of its
officers or directors (in their  capacities  as such) which could  reasonably be
expected to have a Material Adverse Effect.  IRIS is not in default with respect
to any order,  writ,  injunction or decree of any court or other governmental or
regulatory authority.


                                      -15-



<PAGE>



          3.7 No Material Changes.  Since March 31, 1996, there has not been any
Material  Adverse Effect,  or any occurrence or event which could  reasonably be
expected to have a Material Adverse Effect.

         3.8  Compliance  with Laws. The business and operations of IRIS are and
have been in  compliance  with all Laws,  except  where the failure to so comply
could not reasonably be expected to have a Material Adverse Effect.

         3.9 IRIS  Securities.  The Senior  Subordinated  Note and IRIS Warrant,
when issued at the Closing, will be duly authorized and validly issued, and IRIS
has reserved for  issuance  upon the exercise of the IRIS Warrant the  requisite
number of shares of IRIS Common Stock.  The shares of IRIS Common Stock issuable
upon exercise of the IRIS Warrant, when issued in compliance therewith,  will be
duly and validly issued, fully paid and non-assessable.

          3.10 Purchasing Inventory for Resale. IRIS is purchasing the Inventory
for resale in the ordinary course of business.

         3.11  Commissions.  Neither  IRIS nor any of its  officers,  directors,
agents or employees has employed or incurred any liability to any broker, finder
or agent for any brokerage fees,  finder's fees,  commissions or similar amounts
with respect to the  Transactions,  and IRIS agrees to hold Seller harmless from
and against Losses incurred by reason of any contrary assertions.

         3.12 Accuracy of Information Furnished.  To the best knowledge of IRIS,
no statement or  information  contained in any  schedule,  certificate  or other
document or information furnished,  or to be furnished,  by or on behalf of IRIS
(i) contains or will contain any untrue  statement of a material  fact,  or (ii)
omits or will omit to state any  material  fact  necessary  in order to make the
statements  contained therein,  in light of the circumstances under which it was
made,  not  misleading,  except  where such untrue  statement  or  omission  was
corrected in subsequent  information  delivered or made available by IRIS or its
representatives to Seller or its representatives.


                                    SECTION 4

                               COVENANTS OF SELLER

          4.1 Conduct of Business Prior to Closing. Seller agrees that until the
Closing Date,  unless IRIS shall  otherwise  consent in writing in advance,  the
Operating Companies will:

                  4.1.1  Conduct business only in the ordinary and usual course
consistent with past practice;

                                      -16-



<PAGE>



                  4.1.2 Use  reasonable  efforts to preserve the  goodwill  with
their customers,  suppliers,  distributors and others having business  relations
with them;

                  4.1.3  Not transfer or encumber any of the Assets except for
the sale of Inventory in the ordinary course of business;

                  4.1.4 Maintain their books and records in accordance with past
practices and  policies,  except for such changes of which they will advise IRIS
as are required to comply with GAAP or applicable Law;

                  4.1.5  Preserve  their  business  organization  intact and use
reasonable  efforts to keep  available  to IRIS the  services  of their  present
employees;

                  4.1.6 Continue to maintain all of the Equipment, Inventory and
Personalty  in good  repair,  order  and  condition,  reasonable  wear  and tear
excepted;

                  4.1.7 Not enter  into or amend,  waive any  rights  under,  or
exercise any option to extend or renew, any Material Assigned Contract except in
the ordinary and usual course consistent with past practice;

                  4.1.8 Use  reasonable  efforts to  maintain  in full force and
effect all policies of insurance  with respect to the Business now in effect (or
secure  comparable  replacement  policies  in the event the  insurer  cancels or
declines  to renew such  policies)  and give all  notices and present all claims
under all such policies in a timely fashion;

                  4.1.9 Not (i) borrow or agree to borrow  any funds,  or incur,
assume or guarantee any obligation or liability (absolute or contingent),  which
is not incurred in the ordinary  course of business;  or (ii) pay,  discharge or
satisfy any Claim,  liability or obligation  (absolute,  accrued,  contingent or
otherwise),  other than the payment,  discharge or  satisfaction in the ordinary
course of business  consistent  with past practice of liabilities or obligations
reflected,  or reserved against,  in the Financial  Statements or incurred after
the  dates of the  Financial  Statements  in the  ordinary  course  of  business
consistent with past practice;

                  4.1.10  Not effect any transaction or enter into any contract
or  arrangement  between any Operating  Company,  on the one hand, and DITI, the
Controlling Stockholder or any Affiliate of the Controlling Stockholder,  on the
other hand, including, without limitation,  PSISI, Terra Laboratories,  Ltd. and
Terra Laboratories, Ltd. II;

                  4.1.11 Not advance any funds to,  guarantee  any  indebtedness
of, or incur or pay any expenses or  liabilities  to or on behalf of, DITI,  the
Controlling  Stockholder  or  any  Affiliate  of  the  Controlling  Stockholder,
including,  without  limitation,  PSISI,  Terra  Laboratories,  Ltd.  and  Terra
Laboratories,  Ltd. II, other than the payment of Corporate  Management Expenses
to DITI in the ordinary course consistent with past practice;

                                      -17-


<PAGE>



                  4.1.12  Pay any interest on, or repay any principal of, any 
indebtedness  to or on  behalf  of  DITI,  the  Controlling  Stockholder  or any
Affiliate of the Controlling Stockholder,  including, without limitation, PSISI,
Terra Laboratories, Ltd. and Terra Laboratories, Ltd. II; and

                  4.1.13 Not declare,  set aside or pay any  dividend,  make any
other  distribution  in  respect of their  stock or make any direct or  indirect
redemption, purchase or other acquisition of their stock (except as contemplated
by Section 6.12).

         4.2  Representations  True. Until the Closing Date, Seller will perform
such  reasonable  acts as may be  necessary  or  appropriate  to make all of its
representations  and  warranties set forth in this Agreement true and correct on
and as of the Closing Date. Seller will inform IRIS promptly upon discovery that
any of its representations or warranties ceases to be true or correct.

         4.3 Access.  From the date hereof through the earlier of the Closing or
termination  of this  Agreement,  Seller will (i) permit IRIS and its authorized
representatives  to have full  access  during  normal  business  hours and under
reasonable  conditions  to any  and  all  premises,  properties,  files,  books,
records,  documents and other  information of Seller,  (ii) provide IRIS and its
authorized  representatives  with all information which such parties  reasonably
request  concerning the Business,  including without  limitation,  the financial
condition  and  results of  operation  of  Seller,  (iii)  otherwise  reasonably
cooperate with and assist IRIS and its authorized  representatives in connection
with their  investigation,  (iv) upon the request of IRIS,  deliver to IRIS true
and  correct  copies of any  documents  requested,  and (v) permit  IRIS and its
auditors to confer with Seller's auditors,  Buffington & Company, P.C. regarding
their audits and reviews of the Financial Statements.

         4.4 Supplemental Information.  From the date hereof through the Closing
Date, Seller shall deliver to IRIS immediately upon Seller's discovery or access
thereto,  any  information  (i) as may be  reasonably  required  to  update  the
information  set forth on the Schedules  hereto or (ii) that  otherwise  amends,
updates or conflicts with any of the matters discussed in the representations or
warranties set forth in Section 2.

         4.5 Permits.  Seller will make all filings with governmental bodies and
other   regulatory   authorities  and  obtain  all  other  permits,   approvals,
authorizations  and  consents  of all  third  parties  necessary  for  Seller to
consummate the Transactions, including those listed on Schedule 2.2.

          4.6 Security  Interests.  On or before the Closing Date,  Seller shall
secure termination of any liens,  charges,  options,  adverse claims or security
interests in or to the Assets except the Obligations.


                                      -18-



<PAGE>



         4.7 Closing Agreements. Subject to the fulfillment by IRIS or waiver by
Seller of the conditions precedent contained in Section 7, Seller will, and will
cause  all  of its  Affiliates  which  are  listed  as  parties  to the  Closing
Agreements  to,  execute and deliver the Closing  Agreements  prior to or at the
Closing.

         4.8 Legal Opinion. Seller shall use its best efforts to cause Andrews &
Kurth LLP, counsel to Seller,  to render an opinion at the Closing,  dated as of
the Closing Date, in substantially the form attached hereto as Exhibit C.


                                    SECTION 5

                                COVENANTS OF IRIS

         5.1  Representations  True.  Until the Closing Date,  IRIS will perform
such  reasonable  acts as may be  necessary  or  appropriate  to make all of its
representations  and  warranties set forth in this Agreement true and correct on
and as of the Closing Date. IRIS will inform Seller promptly upon discovery that
any of its representations or warranties ceases to be true or correct.

         5.2 Supplemental Information.  From the date hereof through the Closing
Date,  IRIS shall  deliver to DITI  immediately  upon IRIS'  discovery or access
thereto,  any  information  that amends,  updates or  conflicts  with any of the
matters discussed in the representations or warranties set forth in Section 3.

         5.3 Permits.  IRIS will make all filings with  governmental  bodies and
other regulatory authorities and obtain all permits,  approvals,  authorizations
and  consents  of all  third  parties,  necessary  for  IRIS to  consummate  the
Transactions, including those listed on Schedule 3.2.

          5.4 Closing Agreements. Subject to the fulfillment by Seller or waiver
by IRIS of the  conditions  precedent  contained in Section 6, IRIS will execute
and deliver the Closing Agreements prior to or at the Closing.

         5.5 Legal Opinion.  IRIS shall use reasonable  efforts to cause Irell &
Manella LLP, counsel for IRIS, to render an opinion at the Closing,  dated as of
the Closing Date, in substantially the form attached hereto as Exhibit D.



                                      -19-



<PAGE>



                                    SECTION 6

                   CONDITIONS PRECEDENT TO OBLIGATIONS OF IRIS

         Subject to the proviso in clause (ii) of Section 9.1,  the  obligations
of IRIS to consummate  this  Agreement and the  Transactions  are subject to the
satisfaction,  prior  to or as of the  Closing  Date,  of each of the  following
conditions, each of which may be waived by IRIS in writing:

         6.1 Accuracy of Representations and Warranties. The representations and
warranties  of Seller  contained  in this  Agreement  or in any  certificate  or
document  delivered to IRIS pursuant  hereto shall be true and correct on and as
of the  Closing  Date as though made at and as of that date  (except  where such
representation  and  warranty  is  made  as of a  date  specifically  set  forth
therein), and Seller shall have delivered to IRIS a certificate to that effect.

         6.2  Compliance  with  Covenants.  Seller  shall  have in all  material
respects  performed  and  complied  with all terms,  agreements,  covenants  and
conditions  of this  Agreement to be  performed or complied  with by them at the
Closing  Date,  and Seller shall have  delivered to IRIS a  certificate  to that
effect.

         6.3 Consents Obtained; Filings. Seller shall have obtained all consents
and  approvals  from,  and shall have  completed all  declarations,  filings and
registrations  with,  government  agencies  and private  third  parties that are
required  for the  execution,  delivery  and  performance  of this  Agreement by
Seller.

          6.4 No  Material  Adverse  Effect.  There  shall have been no Material
Adverse Effect, or any occurrence or event which could reasonably be expected to
have a Material Adverse Effect.

         6.5 Legal Actions or Proceedings.  No legal action or proceeding  shall
have been instituted or overtly threatened by any governmental agency seeking to
restrain,  prohibit,  invalidate  or otherwise  affect the  consummation  of the
Transactions,  and no legal action or proceeding  shall have been  instituted or
overtly  threatened by any private party seeking  material  monetary awards from
IRIS in connection with the Transactions.

         6.6  All  Proceedings  to Be  Satisfactory.  All  corporate  and  other
proceedings to be taken by Seller in connection  with the  Transactions  and all
documents  incident  thereto  shall  be  reasonably  satisfactory  in  form  and
substance to IRIS and its counsel, and IRIS and said counsel shall have received
all such  certified  or other  copies  of such  documents  as it may  reasonably
request.


                                      -20-



<PAGE>



         6.7  Opinion of Counsel  for  Seller.  IRIS  shall  have  received  the
favorable opinion of Andrews & Kurth, counsel to Seller, dated the Closing Date,
in substantially the form attached as Exhibit C.

          6.8  Closing  Agreements.  The  Closing  Agreements  shall  have  been
executed and delivered by all parties thereto,  unless the failure to do so is a
result of a breach by IRIS.

         6.9 Transfer  Documents.  Seller shall have  executed and delivered the
Transfer  Documents and thereby have delivered to IRIS good and marketable title
to the Assets free and clear of any liens, charges,  options,  adverse claims or
security interests except the Obligations.

          6.10  Closing  Documents.  IRIS  shall  have  received,  in  form  and
substance  reasonably  satisfactory  to its  counsel,  each  and  every  closing
document required to be delivered to it as set forth in this Agreement.

          6.11 Commissions. Seller shall have paid all the commissions listed on
Schedule 2.26.

         6.12 Capital  Stock of PSI.  PSII shall have  acquired and delivered to
IRIS beneficial and record  ownership of all the  outstanding  shares of capital
stock of PSIL, and Mr. Landells shall have waived any and all rights he may have
to acquire stock of PSIL, including,  without limitation,  through any option or
right of first refusal.

         6.13  Pending  Lawsuit.  DITI shall have (i) paid all fees and expenses
owed to the law firm of  Singleton  & Cooksey  with  respect to the  Stockholder
Lawsuit,  (ii)  secured  from  Singleton  &  Cooksey a  written  release  of all
liability  for such fees and  expenses  for any  employees  to whom IRIS  offers
employment or (iii) agreed in writing to indemnify  such  employees  against any
liability for such fees and expenses.


                                    SECTION 7

                  CONDITIONS PRECEDENT TO OBLIGATIONS OF SELLER

         Subject to the proviso in clause (iii) of Section 9.1, the  obligations
of Seller to consummate this Agreement and the  Transactions  are subject to the
satisfaction,  prior to or at the Closing, of the following conditions,  each of
which may be waived by Seller in writing:

          7.1 Accuracy of Representations  and Warranties.  The  representations
and  warranties of IRIS  contained in this  Agreement or in any  certificate  or
document delivered to Seller pursuant hereto shall be true and correct on and as
of the Closing Date as though

                                      -21-



<PAGE>



made at and as of that date (except  where such  representation  and warranty is
made as of a date specifically set forth therein), and IRIS shall have delivered
to Seller a certificate to such effect.

         7.2 Compliance with Covenants. IRIS shall in all material respects have
performed and complied with all terms,  agreements,  covenants and conditions of
this  Agreement to be performed or complied with by it at the Closing Date,  and
IRIS shall have delivered to Seller a certificate to that effect.

         7.3 Consents Obtained;  Filings.  IRIS shall have obtained all consents
and  approvals  from,  and shall have  completed all  declarations,  filings and
registrations  with,  government  agencies  and private  third  parties that are
required for the execution, delivery and performance of this Agreement by IRIS.

         7.4 No  Material  Adverse  Effect.  There  shall have been no Material
Adverse Effect, and no occurrence or event which could reasonably be expected to
result in a Material Adverse Effect.

         7.5  All  Proceedings  to Be  Satisfactory.  All  corporate  and  other
proceedings  to be taken by IRIS in  connection  with the  Transactions  and all
documents  incident  thereto  shall  be  reasonably  satisfactory  in  form  and
substance  to Seller and its  counsel,  and Seller and said  counsel  shall have
received  all such  certified  or other  copies  of such  documents  as they may
reasonably request.

         7.6  Opinion of  Counsel  for IRIS.  Seller  shall  have  received  the
favorable opinion of Irell & Manella,  counsel for IRIS, dated the Closing Date,
substantially in the form attached as Exhibit D.

         7.7 Legal Actions or Proceedings.  No legal action or proceeding  shall
have been instituted or overtly threatened by any governmental agency seeking to
restrain,  prohibit,  invalidate  or otherwise  affect the  consummation  of the
Transactions,  and no legal action or proceeding  shall have been  instituted or
overtly  threatened by any private party seeking  material  monetary awards from
Seller in connection with the Transactions.

          7.8  Closing  Agreements.  The  Closing  Agreements  shall  have  been
executed and delivered by all parties thereto,  unless the failure to do so is a
result of a breach by Seller or a refusal by any of its Affiliates.

          7.9  Closing  Documents.  Seller  shall  have  received,  in form  and
substance  reasonably  satisfactory  to its  counsel,  each  and  every  closing
document required to be delivered to it as set forth in this Agreement.

          7.10 Purchase  Price.  Seller shall have  received,  as of the Closing
Date, the Purchase Price in the manner set forth in Section 1.4.

                                      -22-



<PAGE>

                                    SECTION 8

                                 INDEMNIFICATION

         8.1 Right of  Indemnification.  Subject to Section 8.4, IRIS and Seller
each agree to indemnify and hold the other (and the other's respective officers,
directors,  employees  and agents)  harmless from and against the full amount of
all Losses  arising  out of or  resulting  from a breach of any  representation,
warranty or covenant made by the Indemnifying Party in this Agreement.

         8.2 Deductible Amount.  Notwithstanding the foregoing, neither IRIS, on
the one hand, nor Seller,  on the other hand, shall be required to indemnify the
other under the terms of this Agreement unless and until the aggregate amount of
the Losses of the other  exceeds  $50,000,  in which  case such  indemnification
obligations shall apply to all Losses in excess of such threshold. The foregoing
threshold  shall not apply against IRIS for failure to make  payments  under the
Senior Subordinated Note.

         8.3   Survival  of   Representations;   Effect  of   Disclosures.   The
representations  and warranties in this Agreement  shall survive the Closing and
remain  in full  force  and  effect  regardless  of any  disclosures  made to or
investigations made by a party.

         8.4 Time Limit.  Notwithstanding  Section 8.3,  neither  party may seek
indemnity  under  this  Section 8 or any other  recovery  or remedy for any Loss
under this  Agreement  at any time after two (2) years  from the  Closing  Date;
provided,  however,  that IRIS may seek  indemnification  hereunder for any Loss
based on (i) any  obligations,  debts,  contracts and  liabilities not expressly
assumed by IRIS (including,  without limitation,  as a result of a breach of the
representations and warranties concerning the obligations,  debts, contracts and
liabilities  of PSIL)  until 30 days  after  the  expiration  of the  applicable
statute of limitations for the relevant obligation,  debt, contract or liability
or (ii) any  covenant  contained in Section 10 (Other  Covenants)  until two (2)
years from the date the covenant is breached.

         8.5  Procedures  for  Indemnification.  If any claim is asserted or any
action or proceeding is brought in respect of which indemnity may be sought, the
Indemnified Party will promptly notify the Indemnifying Party in writing of such
asserted  claim or the  institution  of such  action  or  proceeding;  provided,
however,  that the  Indemnified  Party's  failure to so notify the  Indemnifying
Party  will not  relieve  the  Indemnifying  Party from any  liability  it might
otherwise  have on account  of this  indemnity,  except to the  extent  that the
Indemnifying Party has been materially  prejudiced by such failure to notify. If
requested  by  the  Indemnified  Party  in  the   aforementioned   notice,   the
Indemnifying  Party shall undertake full  responsibility  for the defense of any
Third-Party  Claim  which,  if  successful,  would  result in an  obligation  of
indemnity under this Agreement. The Indemnifying Party may contest or settle any
such claim on such terms as the

                                      -23-



<PAGE>



Indemnifying  Party may choose,  provided that the  Indemnifying  Party will not
have the right, without the Indemnified Party's prior written consent, to settle
any such claim if such  settlement  (i) arises  from or is part of any  criminal
action,  suit or  proceeding,  (ii)  contains a  stipulation  to,  confession of
judgement with respect to, or admission or acknowledgement  of, any liability or
wrongdoing  on the  part of the  Indemnified  Party,  (iii)  relates  to any tax
matters,  (iv) provides for injunctive  relief, or other relief or finding other
than money damages,  which is binding on the Indemnified  Party, or (v) does not
contain an unconditional  release of the Indemnified Party. Such defense will be
conducted  by  reputable  attorneys  retained by the  Indemnifying  Party at the
Indemnifying  Party's cost and expense,  but the Indemnified Party will have the
right to participate  in such  proceedings  and to be separately  represented by
attorneys of its own choosing. The Indemnified Party will be responsible for the
costs of such separate  representation  unless the  Indemnified  Party will have
reasonably  concluded  that  the  interests  of the  Indemnified  Party  and the
Indemnifying Party in the action conflict in such a manner and to such an extent
as to make  advisable,  consistent  with  applicable  standards of  professional
responsibility,  the retention of separate counsel for the Indemnified Party, in
which  case the  Indemnifying  Party  will pay for one (but not more  than  one)
separate counsel chosen by the Indemnified Party.

         8.6 Cooperation. The Indemnifying Party and the Indemnified Party shall
cooperate in determining the validity of any Third-Party  Claim for any Loss for
which a claim of  indemnification  may be made hereunder.  Each party shall also
use all reasonable efforts to minimize all Losses.


                                    SECTION 9

                                   TERMINATION

         9.1 Grounds for Termination. Subject to Section 9.3, this Agreement may
be terminated:  (i) at any time prior to the Closing by either IRIS or Seller if
there has been a breach of the  representations,  warranties or covenants of the
other party set forth  herein  which is  reasonably  expected to have a Material
Adverse Effect, but only if such breach remains uncured for a period of ten (10)
days after receipt of written notice of such breach from the nonbreaching party;
(ii) by IRIS if any  condition  stated  in  Section 6 cannot be or have not been
satisfied by the Closing Date,  provided,  however,  IRIS may not terminate this
Agreement   pursuant   to  this  clause  "ii"  if  IRIS  would  be  entitled  to
indemnification  under this Agreement for the failure to satisfy such condition,
money  damages  would  adequately  compensate  IRIS  for  any  Losses  resulting
therefrom and the Losses could not  reasonably be expected to exceed of $50,000;
(iii) by Seller if any condition  stated in Section 7 cannot be or have not been
satisfied by the Closing Date, provided,  however, Seller may not terminate this
Agreement  pursuant  to this  clause  "iii"  if  Seller  would  be  entitled  to
indemnification  under this Agreement for the failure to satisfy such condition,
money  damages  would  adequately  compensate  Seller for any  Losses  resulting
therefrom

                                      -24-



<PAGE>



and the Losses could not  reasonably  be expected to exceed of $50,000;  (iv) by
mutual  agreement  of Seller and IRIS;  or (v) by Seller or IRIS if the  Closing
shall not have occurred within forty-five (45) days of the date hereof, provided
that the right to terminate  this  Agreement  pursuant to this Section 9.1 shall
not be available  to a party who has  materially  breached  any  representation,
warranty or covenant of this Agreement.

         9.2 Effect of Termination.  If this Agreement is terminated as provided
in Section 9.1, all obligations of the parties  hereunder will terminate without
liability of any party to any other party,  except (i) that the  obligations set
forth in Sections  2.26 and 3.11  (Commissions),  10.1  (Confidentiality),  12.2
(Expenses),  12.9 (Governing Law; Consent to  Jurisdiction),  12.10  (Attorneys'
Fees) and 12.13  (Arbitration)  will survive any such  termination  and (ii) for
liability  for Losses  caused by any prior  breach  (which shall not include the
mere failure of any condition precedent).

         9.3 Rights to Proceed. If any of the conditions  specified in Section 6
have  not  been  satisfied,  IRIS  will  have  the  right  to  proceed  with the
Transactions  without  waiving any of its rights  hereunder  to seek damages for
Losses related to any breach of a representation,  warranty or covenant;  and if
any of the  conditions  specified in Section 7 have not been  satisfied,  Seller
will have the right to proceed with the Transactions  without waiving any of its
rights  hereunder  to  seek  damages  for  Losses  related  to any  breach  of a
representation,  warranty or covenant.  Either party may elect by written notice
to postpone  the Closing  Date,  but not by more than  fifteen  (15) days,  if a
condition to closing has not been met either because of circumstances beyond its
reasonable control or an unintentional  breach of a representation,  warranty or
covenant by it and such  condition is reasonably  expected to be met or cured on
or before the new Closing Date.

         9.4  Specific  Performance.  The  Assets to be  transferred  under this
Agreement  are uniquely  suited for the  purposes  and needs of IRIS.  If Seller
should  default  in its  obligations  under this  Agreement,  the  parties  each
acknowledge  that the  remedy at law would be  inadequate  to  compensate  IRIS.
Accordingly, IRIS, in addition to any other available rights or remedies, may at
its sole option sue in equity for  specific  performance,  and Seller  expressly
waives the defense that a remedy in damages will be adequate.


                                   SECTION 10

                                 OTHER COVENANTS

         10.1  Confidentiality.  Each party hereto shall  strictly  maintain the
confidential  nature  of,  and not  disclose  to any third  party or use for any
purpose other than in  connection  with the  Transactions  without prior written
consent, (a) any confidential  information learned about the other in the course
of the  Transactions  or (b) the exact terms of this  Agreement,  or the Closing
Agreements  or any other  documents  signed at the  Closing,  unless  and to the
extent necessary to carry out the Transactions, provided that

                                      -25-



<PAGE>



Seller will not make any public  announcements  regarding the Transactions prior
to  Closing,  and  IRIS  will  consult  with  Seller  in  preparing  any  public
announcement, including affording Seller an opportunity to review in advance any
press releases  regarding the Transactions.  Each party shall be responsible for
any breach of this Section 10.1 by its officers,  employees, agents or advisors.
Upon termination of this Agreement pursuant to Section 9.1, Seller and IRIS each
agree to return or destroy any and all  materials  containing  any  confidential
information.  These restrictions on use and obligations of confidentiality  will
not apply to any  information  (i) to the extent the receiving party is required
to disclose such  information by law or applicable  regulation or under court or
governmental  order,  (ii) then in the public domain by acts not attributable to
such party,  (iii) hereafter  received by the receiving party from a third party
source on an unrestricted  basis, (iv) known to the receiving party prior to the
date  of  disclosure   hereunder  except  to  the  extent  subject  to  a  prior
confidentiality  agreement,  or (v) necessary to enforce this Agreement provided
that all reasonable  steps are taken to limit the amount of  disclosure.  If the
Closing occurs,  IRIS shall be released from any obligations  under this Section
10.1 with regard to the Business or Assets. Seller shall not disclose or use any
confidential  information  about the Business or Assets  before or after Closing
without  the prior  written  consent  of IRIS  except (i) if this  Agreement  is
terminated  pursuant to Section 9.1, (ii) before Closing in the ordinary  course
of  business  or (iii) as provided  in clauses  (i),  (ii),  (iii) or (v) of the
fourth sentence of this Section 10.1.

         10.2 Employment of Certain Personnel.  As far in advance of the Closing
as is  practicable,  IRIS shall provide Seller with a list of employees who will
be offered employment following the Closing (which shall constitute at least 75%
of the employees of the Operating Companies as of the date hereof) on an at-will
basis,  subject to  termination  by IRIS or each  employee  for any reason or no
reason at any time,  and Seller shall use  reasonable  efforts to assist IRIS in
hiring and retaining the employees of Seller on that basis. Any and all costs of
severance of Seller's  employees  not hired or retained by IRIS shall be for the
account of Seller,  and IRIS shall not be deemed to have  assumed  any  benefits
obligations  of Seller to its  employees.  In accordance  with Internal  Revenue
Service  Procedure 84-77,  IRIS will include on the Wage and Tax Statement (Form
W-2) issued to each  continuing  employee for the year ending December 31, 1996,
all wages paid to, and taxes withheld from,  such employee by Seller during such
period.  Furthermore,  Seller shall  transfer to IRIS promptly after the Closing
the Employee  Withholding  Allowance  Certificate (Form W-4) for each continuing
employee.

         10.3 Change of Names.  Promptly  following the Closing,  DITI, PSII and
PSTI shall amend their Articles of  Incorporation to change their names to names
which in the reasonable opinion of IRIS are not confusingly  similar to the name
"Perceptive  Scientific" or any of the  Trademarks,  and thereafter none of them
shall have any further  rights to use such name or any of the  Trademarks.  DITI
shall  cause  PSISI to take  comparable  actions  and cease using such names and
Trademarks within 180 days of the Closing Date.


                                      -26-


<PAGE>



         10.4 Collection of Accounts  Receivable.  Seller  covenants that in the
event it receives any payments with regard to any Asset,  including the Accounts
Receivable,  after  the  Closing,  it  will  promptly  pay the  amount  actually
collected directly to IRIS.

         10.5 Notification of Suppliers and Distributors.  After the Closing, if
requested  by IRIS,  Seller  shall  promptly  notify  all of its  suppliers  and
distributors that the Business has been transferred to IRIS.

         10.6  Non-Competition.  For a period of five (5) years from the Closing
Date,  DITI and each  Operating  Company  agree that they will not,  directly or
indirectly, engage in, own, manage, operate, join, control or participate in the
ownership,   management,  operation  or  control  of  any  business  engaged  in
developing,  manufacturing and/or marketing digital image processing or analysis
products or  services  in any city or county in the United  States of America or
any comparable subdivision of any foreign country; provided,  however, that DITI
may own, manage and operate a business engaged in the Well Log Business.  Seller
hereby  represents  and  warrants  to IRIS that Seller is  currently  engaged in
substantial activities related to the Business worldwide. The foregoing covenant
is a material part of the consideration for the purchase of the Assets,  and the
Purchase Price includes  consideration for such covenant.  Furthermore,  without
limiting the  foregoing,  neither DITI,  PSISI nor any  Operating  Company shall
directly or indirectly,  without the prior written consent of IRIS, (i) hire any
employee  or  consultant  of IRIS for a period of two (2) years from the Closing
Date,  (ii)  induce or take any  action  intended  to  induce  any  employee  or
consultant of IRIS to cease providing or otherwise  alter the services  provided
to IRIS for a period of five (5) years from the Closing  Date or (iii) induce or
attempt to induce any customer of IRIS or any present  customer of PSII, PSTI or
any of their  subsidiaries  to cease doing  business with IRIS or to do business
with any of its then  competitors or potential  competitors for a period of five
(5) years from the Closing Date.

         10.7  Nominee to IRIS Board of  Directors.  Promptly  after the Closing
Date,  IRIS  shall  appoint  the  Controlling  Stockholder  to the IRIS Board of
Directors  as a Class 1 Director to serve  until the next annual  meeting of the
IRIS  stockholders.  During  his  tenure  on the IRIS  Board of  Directors,  the
Controlling  Stockholder  shall be  entitled  to cash  compensation,  reasonable
expenses  and  indemnification  to the same  extent  as any  other  non-employee
director.  The  Controlling  Stockholder  may also invite one (1) advisor of his
choosing,  subject to the reasonable  approval of IRIS, to attend the IRIS Board
meetings.  DITI shall be responsible  for all  compensation  and expenses of the
Controlling Stockholder's advisor attending IRIS Board meetings. If, at the time
of the next annual meeting of the IRIS stockholders, (i) the Senior Subordinated
Note remains outstanding or (ii) DITI continues to beneficially own at least 50%
of the Warrant Shares (including,  for this purpose, any Warrant Shares issuable
upon  exercise of the  unexercised  portion of IRIS Warrant then owned by DITI),
the  Controlling  Stockholder  shall have the right to  nominate  a  replacement
nominee for DITI,  subject to approval of the other members of the IRIS Board of
Directors based on their past practice of qualifying nominees, and IRIS

                                      -27-



<PAGE>



shall use reasonable efforts to effect such nominee's election to the IRIS Board
of  Directors  at  such  annual  meeting.  In  addition  to  cash  compensation,
reasonable expenses and  indemnification,  the replacement nominee shall also be
entitled to stock  option  awards  under the IRIS stock option plans to the same
extent  as any  other  non-employee  director.  If,  at  any  time,  the  Senior
Subordinated  Note has been repaid in full and DITI no longer  beneficially owns
at least 50% of the Warrant  Shares  (including,  for this purpose,  any Warrant
Shares  issuable upon exercise of the  unexercised  portion of IRIS Warrant then
owned by DITI), then, upon the request of IRIS, DITI shall cause the Controlling
Stockholder or his replacement  nominee,  as applicable,  to voluntarily  resign
from the IRIS Board of Directors.  DITI acknowledges and agrees that, until IRIS
has the right to request the  resignation of DITI's nominee to the IRIS Board of
Directors,  IRIS  will  consider  DITI  and the  Controlling  Stockholder  to be
"affiliates"  of IRIS  as  defined  in  Rule  144  promulgated  pursuant  to the
Securities Act.

         10.8     Cooperation by Seller.

                  10.8.1 Consulting  Services.  For a period of 90 (ninety) days
from the Closing  Date,  Seller shall from time to time consult with IRIS during
normal business hours to the extent reasonably requested by IRIS for the purpose
of transferring the operation of the Business from Seller to IRIS. Such services
may include,  without  limitation,  (i)  advising  IRIS with respect to Seller's
procedures   for   manufacturing   digital   imaging   processing  and  analysis
instruments,  (ii)  introducing  IRIS to the suppliers and  distributors for the
Business,  (iii)  responding  to questions  about the Business or the Assets and
(iv) providing accounting,  insurance,  administrative,  information systems and
such other services as IRIS may reasonably request.  IRIS shall reimburse Seller
at its cost for providing such  services.  Seller  acknowledges  and agrees that
title and full ownership rights to any modifications,  changes, derivative works
and enhancements  made to the  Intellectual  Property by Seller in the course of
providing such consulting services under this Agreement shall vest in and remain
the sole property of IRIS.

                  10.8.2 Additional Acts. Each party hereto agrees,  both before
and after the Closing, to execute any and all further documents and writings and
perform  such  other  reasonable  actions  which may be or become  necessary  or
expedient to effectuate and carry out the Transactions  (which shall not include
any obligation to make  payments).  Moreover,  if following the Closing,  either
party shall  discover any  Material  Assigned  Contract  which was not listed on
Schedule  2.19,  at the  request  and  option  of IRIS,  Seller  shall  take all
reasonable  steps  necessary to assign such  contract to IRIS except that Seller
shall  not be  required  to pay  money or  other  valuable  consideration.  Such
assignment shall not relieve Seller of responsibility  for Losses of IRIS caused
by the failure to make the transfer on the Closing Date.

                  10.8.3  Confirmation  of Title. At and following the Closing,
Seller shall  promptly from time to time execute and deliver any  assignments or
other assurances or

                                      -28-



<PAGE>



reports which IRIS shall reasonably advise Seller are necessary to vest, perfect
or confirm title to any Asset in IRIS.

                  10.8.4   Announcements.   Seller  will  not  make  any  public
announcements regarding the Transactions prior to Closing, and IRIS will consult
with Seller in preparing any public announcement,  including affording Seller an
opportunity to review in advance any press releases regarding the Transactions.

         10.9  Cooperation  by Buyer.  For a period of 90 (ninety) days from the
Closing Date, Buyer shall cooperate with Seller as reasonably  requested for the
purposes of facilitating the separation of the Business from Seller's  remaining
businesses and operations.  Such cooperation  shall consist of reasonable access
to the Files and office Equipment and  consultations  with IRIS employees during
normal business hours.


                                   SECTION 11

                                  DEFINITIONS

         The following terms shall have the meanings set forth below:

         "Accounts  Receivable"  shall  mean all  payments,  rights to  payment,
accounts  receivable,  revenues or other sums payable to PSII or PSTI (and those
of DITI which relate to the Business).

         "Affiliate" shall mean any person which, directly or indirectly through
one or more intermediaries,  controls, is controlled by, or is in common control
with, a specified person.

         "Assets" shall mean all of the real and personal property, tangible and
intangible,  of every kind, nature and description,  and wherever located, owned
or leased by PSII or PSTI (and those owned or leased by DITI which relate to the
Business),  including,  without limitation,  the Accounts  Receivable,  Assigned
Contracts, Equipment, Files, Intellectual Property, Inventory,  Personalty, PSIL
Stock, Purchase Commitments,  Sales Commitments and the goodwill associated with
the  Business,   except  the  Retained   Assets.   For  purposes  of  Section  2
(Representations and Warranties of Seller),  Section 4 (Covenants of Seller) and
Section 6 (Conditions  Precedent to Obligations of IRIS),  the term Assets shall
also be deemed to include the Assets of PSIL.

         "Assigned  Contracts"  shall mean all agreements,  written and oral, to
which DITI, PSII or PSTI is a party and which relate to the Business, including,
without limitation, the Employee Patent and Confidentiality Agreements and those
agreements set forth on Schedule 2.19, other than Existing Employment Contracts,
Purchase Commitments,  Sales Commitments and agreements relating to indebtedness
for borrowed money.

                                      -29-



<PAGE>



          "Audited  Financial  Statements"  shall have the  meaning set forth in
Section 2.6.

         "Business" shall mean the business of developing,  manufacturing and/or
marketing   digital  image   processing  and  analysis   products  and  services
(including,  without limitation,  the proprietary  PowerGene(TM) product line of
genetic analysis  instruments) as presently conducted,  as conducted in the past
12  months  and  as  contemplated  to be  conducted  in  the  Private  Placement
Memorandum,  by DITI and the Operating Companies;  provided,  however,  that the
Business shall not include the Well Log Business.

          "Closing"  and  "Closing  Date" shall have the  meanings  set forth in
Section 1.2

         "Closing  Agreements"  shall mean (i) the License  Agreement,  (ii) the
Termination and Release Agreements, (iii) the Senior Subordinated Note, (iv) the
IRIS  Warrant,  (v)  the  Registration  Rights/Standstill  Agreement,  (vi)  the
Stockholder Guaranty, (vii) the Stockholder  Noncompetition Agreement and (viii)
the New Employment Contracts.

         "Code" shall mean the Internal Revenue Code of 1986, as amended.

         "Controlling  Stockholder" shall mean Edward Randall III, an individual
and the majority stockholder of DITI.

         "Copyrights" shall mean all U.S. and foreign copyrights, whether or not
registered, together with any pending applications for the registration thereof,
owned by or licensed to DITI, PSII or PSTI, including, without limitation, those
listed on Schedule 2.10.

         "Corporate Management Expenses" shall have the meaning set forth in
Section 1.4.1.

         "Customer  Lists" shall mean all lists of, and information  concerning,
the end users of the Products,  wherever  located and  regardless of the form in
which stored.

          "DITI"  shall mean  Digital  Imaging  Technologies,  Inc.,  a Delaware
corporation.

         "Effective Date" shall have the meaning set forth in Section 1.2.

         "Equipment" shall mean all equipment,  tools, machinery, molds, tooling
and similar tangible assets owned by PSII or PSTI (and those owned by DITI which
are used in the  Business),  wherever  located and whether in the  possession of
DITI, any Operating Company or others.

         "Employee Patent and Confidentiality Agreements" shall mean any and all
agreements  executed by any present or former  employee or  consultant  of DITI,
PSII or PSTI or any of their respective  predecessors for the purpose,  in whole
or in part, of

                                      -30-



<PAGE>



protecting  rights to, or the  confidentiality  of,  proprietary  technology  or
information.  In the event that such  agreements are contained in a more general
employment   or   consulting   agreement,   the  term   "Employee   Patent   and
Confidentiality  Agreement"  shall mean only the  provisions  of such  agreement
relating to the protection of rights to, or the  confidentiality of, proprietary
information or technology.

         "Environmental Law" shall have the meaning set forth in Section 2.18.

         "ERISA" shall mean the Employee Retirement Income Security Act of 1974,
as amended.

          "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
amended.

         "Existing Employment Contracts" shall have the meaning set forth in
Section 2.24.

         "FDA" shall mean the U.S. Food & Drug Administration.

         "Files"  shall mean all files,  documents,  papers and other records of
PSII or PSTI (and those of DITI  which  pertain  to the  Business  or any of the
Assets),  wherever  located,  whether in the  possession of DITI,  any Operating
Company or others and regardless of the form in which they are stored.

         "Financial   Statements"  shall  mean  (i)  the  audited   consolidated
financial  statements  of DITI for the years ended  December  31, 1995 and 1994,
together  with the related notes and  schedules  and the  independent  auditor's
report thereon, (ii) the unaudited consolidated financial statements of DITI for
the three-month  period ended March 31, 1996,  (iii) the unaudited  consolidated
financial statements of PSII for the twelve-month period ended December 31, 1995
and  (iv)  the  unaudited  consolidated  financial  statements  of PSII  for the
three-month period ended March 31, 1996.

         "GAAP" shall mean generally accepted accounting principles applied on a
consistent basis.

         "Hazardous   Materials"  shall  mean  (i)  any  substance   defined  as
"hazardous"  under any  Environmental  Law,  including,  but not limited to, the
Comprehensive  Environmental  Response,  Compensation  and Liability Act of 1980
("CERCLA");  (ii) any  substance  or matter  which  results in  liability to any
person or entity from discharge of or exposure to such substance or matter under
any  statutory,  regulatory or common law theory;  (iii) any substance or matter
which  becomes  subject to a federal,  state,  local or foreign  agency order or
requirement  for  removal,  treatment  or  remediation;  (iv)  crude  oil or any
fraction  thereof,  and (v) any material  defined as "hazardous"  under Texas or
United Kingdom law.


                                      -31-



<PAGE>



         "Indemnified  Party"  shall mean,  with  respect to any Loss or alleged
Loss, the party seeking indemnity hereunder.

         "Indemnifying  Party"  shall mean,  with respect to any Loss or alleged
Loss, the party from whom indemnity is being sought hereunder.

         "Intellectual Property" shall mean the Software, Patents, Copyrights,
Trademarks, Customer Lists and other Proprietary Information.

         "Inventory"  shall mean all tangible  goods held for future sale in the
Business,  including,  without  limitation,  raw materials and work in progress,
wherever located and whether in the possession of DITI, any Operating Company or
others.

          "IRIS"  shall mean  International  Remote  Imaging  Systems,  Inc.,  a
Delaware corporation.

         "IRIS Common Stock" shall mean shares of common  stock,  $.01 par value
per share, of IRIS.

         "IRIS  Warrant"  shall mean a  warrant,  in  substantially  the form of
Exhibit B attached hereto, to purchase 875,000 shares of IRIS common stock at an
exercise  price of $8.00  per  share  from the  Closing  Date  until  the  Fifth
Anniversary of the Closing Date.

         "Key  Employees"  shall mean the  following  employees of the Operating
Companies:  (i) Mr. Tony  Landells,  President of PSIL,  (ii) Dr. Ken Castleman,
Vice  President of Research of PSII,  (iii) Mr. Don Winkler,  Vice  President of
Business Development of PSII, (iv) Mr. Paul Douglas,  Vice President of Sales of
PSIL, (v) Mr. Dindy Ramkisson,  North American Sales Manager of PSII, (vi) Steve
Clarner,  Senior  Software  Engineer for PSII, and (vii) Steve Rosser,  Software
Engineer for PSII.

         "Knowledge" shall mean (i) in the case of Seller,  the actual knowledge
of the Controlling  Stockholder or any director or senior officer of DITI or any
Operating  Company and (ii) in the case of IRIS,  any director or senior officer
of IRIS.  "Best  knowledge"  shall mean the  "knowledge"  of such persons  after
reasonable  inquiry to the extent prudent under the  circumstances,  and "senior
officer" shall mean any officer with a title at least equal to vice president.

         "Law"  shall  mean  all  foreign,   federal,   state  and  local  laws,
ordinances,  regulations,  judgments,  orders,  decrees  or rules of any  court,
arbitrator or governmental, regulatory or administrative agency or entity.

         "Letter of Intent"  shall mean that  certain  letter  dated May 3, 1996
from IRIS to DITI confirming the parties' mutual intention that IRIS acquire the
Business.


                                      -32-



<PAGE>



         "License  Agreement"  shall mean a license  agreement  between IRIS and
PSISI,  dated as of the Closing  Date,  in  substantially  the form of Exhibit F
attached hereto.

         "Loss"  shall mean any and all costs and expenses  (including,  without
limitation,  reasonable attorneys' fees and expenses and court costs incident to
any suit, action,  investigation or other proceedings),  damages and losses, net
of any insurance proceeds received with respect thereto.

         "Material   Adverse   Effect"  shall  mean  (i)  with  respect  to  any
representation or warranty made by Seller or any condition to the obligations of
IRIS,  a  material  adverse  effect  on  the  Transactions,   the  Assets,   the
Obligations,  the  Business  or the  prospects  for the  Business  and (ii) with
respect to any  representation  or warranty made by IRIS or any condition to the
obligations of Seller,  a material  adverse effect on the Transactions or on the
business or financial  condition of IRIS and its subsidiaries  taken as a whole.
For purposes of this definition,  the terms Assets and Obligations shall include
the Assets and Obligations of PSIL.

          "Material  Assigned  Contracts"  shall have the  meaning  set forth in
Section 2.19.

          "Net Cash  Transfers  to DITI"  shall  have the  meaning  set forth in
Section 1.4.1.

         "New Employment  Contracts"  shall mean written  employment  agreements
satisfactory  in form and  substance to IRIS,  effective as of the Closing Date,
between IRIS and each of the Key  Employees  for a term of not less than two (2)
years.

         "Obligations"  shall mean the obligations of PSII and/or PSTI under (i)
the Assigned Contracts,  (ii) the Payables,  (iii) the Purchase  Commitments and
(iv) the Sales  Commitments.  Without  expanding the foregoing  definition,  the
Obligations  shall not  include  (i)  liabilities  or  expenses  relating to the
negotiation or performance of this  Agreement  (including,  without  limitation,
commissions,  legal  fees,  employee  bonuses  and the cost of  reacquiring  the
minority  interest in PSIL) which shall be incurred  and paid solely by DITI and
not by any of the Operating Companies, (ii) liabilities associated with property
or assets not  transferred  or  delivered  to IRIS as part of the Assets,  (iii)
accrued  vacation,  (iv)  federal  or  state  income  or  franchise  taxes,  (v)
liabilities  to, or  incurred  on behalf  of,  PSISI,  (vi)  liabilities  to, or
incurred  on behalf of, the  Controlling  Stockholder  or any of his  Affiliates
(including, without limitation, Terra Laboratories,  Ltd. or Terra Laboratories,
Ltd. II), (vii)  liabilities or expenses  relating to the  Stockholder  Lawsuit,
including,  without  limitation,  legal fees and expenses payable to the firm of
Singleton & Cooksey,  (viii) any  liabilities or obligations  for borrowed money
(except PSIL's line of credit with National  Westminster Bank which shall remain
in effect under which there shall be no amounts outstanding on the Closing Date)
or (ix) any  liabilities  or  obligations  to DITI.  For  purposes  of Section 2
(Representations and Warranties of Seller),  Section 4 (Covenants of Seller) and
Section 6 (Conditions  Precedent to Obligations of IRIS),  the term  Obligations
shall also be deemed to include the Obligations of PSIL.

                                      -33-



<PAGE>



         "Operating Companies" shall mean PSII, PSTI and PSIL.

         "Patents" shall mean all U.S. and foreign patents and pending  patents,
together with any enhancements or improvements thereto,  owned by or licensed to
DITI,  PSII or PSTI,  including,  without  limitation,  those listed on Schedule
2.10.

         "Payables" shall mean all of the outstanding  accounts payable to trade
creditors,  accrued payroll,  accrued and withheld payroll taxes and accrued and
withheld sales taxes reflected on PSII's consolidated  balance sheet dated as of
December  31, 1995 or incurred  subsequent  to the date  thereof in the ordinary
course of the Business  consistent with past practice and reflected on books and
records of PSII or PSTI on the Closing Date.

         "Personalty" shall mean all tangible personal property owned by PSII or
PSTI  (and any  owned  by DITI  which is used in the  Business)  except  (i) the
Inventory,  (ii) the Equipment and (iii) any tangible  personal  included in the
Retained Assets.

         "Private Placement Memorandum" shall mean DITI's Private Placement
Memorandum dated December 1995.

         "Products" shall have the meaning set forth in Section 2.15.

         "Proprietary  Information" shall mean all trade secrets, data, methods,
test results, procedures, processes, techniques, systems, inventions, apparatus,
information,  manufacturing  and  engineering  drawings and prints,  artwork for
circuit boards, artwork for labels,  regulatory and manufacturing  documentation
and design specifications,  know-how and other proprietary  information owned by
or licensed to DITI, PSII or PSTI.

         "PSII" shall mean Perceptive Scientific  Instruments,  Inc., a Delaware
corporation and wholly-owned subsidiary of DITI.

         "PSII Cash" shall have the meaning set forth in Section 1.4.1.

          "PSII  Year-to-Date  EBIT" shall have the meaning set forth in Section
1.4.1.

         "PSIL" shall mean Perceptive Scientific  International,  Ltd., a United
Kingdom corporation and majority-owned subsidiary of PSII.

         "PSIL Stock" shall mean all the outstanding capital stock of PSIL.

         "PSISI"  shall mean  Perceptive  Scientific  Imaging  Systems,  Inc., a
Delaware corporation and wholly-owned subsidiary of DITI.

         "PSTI" shall mean Perceptive Scientific Technologies,  Inc., a Delaware
corporation and wholly-owned subsidiary of DITI.

                                      -34-



<PAGE>



         "Purchase Price" shall have the meaning set forth in Section 1.4.1.

         "Purchase  Commitments" shall mean the outstanding  obligations of PSII
and PSTI to purchase  Equipment or Inventory  after the Closing Date incurred in
the ordinary course of the Business consistent with past practice.

         "Registration  Rights/Standstill  Agreement"  shall mean a Registration
Rights/Standstill Agreement between IRIS and DITI, dated as of the Closing Date,
in substantially the form of Exhibit G attached hereto.

         "Retained  Assets"  shall  mean (i) the PSII Cash and the cash and cash
equivalents of DITI, (ii) the capital stock of PSII,  PSTI and PSISI,  (iii) the
Personalty listed on Schedule 0, (iv) the accounts  receivable by DITI which are
not related to the Business, (v) all notes and other accounts receivable by DITI
or any of the Operating Companies from the Controlling Stockholder or any of his
Affiliates,  (vi) any  refunds  due to  Seller  for tax  liabilities  previously
overpaid by DITI or any of the  Operating  Companies and (vii) all equipment and
furniture used exclusively by PSISI.

         "Sales  Commitments" shall mean the outstanding  obligations of PSII or
PSTI to sell  Inventory  or provide  related  services  after the  Closing  Date
incurred in the ordinary course of the Business consistent with past practice.

         "Securities Act" shall mean the Securities Act of 1933, as amended.

         "Seller" shall mean DITI, PSII and PSTI.

         "Senior  Subordinated Note" shall mean a $7,000,000  principal amount 8
1/2%  Senior  Subordinated  Note due  2001,  dated as of the  Closing  Date,  in
substantially the form of Exhibit A attached hereto.

         "Software"  shall  mean  all  software  products  (including,   without
limitation,  both  source  code and object  code)  owned by DITI,  PSII or PSTI,
including all enhancements, versions, releases and updates of such products, and
any  other  software  products  in  development   regardless  of  its  stage  of
development.

         "Stockholder Guaranty" shall mean a Guaranty Agreement between IRIS and
the  Controlling  Stockholder  in  substantially  the form of Exhibit L attached
hereto.

         "Stockholder  Lawsuit"  shall mean the  lawsuit  referred to in Note 12
(Prior Contingency) to the Financial  Statements for the year ended December 31,
1995 relating to the purchase of certain assets.


                                      -35-



<PAGE>



         "Stockholder  Noncompetition  Agreement"  shall  mean a  Noncompetition
Agreement between IRIS and the Controlling Stockholder in substantially the form
of Exhibit M attached hereto.

         "Tax or Taxes" shall mean any and all federal,  state,  local,  foreign
and other net income,  gross income,  gross  receipts,  sales,  use, ad valorem,
transfer, franchise, profits, license, lease, service, service use, withholding,
payroll,  employment,  excise, severance, stamp, occupation,  premium, property,
windfall profits,  customs,  duties or other taxes, fees, assessments or charges
of any kind whatever, together with any interest and any penalties, additions to
tax or additional amounts with respect thereto.

         "Termination and Release  Agreements"  shall mean  terminations of loan
agreements and/or releases of security interests in the Assets,  dated as of the
Closing Date, in substantially  the form of Exhibit E attached hereto,  from all
third  parties   whose  release  is  required  for  Seller  to  consummate   the
Transactions  and deliver good and marketable title to the Assets free and clear
of any liens, charges,  options, adverse claims or security interests except the
Obligations.

         "Third-Party  Claim"  shall mean a claim  brought by a third  party for
which indemnification is sought pursuant to this Agreement.

         "Trademarks"  shall mean all U.S. and foreign  trade names  (including,
but not  limited  to,  the  trade  names  "Perceptive  Scientific  Instruments",
"Perceptive Scientific  Technologies",  "Perceptive  Scientific  International",
"Perceptive  Scientific Microscopy" and "Perceptive Scientific Imaging Systems")
trademarks and service marks (together with any pending  applications for any of
the foregoing)  owned by or licensed to DITI, PSII or PSTI,  including,  without
limitation, those listed on Schedule 2.10.

         "Transactions"  shall  mean  the  transactions  contemplated  by  this
Agreement.

         "Transfer Documents" shall mean (i) the Bill of Sale attached hereto as
Exhibit H, (ii) the Assumption Agreement attached hereto as Exhibit I, (iii) the
Patent  Assignment  attached hereto as Exhibit J, (iv) the Trademark  Assignment
attached hereto as Exhibit K and (v) such other documents as IRIS may reasonably
request for the purpose of transferring ownership of the Assets to IRIS.

         "Warrant  Shares"  shall mean the shares of IRIS Common Stock  issuable
upon exercise of the IRIS Warrant.

         "Well  Log   Business"   shall  mean  the   business   of   developing,
manufacturing,  marketing  and selling  digital  image  processing  and analysis
products and services for use solely in the oil and gas industry.



                                      -36-


<PAGE>



                                   SECTION 12

                                  MISCELLANEOUS

         12.1 Entire Agreement;  Modifications. This Agreement and any documents
referred  to  herein  or  executed  contemporaneously  herewith  constitute  the
parties'  entire  agreement  with  respect  to the  subject  matter  hereof  and
supersede all agreements, representations,  warranties, statements, promises and
understandings,  whether  oral or written,  with  respect to the subject  matter
hereof; provided, however, that the paragraphs of the Letter of Intent which are
expressly  designated  as binding  shall  remain in full force and effect.  This
Agreement may not be amended,  altered or modified except by a writing signed by
the parties.

         12.2  Expenses.  Except as set forth in Section 1.6 (Sales and Use Tax)
or 12.10  (Attorneys'  Fees),  whether or not the  Transactions are consummated,
none of the parties  hereto shall have any obligation to pay any of the fees and
expenses  of any  other  party  incident  to the  negotiation,  preparation  and
execution of this  Agreement or any related  agreements,  including the fees and
expenses of counsel, accountants, investment bankers and other experts.

         12.3  Waivers.  Seller may by written  notice to IRIS,  or IRIS may, by
written notice to the Seller,  (a) extend the time for the performance of any of
the obligations or other actions of the other parties under this Agreement;  (b)
waive any inaccuracies in the representations or warranties of the other parties
contained  in this  Agreement  or in any  document  delivered  pursuant  to this
Agreement;  (c) waive  compliance with any of the conditions or covenants of the
other parties  contained in this Agreement;  or (d) waive  performance of any of
the  obligations of the other parties under this  Agreement.  With regard to any
power,  remedy or right  provided  herein or  otherwise  available  to any party
hereunder, (i) no waiver or extension of time will be effective unless expressly
contained in a writing  signed by the waiving party or its  representative,  and
(ii) no alteration,  modification or impairment will be implied by reason of any
previous  waiver,  extension  of time,  delay or  omission  in exercise or other
indulgence.

         12.4 Cooperation.  Each party hereto agrees,  both before and after the
Closing  Date,  to execute any and all further  documents  and  writings  and to
perform  such other  actions  which may be or become  necessary  or expedient to
effectuate and carry out this Agreement.

          12.5  Third-Party  Benefits.  None of the provisions of this Agreement
will be for the benefit of, or enforceable by, any third-party beneficiary.

          12.6 Successors and Assigns. This Agreement shall inure to the benefit
of and be binding upon the parties  hereto and their  respective  successors and
permitted  assigns.  At any time prior to the Closing Date,  IRIS may assign its
rights and obligations

                                      -37-


<PAGE>



hereunder to a wholly-owned  subsidiary of IRIS;  however,  such assignment will
not release IRIS from any obligations hereunder to Seller. Except for such right
of IRIS,  none of the parties may assign any of its rights under this  Agreement
without the prior written consent of the others.

         12.7 Remedies Not Exclusive.  Subject to Section 12.13  (Arbitration of
Disputes),  no  remedy  conferred  by any of the  specific  provisions  of  this
Agreement is intended to be exclusive  of any other  remedy,  and each and every
remedy will be  cumulative  and will be in addition to every other  remedy given
hereunder  or now or  hereafter  existing  at law or in equity or by  statute or
otherwise. The election of any one or more remedies will not constitute a waiver
of the right to pursue other available remedies.

         12.8 Notices.  All notices under this  Agreement will be in writing and
will be  delivered by personal  service or  facsimile or certified  mail (or, if
certified mail is not available,  then by first class mail), postage prepaid, to
such address as may be designated from time to time by the relevant  party,  and
which will  initially be as set forth below.  Any notice sent by certified  mail
will be deemed to have been  given  three (3) days after the date on which it is
mailed.  All other notices will be deemed given when received.  No objection may
be made to the manner of delivery of any notice actually  received in writing by
an authorized agent of a party.  Notices will be addressed as follows or to such
other address as the party to whom the same is directed  will have  specified in
conformity with the foregoing:

                  (a)      If to IRIS:

                               International Remote Imaging Systems, Inc.
                               9162 Eton Avenue
                               Chatsworth, California 91311
                               Attn:     Fred H. Deindoerfer
                                         Chairman of the Board and President
                               Telephone:       (818) 709-1244
                               Facsimile:       (818) 700-9661

                           With a copy to:

                               Irell & Manella LLP
                               1800 Avenue of the Stars, Suite 900
                               Los Angeles, California 90067
                               Attn:     Theodore E. Guth, Esq.
                               Telephone:       (310) 277-1010
                               Facsimile:       (310) 203-7199


                                      -38-



<PAGE>



                  (b)      If to Seller

                                    Digital Imaging Technologies, Inc.
                                    2950 North West Loop, Suite #1050
                                    Houston, Texas 77092
                                    Attn:     James L. Hurn
                                              Chief Executive Officer
                                    Telephone:       (713) 956-2165
                                    Facsimile:       (713) 956-2185

                           With a copy to:

                                    Andrews & Kurth LLP
                                    Texas Commerce Tower
                                    600 Travis, Suite 4200
                                    Houston, Texas  77002
                                    Attn:     Robert V. Jewell, Esq.
                                    Telephone:       (713) 220-4200
                                    Facsimile:       (713) 220-4285

         12.9 Governing Law;  Consent to  Jurisdiction.  This Agreement shall be
governed by, and  construed  and enforced in  accordance  with,  the laws of the
State of Delaware  without  regard to the conflict of laws rules of the State of
Delaware or any other  jurisdiction  that would call for the  application of the
laws of any  jurisdiction  other than the State of  Delaware.  Each party hereto
hereby irrevocably consents, for itself and its legal representatives, partners,
successors and assigns, to the exclusive jurisdiction of the Courts of the State
of Delaware for all purposes in connection  with any action or  proceeding  that
arises from or relates to this  Agreement,  and further agrees that,  subject to
Section 12.13 (Arbitration of Disputes),  any action arising from or relating to
this  Agreement  shall be instituted  and  prosecuted  only in the courts of the
State of Delaware,  and hereby waives any rights it may have to personal service
of summons, complaint, or other process in connection therewith, and agrees that
service may be made by registered or certified mail to such party at the address
set forth in Section 12.8 (Notices).

         12.10  Attorneys'  Fees.   Should  any  litigation  or  arbitration  be
commenced  (including any proceedings in a bankruptcy court) between the parties
hereto or their  representatives  concerning  any provision of this Agreement or
the rights and  duties of any person or entity  hereunder,  the party or parties
prevailing  in such  proceeding  shall be  entitled,  in  addition to such other
relief as may be  granted,  to the  reasonable  attorneys'  fees and court costs
incurred by reason of such litigation or arbitration.

         12.11  Headings.  The Section  headings in this  Agreement are inserted
only as a matter  of  convenience,  and in no way  define,  limit,  or extend or
interpret the scope of this Agreement or of any particular Section.

                                      -39-



<PAGE>



         12.12  Severability.  The validity,  legality or  enforceability of the
remainder  of this  Agreement  shall not be affected  even if one or more of the
provisions  of  this  Agreement  shall  be  held  to  be  invalid,   illegal  or
unenforceable  in any respect.  To the extent  permitted by applicable  law, the
parties hereby waive any provision of law that would render any provision hereof
prohibited or unenforceable in any respect.  Further, if the period of time, the
extent of the geographic area, or the scope of the proscribed activities covered
by Section 10.6 (Non-Competition)  should be deemed unenforceable,  then Section
10.6 shall be construed to cover the maximum period of time, geographic area and
scope of proscribed  activities (not to exceed the maximum time, geographic area
or scope set forth herein) as may be valid under applicable law.

         12.13  Arbitration of Disputes.  Except for actions seeking  injunctive
relief,  which may be brought  before any court having  jurisdiction,  any claim
arising out of or relating to (i) this Agreement, including, but not limited to,
its validity, interpretation, enforceability or breach, or (ii) the relationship
between the parties  (including its commencement and termination)  which are not
settled by  agreement  between  the  parties,  shall be  settled by  arbitration
conducted   exclusively  in  Wilmington,   Delaware  before  a  board  of  three
arbitrators,  one  selected by each  party,  and the third by the two persons so
selected,  all in  accordance  with  the  Commercial  Arbitration  Rules  of the
American Arbitration Association ("AAA") then in effect. The notice of intent to
arbitrate  shall name one  arbitrator,  and the party(ies)  receiving the notice
shall name the second  arbitrator  within 15 days or the moving party may select
the second  arbitrator  from a list supplied by the AAA. In the event that these
two arbitrators  cannot agree upon a third  arbitrator  within 15 days, then the
third  arbitrator  shall be selected  from the list provided by the AAA with the
parties  striking  names in order with the party striking first to be determined
by  the  flip  of a  coin.  The  parties  hereby  consent  to  the  in  personam
jurisdiction  of the courts of the State of Delaware for purposes of  confirming
any such award and entering  judgment  thereon.  In any arbitration  proceedings
hereunder,  (a) all  testimony  of  witnesses  shall be taken  under  oath;  (b)
discovery  will be allowed to the same extent as available  under the rules then
applicable  to civil  actions  under  Delaware  law; (c) upon  conclusion of any
arbitration,  the  arbitrators  shall render findings of fact and conclusions of
law in a written  opinion  setting  forth the basis and reasons for any decision
reached and deliver such documents to each party to this Agreement  along with a
signed copy of the award;  and (d) the rules of evidence as then  applicable  to
civil actions under Delaware law shall be applied in the arbitration. Each party
agrees that the  arbitration  provisions  of this  Agreement  are its  exclusive
damage remedy and expressly  waives any right to seek redress in another  forum.
Each party shall bear the fees of the  arbitrator  appointed by it, and the fees
of the  neutral  arbitrators  shall be borne  equally by each  party  during the
arbitration, but the fees of all arbitrators shall be borne by the losing party.

          12.14 Agreement  Negotiated.  The parties hereto are sophisticated and
have consulted legal counsel with respect to this transaction. As a consequence,
the parties do not believe that the  presumptions of any statutory or common law
rule relating to the

                                      -40-



<PAGE>



interpretation  of contracts against the drafter of any particular clause should
be applied in this case and therefore waive its effects.

         12.15  Counterparts.  This  Agreement  may be  executed  in two or more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.


                      *** [NEXT PAGE IS SIGNATURE PAGE] ***

                                      -41-



<PAGE>



                   Signature Page to Asset Purchase Agreement

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed, as of the day and year first above written.


"IRIS"

INTERNATIONAL REMOTE IMAGING
SYSTEMS, INC., a Delaware corporation



By:

Name:

Title:


"DITI"

DIGITAL IMAGING TECHNOLOGIES, INC.,
a Delaware corporation



By:

Name:

Title:



                                       S-1



<PAGE>



"PSII"

PERCEPTIVE SCIENTIFIC INSTRUMENTS,
INC., a Delaware corporation



By:

Name:

Title:


"PSTI"

PERCEPTIVE SCIENTIFIC TECHNOLOGIES,
INC., a Delaware corporation



By:

Name:

Title:




     The  undersigned  hereby  represents  and  warrants to IRIS that (i) he has
consented to the  Transactions in his capacity as the sole  stockholder of DITI,
(ii) he will not revoke such consent and (iii),  subject to the  satisfaction or
waiver by Seller of the conditions  precedent to the  obligations of Seller,  he
will  execute and deliver to IRIS on or before the Closing  Date all the Closing
Agreements to which he is listed as a party.


"CONTROLLING STOCKHOLDER"




Edward Randall III


                                       S-2
                                    



                                                                EXHIBIT B

                                   AGREEMENT

         This AGREEMENT ( this  "Agreement")  is entered into as of July 2, 1996
by  and  among  DIGITAL  IMAGING  TECHNOLOGIES,  INC.,  a  Delaware  corporation
("DITI"),  PERCEPTIVE  SCIENTIFIC  INSTRUMENTS,  INC.,  a  Delaware  corporation
("PSI"),   PERCEPTIVE  SCIENTIFIC   INTERNATIONAL   LIMITED,  a  United  Kingdom
corporation  ("PSIL"),  Edward  Randall  III  ("Randall"),  Anthony G.  Landells
("Landells") and Marjorie Landells ("Mrs. Landells").

                                   WITNESSETH:

         WHEREAS,  PSI and Landells  have  previously  entered into that certain
Terms of Agreement  dated  October 1, 1992  regarding  the creation of PSIL (the
"Terms of Agreement"); and

         WHEREAS,  pursuant  to the Terms of  Agreement,  Landells  was  granted
certain  rights with  respect to equity  ownership  in PSIL and PSI, any sale or
other  disposition  of PSIL or its assets,  any sale of PSI, and  management  of
PSIL; and

         WHEREAS,  PSI,  PSIL and  Landells  have  previously  entered into that
certain Subscription Agreement dated February 1, 1994 regarding equity ownership
in  PSIL  and  certain  related  rights  and  obligations   (the   "Subscription
Agreement"); and

         WHEREAS,  pursuant to the Subscription Agreement,  Landells was granted
certain rights with respect to the sale or other  disposition of assets of PSIL;
and

         WHEREAS,  pursuant to the Articles of Association of PSIL dated January
30, 1994 (the  "Articles  of  Association"),  Landells  and Mrs.  Landells  have
certain  rights with respect to the transfer or other  disposition  of shares of
PSIL; and

         WHEREAS,  Randall owns 100% of the  outstanding  capital stock of DITI;
DITI  owns 100% of the  outstanding  capital  stock of PSI;  PSI owns 75% of the
outstanding  ordinary  shares and 100% of the outstanding  preference  shares of
PSIL;  Landells owns 13.5% of the outstanding  ordinary shares of PSIL; and Mrs.
Landells owns 11.5% of the outstanding ordinary shares of PSIL; and

         WHEREAS,  DITI  desires to effect a sale (the  "Sale") of the assets of
PSI and the assets or shares of PSIL to  International  Remote Imaging  Systems,
Inc.,  a  Delaware  corporation  ("IRIS"),  pursuant  to  one or  more  purchase
agreements  between DITI, PSI, PSIL and certain of their affiliates,  on the one
hand, and IRIS on the other hand (the " Purchase Agreement"); and

         WHEREAS,  Landells  desires to transfer his shares in PSIL and to waive
his rights under the Terms of  Agreement,  the  Subscription  Agreement  and the
Articles of  Association  in exchange  for certain  consideration,  as described
herein; and

         WHEREAS,  Mrs.  Landells  desires to transfer her shares in PSIL and to
waive her rights  under the  Articles of  Association  in  exchange  for certain
consideration, as described herein.

         NOW,  THEREFORE,  in  consideration  of the premises and other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the parties hereto agree as follows:

          1. Transfer of Shares.  (a) Subject to the  performance by DITI of its
obligations  under  paragraph 5(a) hereof,  Landells  hereby sells,  assigns and
transfers 135 "A" ordinary  shares of PSIL,  represented by  Certificate  No. 7,
which constitute all of the shares of PSIL owned by him, to PSI, free

                                       -1-

<PAGE>



from all claims, charges, liens, encumbrances, equities or adverse rights of any
description,  and irrevocably appoints and constitutes James L. Hurn attorney to
transfer the shares on the books of PSIL with full power of  substitution in the
matter; and

                  (b)  Subject  to the  performance  by DITI of its  obligations
under paragraph 5(b) hereof,  Mrs. Landells hereby sells,  assigns and transfers
115"A"  ordinary  shares  of PSIL,  represented  by  Certificate  No.  6,  which
constitute all of the shares of PSIL owned by her, to PSI, free from all claims,
charges, liens, encumbrances, equities or adverse rights of any description, and
irrevocably  appoints  and  constitutes  James L. Hurn  attorney to transfer the
shares on the books of PSIL with full power of substitution in the matter.

         2.  Waiver of Rights.  (a)  Subject to the  performance  by DITI of its
obligations under paragraphs 5(c) and 6 hereof,  Landells hereby irrevocably and
forever  waives  any and all  rights  he has or may  have  under  the  Terms  of
Agreement and the Subscription  Agreement,  including without limitation any and
all rights relating to equity ownership in PSIL or PSI, voting rights, rights of
first refusal relating to the sale,  transfer or other  disposition of assets or
shares of PSIL,  co-exit rights  regarding the sale of PSI, and any rights under
common law or statute he has or may have relating to the foregoing; and

                  (b)  Subject  to the  performance  by DITI of its  obligations
under paragraphs 5(a) and 5(b) hereof, respectively,  Landells and Mrs. Landells
hereby  irrevocably  and  forever  waive any and all rights he or she has or may
have under the Articles of Association, including without limitation any and all
voting  rights and rights of first  refusal  relating  to the sale,  transfer or
other  disposition of shares of PSIL, and any rights under common law or statute
he or she has or may have relating to the foregoing.

          3. Consent to Sale of Business. (a) Subject to the performance by DITI
of its  obligations  under  paragraphs  5(c) and 6 hereof,  in his capacity as a
party to the Terms of Agreement and the Subscription Agreement,  Landells hereby
consents  to the  Sale  to IRIS  (or its  permitted  assignee)  pursuant  to the
Purchase Agreement; and

                  (b)  Subject  to the  performance  by DITI of its  obligations
under  paragraphs  5(a) and 5(b) hereof,  respectively,  in their  capacities as
shareholders in PSIL,  Landells and Mrs.  Landells hereby consent to the Sale to
IRIS (or its permitted assignee) pursuant to the Purchase Agreement.

         4. Release. Subject to the performance by DITI of its obligations under
paragraphs 5(a) and 5(b) hereof, respectively, Landells and Mrs. Landells hereby
release DITI, PSI, PSIL and their respective  affiliates from any claim Landells
or Mrs.  Landells  has or may have  against any of them  relating to the Sale to
IRIS (or its permitted assignee);  provided that such release shall not preclude
any such claims against IRIS or any of its subsidiaries.

          5. Cash  Payments.  (a) In  consideration  of and subject to Landells'
performance under paragraphs 1(a), 2(b), 3(b) and 4 above, DITI agrees to pay to
Landells cash in the amount of US $46,980.

                  (b)  In  consideration  of  and  subject  to  Mrs.   Landells'
performance under paragraphs 1(b), 2(b), 3(b) and 4 above, DITI agrees to pay to
Mrs. Landells cash in the amount of US $40,020.

                  (c) In consideration  of and subject to Landells'  performance
under paragraphs 2(a) and 3(a) above, DITI agrees to pay to Landells cash in the
amount of US $296,960.


                                       -2-

<PAGE>



                  (d) The amounts to be paid by DITI  pursuant to  subparagraphs
(a) and (c) of this  paragraph  5 shall be paid  within 24 hours  following  the
consummation  of the  Sale to  IRIS  by wire  transfer  to  Landells'  and  Mrs.
Landells'  bank account in the name of A. G.  Landells & M. Landells with Lloyds
Bank plc Northwich Branch of 36 High Street, Northwich, Cheshire CW9 5BQ England
Account Number 01279738 Sort Code 30-90-16.

                  (e) The amount to be paid by DITI pursuant to subparagraph (b)
of this paragraph 5 shall be paid within 24 hours following the  consummation of
the Sale to IRIS by wire transfer to Mrs.  Landells' Building Society Account in
the name of Mrs.  Marjorie  Landells  with Halifax  Building  Society  Northwich
Branch at 61/63  Witton  Street,  Northwich,  Cheshire  CW9 5DW England  Account
Number 00260508 Sort Code 11-05-70.

                  (f) In the event any amounts  payable  under this  paragraph 5
are not received in full within 24 hours following the  consummation of the Sale
to IRIS, neither Landells nor Mrs. Landells shall be obligated to complete their
respective  obligations  under this Agreement until such amounts are received in
full and DITI shall pay  interest to Landells  and Mrs.  Landells at the rate of
10% per annum on such amounts  until paid in full,  such  interest to be payable
after as well as before  any  judgement  or ruling and to accrue on a day to day
basis.

         6. Assignment of Warrant.  In  consideration  of Landells'  performance
under  paragraphs 2(a) and 3(a) above,  DITI agrees to assign to Landells,  free
from all claims, charges, liens, encumbrances, equities or adverse rights of any
description,  warrants  to  purchase  21,960  shares of IRIS  common  stock (the
"Warrants").  The  Warrants  shall  be  represented  by  a  warrant  certificate
substantially  in the form of Exhibit B to the Purchase  Agreement (the "Warrant
Certificate"). The assignment shall be substantially in the form attached to the
Warrant  Certificate and shall be dated and issued to Landells as of the date of
the  consummation  of the  Sale to IRIS and  delivered  to  Landells  as soon as
reasonably  practicable  (but  in any  event  within  48  hours)  following  the
consummation  of the Sale to IRIS;  provided,  that the  Warrants  may be issued
directly to Landells by IRIS at the closing of the Sale pursuant to the Purchase
Agreement.

          7.  Consent to Transfer of Shares.  Landells  and Mrs.  Landells  each
consent to the  transfer of the shares by the other as  described in paragraph 1
above  and waive any and all  rights he or she has or may have with  respect  to
such shares.

         8.  Guaranty  and  Indemnity.  In  consideration  of and subject to the
performance by Landells and Mrs.  Landells under paragraphs 1, 2, 3 and 4 above,
Randall,   as   guarantor   and  primary   obligor,   hereby   irrevocably   and
unconditionally, as a continuing security to cover all liabilities due from time
to  time by DITI to  Landells  and  Mrs.  Landells  under  this  Agreement,  (i)
guarantees the payment to Landells and Mrs.  Landells of the cash payments to be
made  pursuant  to  paragraph  5 above and the  assignment  to  Landells  of the
Warrants  pursuant to paragraph 6 above,  and (ii) as a separate and independent
obligation  and  liability  from  his  obligations  and  liabilities  under  the
preceding clause (i), agrees to indemnify  Landells and Mrs. Landells in full on
demand against all losses,  costs and expenses  suffered or incurred by Landells
or Mrs.  Landells  arising from or in connection with any default by DITI and/or
Randall in fulfilling their respective obligations hereunder.

         9. Termination. The performance of the obligations of the parties under
this Agreement is expressly made subject to the consummation of the Sale to IRIS
(or its permitted assignee) pursuant to the Purchase Agreement. In the event the
Sale to IRIS (or its permitted  assignee)  pursuant to the Purchase Agreement is
not consummated, this Agreement shall automatically terminate and shall be of no
force or effect.

                                       -3-

<PAGE>



         10.      Miscellaneous.

                  (a)  Complete  Agreement.  This  Agreement  and any  documents
         executed  contemporaneously  herewith  constitute  the parties'  entire
         agreement  with respect to the subject  matter hereof and supersede all
         agreements,  representations,   warranties,  statements,  promises  and
         understandings,  whether  oral or written,  with respect to the subject
         matter hereof, including without limitation the Terms of Agreement, the
         Subscription Agreement and the Articles of Association.  This Agreement
         may not be amended,  altered or modified  except by a writing signed by
         the parties.

                    (b)  Assignment.  This  Agreement  shall be binding upon and
          inure to the  benefit  of the  parties  hereto  and  their  respective
          successors and permitted assigns.

                  (c)  Cooperation.  Each party hereto agrees to execute any and
         all further  documents  and writings and to perform such other  actions
         which may be or become  necessary or expedient or effectuate  and carry
         out the purposes and intent of this Agreement.

                  (d)  Severability.  In case any one or more of the  provisions
         contained  in  this  Agreement  shall,  for any  reason,  be held to be
         invalid,  illegal or  unenforceable  in any respect,  such  invalidity,
         illegality or unenforceability shall not affect any other provisions of
         this  Agreement,  and  this  Agreement  shall be  construed  as if such
         invalid,  illegal or  unenforceable  provision had never been contained
         herein.

                  (e) Governing  Law. This  Agreement  shall be governed by, and
         construed  and enforced in  accordance  with,  the laws of the State of
         Texas  without  regard to the  conflict  of laws  rules of the State of
         Texas or any other  jurisdiction that would call for the application of
         the laws of any jurisdiction other than the State of Texas.

                  (f)  Arbitration  of  Disputes.  Except  for  actions  seeking
         injunctive  relief,  which  may be  brought  before  any  court  having
         jurisdiction,  any  claim  arising  out  of or  relating  to  (i)  this
         Agreement, including, but not limited to, its validity, interpretation,
         enforceability or breach, or (ii) the relationship  between the parties
         (including its commencement  and termination)  which are not settled by
         agreement  between the parties,  shall be settled by  arbitration to be
         held in Houston,  Texas in accordance with the rules and regulations of
         the   American   Arbitration   Association.   Each  party  agrees  that
         arbitration  is its exclusive  damage  remedy and expressly  waives any
         right to seek redress in another form.

                  (g)  Headings.  The paragraph  headings in this  Agreement are
         inserted only as a matter of convenience,  and in no way define, limit,
         or extend or interpret the scope of this Agreement or of any particular
         paragraph.

                    (h)  Counterparts.   This   Agreement  may  be  executed  in
          counterparts,  each of which shall be deemed an  original,  but all of
          which together shall constitute one and the same instrument.
                         
         


                                       -4-

<PAGE>



                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be duly executed as of the date and year first written above.

                                     DIGITAL IMAGING TECHNOLOGIES, INC.,
                                     a Delaware corporation


                       By:
                      Name:
                     Title:

                                     PERCEPTIVE SCIENTIFIC INSTRUMENTS, INC.,
                                     a Delaware corporation


                       By:
                      Name:
                     Title:

                                     PERCEPTIVE SCIENTIFIC INTERNATIONAL
                                     LIMITED, a United Kingdom corporation

                       By:
                      Name:
                     Title:




                                                     Edward Randall III



                                                     Anthony G. Landells



                                                     Marjorie Landells


                                       -5-




                                                                  
                                                                  EXHIBIT C

                           Agreement for Joint Filing


                  In  connection  with the  beneficial  ownership  of  shares of
common stock, par value $.01 per share, of International Remote Imaging Systems,
Inc., Edward Randall III and Digital Imaging Technologies,  Inc. hereby agree to
the joint filing on behalf of such persons all filings,  including the filing of
a Schedule  13D and all  amendments  thereto  pursuant to Rule  13d-2(f)(1)(iii)
under the  Securities  Exchange Act of 1934,  as amended (the  "Exchange  Act"),
required  under the Exchange Act pursuant to which joint filing  statements  are
permitted.

                  IN WITNESS WHEREOF, the undersigned have caused this Agreement
for Joint Filing to be signed as of this 7th day of July, 1996.


                             DIGITAL IMAGING TECHNOLOGIES, INC.


                             By:      /s/ James L. Hurn
                             Name: James L. Hurn
                             Title:  Chief Executive Officer



                             EDWARD RANDALL, III


                             Signature:   /s/ Edward Randall, III
                             Name:    Edward Randall, III





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