BARRINGER LABORATORIES INC
SC 13D, 1996-05-23
TESTING LABORATORIES
Previous: TRANSCEND SERVICES INC, DEFS14A, 1996-05-23
Next: NATIONS INSTITUTIONAL RESERVES, DEF 14A, 1996-05-23




<PAGE>
 
<PAGE>




                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934


                          Barringer Laboratories, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                     Common Stock, Par Value $.01 Per Share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    068508100
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                            William R. Collins, Esq.
                              Howard, Darby & Levin
                           1330 Avenue of the Americas
                            New York, New York 10019
                                 (212) 841-1000
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                  May 15, 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  13D,  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 1 of 9 Pages
                           Exhibit Index is on Page 8




<PAGE>
 
<PAGE>

<TABLE>
<S>                                                  <C>                        <C>
- ------------------------------                                                  -------------------------
CUSIP No. 068508100                                  13D                        Page 2 of 9 Pages
- ------------------------------                                                  -------------------------
</TABLE>

<TABLE>
<S>  <C>             <C>    <C>                                                                    <C>

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

     John P. Holmes, III
- ---- ----------------------------------------------------------------------------------------------------
2    Check the Appropriate Box if a Member of a Group (See Instructions)                          (a) [ ]
                                                                                                  (b) [x]
- ---- ----------------------------------------------------------------------------------------------------
3    SEC Use Only

- ---- ----------------------------------------------------------------------------------------------------
4    Sources of Funds (See Instructions)

     PF
- ---- ----------------------------------------------------------------------------------------------------
5    Check Box if Disclosure of Legal Proceedings is Required Pursuant
     to Item 2(d) or 2(e)                                                                             [ ]
- ---- ----------------------------------------------------------------------------------------------------
6    Citizenship or Place of Organization

     United States of America
- ------------------- ------- -----------------------------------------------------------------------------
 Number of Shares     7     Sole Voting Power

                            126,435
                    ------- -----------------------------------------------------------------------------
   Beneficially       8     Shared Voting Power
     Owned by
                            0
                    ------- -----------------------------------------------------------------------------
       Each           9     Sole Dispositive Power
    Reporting
                            126,435
                    ------- -----------------------------------------------------------------------------
   Person With        10    Shared Dispositive Power

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

     126,435
- ---- ----------------------------------------------------------------------------------------------------
12   Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                                                    [X]
- ---- ----------------------------------------------------------------------------------------------------
13   Percent of Class Represented by Amount in Row (11)

     7.7%
- ---- ----------------------------------------------------------------------------------------------------
14   Type of Reporting Person (See Instructions)

     IN
- ---- ----------------------------------------------------------------------------------------------------

</TABLE>


<PAGE>
 
<PAGE>

<TABLE>
<S>                                                  <C>                        <C>
- ------------------------------                                                  -------------------------
CUSIP No. 068508100                                  13D                        Page 3 of 9 Pages
- ------------------------------                                                  -------------------------
</TABLE>

<TABLE>
<S>  <C>             <C>    <C>                                                                    <C>

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

     J. Francis Lavelle
- ---- ----------------------------------------------------------------------------------------------------
2    Check the Appropriate Box if a Member of a Group (See Instructions)                          (a) [ ]
                                                                                                  (b) [x]
- ---- ----------------------------------------------------------------------------------------------------
3    SEC Use Only

- ---- ----------------------------------------------------------------------------------------------------
4    Sources of Funds (See Instructions)

     PF
- ---- ----------------------------------------------------------------------------------------------------
5    Check Box if Disclosure of Legal Proceedings is Required Pursuant
     to Item 2(d) or 2(e)                                                                             [ ]
- ---- ----------------------------------------------------------------------------------------------------
6    Citizenship or Place of Organization

     United States of America
- ------------------- ------- -----------------------------------------------------------------------------
 Number of Shares     7     Sole Voting Power

                            126,435
                    ------- -----------------------------------------------------------------------------
   Beneficially       8     Shared Voting Power
     Owned by
                            0
                    ------- -----------------------------------------------------------------------------
       Each           9     Sole Dispositive Power
    Reporting
                            126,435
                    ------- -----------------------------------------------------------------------------
   Person With        10    Shared Dispositive Power

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

     126,435
- ---- ----------------------------------------------------------------------------------------------------
12   Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                                                    [x]
- ---- ----------------------------------------------------------------------------------------------------
13   Percent of Class Represented by Amount in Row (11)

     7.7%
- ---- ----------------------------------------------------------------------------------------------------
14   Type of Reporting Person (See Instructions)

     IN
- ---- ----------------------------------------------------------------------------------------------------

</TABLE>


<PAGE>
 
<PAGE>


<TABLE>
<S>                                                  <C>                        <C>
- ------------------------------                                                  -------------------------
CUSIP No. 068508100                                  13D                        Page 4 of 9 Pages
- ------------------------------                                                  -------------------------

</TABLE>

<TABLE>
<S>  <C>             <C>    <C>                                                                    <C>

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

     Thomas A. Dippel
- ---- ----------------------------------------------------------------------------------------------------
2    Check the Appropriate Box if a Member of a Group (See Instructions)                          (a) [ ]
                                                                                                  (b) [x]
- ---- ----------------------------------------------------------------------------------------------------
3    SEC Use Only

- ---- ----------------------------------------------------------------------------------------------------
4    Sources of Funds (See Instructions)

     PF
- ---- ----------------------------------------------------------------------------------------------------
5    Check Box if Disclosure of Legal Proceedings is Required Pursuant
     to Item 2(d) or 2(e)                                                                             [ ]
- ---- ----------------------------------------------------------------------------------------------------
6    Citizenship or Place of Organization

     United States of America
- ------------------- ------- -----------------------------------------------------------------------------
 Number of Shares     7     Sole Voting Power

                            10,177
                    ------- -----------------------------------------------------------------------------
   Beneficially       8     Shared Voting Power
     Owned by
                            0
                    ------- -----------------------------------------------------------------------------
       Each           9     Sole Dispositive Power
    Reporting
                            10,177
                    ------- -----------------------------------------------------------------------------
   Person With        10    Shared Dispositive Power

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

     10,177
- ---- ----------------------------------------------------------------------------------------------------
12   Check Box if the Aggregate Amount in Row (11) Excludes Certain Shares (See
     Instructions)                                                                                    [x]
- ---- ----------------------------------------------------------------------------------------------------
13   Percent of Class Represented by Amount in Row (11)

     0.6%
- ---- ----------------------------------------------------------------------------------------------------
14   Type of Reporting Person (See Instructions)

     IN
- ---- ----------------------------------------------------------------------------------------------------

</TABLE>


<PAGE>
 
<PAGE>

                                                      -------------------------
                                                      Page 5 of 9 Pages
                                                      -------------------------

Item 1. Security and Issuer.

                  The class of equity securities to which this Statement relates
is the  Common  Stock,  par  value  $.01  per  share  ("Shares"),  of  Barringer
Laboratories,  Inc., a Delaware  corporation (the "Issuer"),  with its principal
executive offices located at 15000 West 6th Avenue, Suite 300, Golden,  Colorado
80401-5047.

Item 2. Identity and Background.

                  The persons  filing this  Statement  are John P.  Holmes,  III
("JPH"), J. Francis Lavelle ("JFL") and Thomas A. Dippel ("TAD")  (collectively,
the  "Reporting  Persons").  Each  Reporting  Person is a citizen  of the United
States of America.

                  The Reporting Persons may be deemed to be a "group" within the
meaning of Rule 13d-5 promulgated under the Securities  Exchange Act of 1934, as
amended  (the  "Exchange  Act").  Each  Reporting  Person  disclaims  beneficial
ownership of Shares owned by the other Reporting Persons.

                  JPH's  principal   occupation  or  employment  is  serving  as
president and managing director of Ahern Partners,  a money management firm. JPH
also  serves as a managing  director  of Green Field  Capital  Management,  Inc.
("Green Field") and Aspetuck  Capital  Management Inc.  ("Aspetuck"),  which are
private investment firms. JPH's business address is c/o Ahern Partners, 18 Kings
Highway North, Westport, Connecticut 06880.

                  JFL's  principal  occupation  or  employment  is  serving as a
managing director of The Nassau Group, Inc.  ("Nassau"),  an investment  banking
firm which provides strategic  advisory services to its corporate  clients.  JFL
also serves as a managing  director of Green Field and Aspetuck.  JFL's business
address  is c/o The  Nassau  Group,  Inc.,  18 Kings  Highway  North,  Westport,
Connecticut 06880.

                  TAD's  principal  occupation  or  employment  is serving as an
associate  of  Nassau.  TAD also  serves  as an  associate  of Green  Field  and
Aspetuck. TAD's business address is c/o The Nassau Group, Inc., 18 Kings Highway
North, Westport, Connecticut 06880.

                  No  Reporting  Person  has during the last five years (i) been
convicted in a criminal  proceeding  (excluding  traffic  violations  or similar
misdemeanors)  or (ii)  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.

Item 3. Source and Amount of Funds or Other Consideration.

                  The aggregate purchase price for 100,000 of the 126,435 Shares
beneficially  owned by JPH, including payment of commissions,  was $96,500.  The
purchase of these  Shares was funded from cash  available  to JPH.  JPH acquired
beneficial  ownership of the other 26,435 Shares pursuant to the issuance by the
Issuer to JPH of the JPH Warrant described in Item 6.

                  The aggregate purchase price for 100,000 of the 126,435 Shares
beneficially  owned by JFL, including payment of commissions,  was $96,500.  The
purchase of these  Shares was funded from cash  available  to JFL.  JFL acquired
beneficial  ownership of the other 26,435 Shares pursuant to the issuance by the
Issuer to JFL of the JFL Warrant described in Item 6.

<PAGE>
 
<PAGE>

                                                      -------------------------
                                                      Page 6 of 9 Pages
                                                      -------------------------

                  The  aggregate  purchase  price for 8,047 of the 10,177 Shares
beneficially  owned by TAD,  including payment of commissions,  was $7,765.  The
purchase of these  Shares was funded from cash  available  to TAD.  TAD acquired
beneficial  ownership of the other 2,130 Shares  pursuant to the issuance by the
Issuer to TAD of the TAD Warrant described in Item 6.

Item 4. Purpose of Transaction.

                  Each  Reporting  Person  acquired  his Shares  for  investment
purposes. Each Reporting Person believes that the Shares represent an attractive
investment  opportunity.  Each  Reporting  Person will  continue to evaluate his
investment in the Issuer on the basis of various factors, including the Issuer's
business,  financial  condition,  results of operations and  prospects,  general
economic and industry  conditions,  the securities  markets in general and those
for the Issuer's securities in particular, such Reporting Person's own financial
condition,  other investment opportunities and other future developments.  Based
upon such evaluation, each Reporting Person will take such actions in the future
as such  Reporting  Person may deem  appropriate  in light of the  circumstances
existing  from time to time.  If any  Reporting  Person  believes  that  further
investment in the Issuer is warranted,  whether because of the market prices for
the  Issuer's  securities  or  otherwise,  such  Reporting  Person  may  acquire
additional  Shares or other  securities  (in addition to the  warrants  that the
Issuer has agreed to issue to the  Reporting  Persons as  described  in Item 6),
either in the open market or in privately  negotiated  transactions.  Similarly,
depending  on market and other  factors,  a Reporting  Person may  determine  to
dispose of some or all of the Shares owned by such Reporting Person.

                  Except  as set  forth  above in this  Item 4 and in Item 6, no
Reporting  Person has plans or  proposals  with  respect  to any of the  actions
specified in clauses (a) through (j) of Item 4 of Schedule 13D.

Item 5. Interest in Securities of the Issuer.

                  (a) The following table sets forth information with respect to
the  Shares  beneficially  owned by each  Reporting  Person  as of the  close of
business on May 23, 1996:


<TABLE>
<CAPTION>

                                    Number of                          Approximate Percentage of
         Name                       Shares                             Outstanding Shares (1)
         ----                       ---------                          -------------------------
<S>                                   <C>                                          <C> 
          JPH                         126,435(2)(3)                                7.7%

          JFL                         126,435(2)(4)                                7.7%

          TAD                          10,177(2)(5)                                0.6%

</TABLE>

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

(1)   Computed on the basis of 1,652,016 Shares outstanding as of March 31, 1996
      as  specified  in the  Issuer's  Quarterly  Report on Form  10-QSB for the
      quarter ended March 31, 1996.

(2)   The Reporting  Persons may be deemed to be a "group" within the meaning of
      Rule  13d-5   promulgated   under  the  Exchange  Act,  by  virtue  of  an
      understanding  between  them to act  together  from  time to time  for the
      purpose of  acquiring  holding,  voting,  or  disposing  of Shares.  Thus,
      pursuant  to  Rule  13d-5,   each  Reporting   Person  may  be  deemed  to
      beneficially  own all  Shares  beneficially  owned by the other  Reporting
      Persons.  Each Reporting  Person  disclaims  beneficial  ownership of such
      Shares.

<PAGE>
 
<PAGE>

                                                      -------------------------
                                                      Page 7 of 9 Pages
                                                      -------------------------


(3)   Includes  26,435 Shares that JPH has the right to acquire upon exercise of
      the JPH Warrant  described in Item 6. Excludes 4,006 Shares  issuable upon
      exercise of warrants  that the Issuer has agreed to issue to JPH within 60
      days of this Statement as described in Item 6.

(4)   Includes  26,435 Shares that JPL has the right to acquire upon exercise of
      the JFL Warrant  described in Item 6. Excludes 4,006 Shares  issuable upon
      exercise of warrants  that the Issuer has agreed to issue to JFL within 60
      days of this Statement as described in Item 6.

(5)   Includes  2,130 Shares that TAD has the right to acquire upon  exercise of
      the TAD Warrant  described in Item 6.  Excludes 322 Shares  issuable  upon
      exercise of warrants  that the Issuer has agreed to issue to TAD within 60
      days of this Statement as described in Item 6.

                  (b) JPH has the sole  power to vote or to direct  the vote and
to dispose or to direct the  disposition of 100,000 Shares that he  beneficially
owns.  Upon exercise  in whole  of the JPH Warrant, JPH will have sole power  to
vote or  to  direct the vote or to dispose or to direct the  disposition  of the
other 26,435 Shares that he beneficially owns.

                  JFL has the  sole  power to vote or to  direct  the vote or to
dispose or to direct the  disposition  of 100,000  Shares  that he  beneficially
owns.  Upon  exercise in whole of the JFL  Warrant,  JFL will have sole power to
vote or to direct the vote or to dispose  or to direct  the  disposition  of the
other 26,435 Shares that he beneficially owns.

                  TAD has the  sole  power to vote or to  direct  the vote or to
dispose or to direct the disposition of 8,047 Shares that he beneficially  owns.
Upon  exercise in whole of the TAD Warrant,  TAD will have sole power to vote or
to direct the vote or to dispose or to direct the disposition of the other 2,130
Shares that he beneficially owns.

                  (c) On May 15,  1996,  pursuant  to the DMFR  Letter of Intent
described in Item 6, JPH, JFL and TAD acquired beneficial  ownership of 100,000,
100,000 and 8,047 Shares, respectively, from D.M.F.R. Group USA Co. ("DMFR") for
$.95  per  Share  in  cash,  excluding  brokerage  commissions,  in a  privately
negotiated transaction in the over-the-counter market.

                  To induce the  Reporting  Persons to  consummate  the purchase
from DMFR described  above,  on May 13, 1996, the Issuer issued to the Reporting
Persons the JPH Warrant, the JFL Warrant and the TAD Warrant.

                  (d) No other  person  has the right to receive or the power to
direct the receipt of  dividends  from,  or the  proceeds  from the sale of, any
Shares which the Reporting Persons may be deemed to beneficially own.

                  (e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships
        with respect to Securities of the Issuer.

                  Green Field, on behalf of the Reporting Persons,  entered into
a letter of intent  dated April 23, 1996 with DMFR,  a copy of which is attached
hereto as Exhibit 1 (the "DMFR letter of Intent") and is incorporated  herein by
reference,  pursuant to which the  Reporting  Persons  purchased an aggregate of
208,047 Shares as described in Item 5(c).

                  On behalf of the Reporting  Persons,  Green Field also entered
into a letter  agreement dated May 13, 1996 with the Issuer,  a copy of which is
attached hereto as Exhibit 2 (the "Issuer Letter") and is incorporated herein by
reference, pursuant to which the Issuer agreed to issue the JPH Warrant, the JFL
Warrant and the TAD Warrant.  In addition,  the Issuer Letter  provides that the
Issuer will issue to the Reporting  Persons  additional  warrants to purchase an
aggregate  of 25,000  Shares at $1.06 per Share and  25,000  Shares at $1.25 per
Share.  These warrants will be issued to the Reporting  Persons  beginning on or
around June 15, 1996 at a rate of 4,167 per month for twelve months. The form of
these  warrants  will be  substantially  the  same as the JPH  Warrant,  the JFL
Warrant and the TAD Warrant.  The Issuer Letter  further  provides that (i) upon
the acquisition by the Reporting Persons and persons affiliated  therewith of at
least 165,000  Shares,  the Issuer's Board of Directors will nominate either JPH
or JFL to the Board and (ii) upon the  acquisition by the Reporting  Persons and
persons  affiliated  therewith of at least 330,000 Shares, the Issuer's Board of
Directors will nominate both JPH and JFL to the Board.

<PAGE>
 
<PAGE>

                                                      -------------------------
                                                      Page 8 of 9 Pages
                                                      -------------------------

                  On May  13,  1996,  the  Issuer  issued  to  JPH,  JFL and TAD
warrants to purchase 26,435,  26,435 and 2,130 Shares,  respectively,  copies of
which are attached hereto as Exhibit 3 (the "JPH Warrant"),  Exhibit 4 (the "JFL
Warrant") and Exhibit 5 (the "TAD Warrant"),  respectively, and are incorporated
herein by reference.  The warrants are exercisable,  in whole or in part, at any
time or from time to time  prior to May 13,  2001 at a price per Share of $1.06.
The warrants also provide for certain demand and incidental  registration rights
with respect to Shares issuable upon exercise thereof.

                  The Issuer also  entered into an  engagement  letter dated May
13, 1996 with  Nassau,  a copy of which is  attached  hereto as Exhibit 6 and is
incorporated  herein by reference,  pursuant to which the Issuer  engaged Nassau
through at least June 1, 1998 to provide  the  Issuer  with  certain  investment
banking services.

                  The  Reporting  Persons  are also  parties  to a Joint  Filing
Agreement,  a copy of which is attached  hereto as Exhibit 7 and is incorporated
herein by  reference,  with  respect  to the  filing of this  Statement  and any
amendments hereto.

                  Except as described in this Statement, there are no contracts,
arrangements,  understandings  or  relationships  (legal or otherwise) among the
persons  named in Item 2 hereof and between  such  persons and any other  person
with respect to any  securities  of the Issuer,  including,  but not limited to,
transfer or voting of any of such  securities,  finder's fees,  joint  ventures,
loan or option arrangements,  puts or calls, guarantees of profits,  division of
profits or loss, or the giving or withholding of proxies.

Item 7. Material to be Filed as Exhibits.

<TABLE>
<S>          <C>
Exhibit 1    Letter of Intent dated April 23, 1996 between Green Field and DMFR.

Exhibit 2    Letter Agreement dated May 13, 1996 between Green Field and the Issuer.

Exhibit 3    Warrant dated May 13, 1996 to purchase 26,435 Shares issued by the Issuer to JPH.

Exhibit 4    Warrant dated May 13, 1996 to purchase 26,435 Shares issued by the Issuer to JFL.

Exhibit 5    Warrant dated May 13, 1996 to purchase 2,130 Shares issued by the Issuer to TAD.

Exhibit 6    Engagement Letter dated May 13, 1996 between Nassau and the Issuer.

Exhibit 7    Joint Filing Agreement dated May 23, 1996 by and among the Reporting Persons.


<PAGE>
 
<PAGE>

                                                      -------------------------
                                                      Page 9 of 9 Pages
                                                      -------------------------



                                   SIGNATURES

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

Dated:  May 23, 1996


                                            /s/ John P. Holmes, III
                                       ___________________________________
                                                John P. Holmes, III



                                             /s/ J. Francis Lavelle
                                       ___________________________________
                                                 J. Francis Lavelle



                                           /s/ Thomas A. Dippel
                                       ___________________________________
                                               Thomas A. Dippel




<PAGE>
 
<PAGE>


                                      Exhibit Index


</TABLE>
<TABLE>
<CAPTION>

         Exhibit           Description
         Number            of Document
         -------           -----------

<S>                        <C>
         1                 Letter of Intent dated April 23
                           1996, between Green Field and
                           DMFR.

                           Letter Agreement dated May 13
         2                 1996 between Green Field and
                           the Issuer.

         3                 Warrant dated May 13, 1996 to
                           purchase 26,435 Shares issued
                           by the Issuer to JPH.

         4                 Warrant dated May 13, 1996 to
                           purchase 26,435 Shares issued
                           by the Issuer to JFL.

         5                 Warrant dated May 13, 1996 to
                           purchase 2,130 Shares issued by
                           the Issuer to TAD.

         6                 Engagement Letter dated May
                           13, 1996 between Nassau and the
                           Issuer.

         7                 Joint Filing Agreement dated
                           May 23, 1996 by and among the
                           Reporting Persons.

</TABLE>







<PAGE>
 





                                                                       Exhibit 1

                      GREEN FIELD CAPITAL MANAGEMENT, INC.
               18 Kings Highway North Westport, Connecticut 06880
                         203-227-3392 Fax: 203-227-4718
- --------------------------------------------------------------------------------




STRICTLY CONFIDENTIAL


                                                                  April 23, 1996


D.M.F.R. Group USA Co.
65 High Ridge Road
Unit 247
Stamford, Connecticut  06905


                                LETTER OF INTENT

Dear Sirs:

         The following sets forth the principal terms and conditions of a
proposed transaction (the "Transaction") between Green Field Capital Management,
Inc., together with certain of its affiliates and other third party investors
("Green Field"), and D.M.F.R. Group USA Co. ("Seller") relating to shares of
Barringer Laboratories, Inc. ("Barringer").

         1.       Form of Transaction.

                  Green Field will acquire 208,047 shares of common stock par
                  value $ 0.01 of Barringer from Seller.

         2.       Consideration.

                  The purchase price per share shall be $0.95.

         3.       Representations, Warrants, Covenants and Indemnities.

                  The parties will negotiate in good faith representations,
                  warranties, covenants and indemnities customary to
                  transactions of this kind.

         4.       Conditions Precedent to Closing.

                  a.   The preparation, execution and delivery of a mutually
                       satisfactory definitive stock purchase agreement;

                  b.   obtaining all necessary approvals, consents, waivers and
                       clearances from governmental and other regulatory
                       authorities, lenders and others;

<PAGE>
 
<PAGE>


D.M.F.R. Group USA Co.
April 23, 1996
page 2

                  c.   Green Field's satisfactory completion, in its sole
                       discretion, of a due diligence review of Barringer;

                  d.   negotiations and execution of such additional agreements
                       as shall be necessary or advisable.

         5.       Closing Date.

                  It is anticipated that the closing of the transaction will
                  take place in less than 30 days from the date of the execution
                  of this Letter of Intent.

         6.       Exclusivity.

                  For a period of 15 days from May 6, 1996, neither the Seller
                  or any of its affiliates nor any of their respective officers,
                  directors, employees, agents or representatives will, either
                  directly or indirectly, entertain or conduct discussions with
                  any person with respect to any offer for the purchase or sale
                  of its shares of Barringer. The term "person" as used in this
                  letter shall be interpreted to include without limitation any
                  corporation, company, group, partnership or individual.

         7.       Expenses.

                  Each party will pay for its own legal, accounting and other
                  expenses in connection with the transaction.

         8.       Public Announcements.

                  Public announcements will be made as required by law; the
                  parties will consult prior to the issuance thereof.

         9.       Non-Binding Effect.

                  Except as to Paragraphs 6 and 7, this Letter of Intent does
                  not constitute a definitive agreement or a binding offer and
                  acceptance; it is a non-binding Letter of Intent, intended to
                  serve as a format for the initiation of discussions between
                  the parties thereof and shall be binding, upon the completion
                  of all of the conditions precedent referred to above
                  including, but not limited to, the execution of definitive
                  agreements.



<PAGE>
 
<PAGE>

D.M.F.R. Group USA Co.
April 23, 1996
page 3


         If the foregoing correctly sets forth your understanding, please sign
in the space provided below and return an executed copy to the undersigned.

                                       Very truly yours,

                                       GREEN FIELD CAPITAL
                                       MANAGEMENT, INC.



                                       By:   /s/ John P. Holmes
                                          ______________________________________
Accepted and agreed to as of                 Mr. John P. Holmes
the date first above written                 Managing Director


D.M.F.R. GROUP USA CO.



By:      /s/ Mario Catelli
      _____________________________

Name:        Mario Catelli
      _____________________________

Title:       President
      _____________________________



<PAGE>
 





                                                                       Exhibit 2

                      GREEN FIELD CAPITAL MANAGEMENT, INC.
               18 Kings Highway North Westport, Connecticut 06880
                         203-227-3392 Fax: 203-227-4718
- --------------------------------------------------------------------------------


J. Francis Lavelle
Managing Director





STRICTLY CONFIDENTIAL

                                                                    May 13, 1996


Mr. Robert H. Walker
President
Barringer Laboratories, Inc.
15000 West 6th Avenue
Suite 300
Golden, Colorado  80401-5047

Dear Bob:

         We attach the form of warrant agreement for the initial three tranches
of Warrants to be issued to J. Francis Lavelle, John P. Holmes and Thomas A.
Dippel as of today. As per our April 25, 1996 agreement with Barringer
Laboratories, Inc. (the "Company") and contingent upon Green Field or its
designees' purchase of at least 10% of the outstanding shares of the Company
within 30 days of this Agreement, the Company agrees to issue to each of us on
the 15th of each month for the next 12 months (June 1996 to May 1997) additional
Warrants covering the following amount of shares (in the final month, the total
will have to be reduced by four shares):

          Mr. J. Francis Lavelle    2,003 shares per month (24,034 total)
          Mr. John P. Holmes        2,003 shares per month (24,034 total)
          Mr. Thomas A. Dippel      161 shares per month    (1,932 total)

                  The Company may with 90 days notice terminate the above
         vesting process and the issuance of additional Warrants. Such Warrants
         shall be issued on a monthly basis substantially in the same form as
         that attached hereto as Exhibit A. The first 25,000 of such Warrants
         shall be exercisable at $1.06; the remaining 25,000 shall be
         exercisable at $1.25.

         Furthermore, it is agreed and understood that if Green Field or its
designees purchase at least 10% of the outstanding shares of the Company within
30 days of this Agreement, the Company's Board of Directors agrees to nominate
Mr. J. Francis Lavelle or Mr. John P. Holmes (at the sole discretion of Green
Field Capital Management, Inc.) to its Board of Directors within 30 days of
Green Field or its designees' acquiring 10% of the Company's outstanding shares,
i.e. approximately 165,000 shares. To the extent that Green Field or its
designees subsequently acquire 20% or more of the Company's outstanding shares,
i.e. approximately 330,000 shares, the Company's Board of Directors agrees to
nominate Mr. J. Francis Lavelle and Mr. John P. Holmes to its Board of Directors
within 30 days of Green Field or its designees' acquiring such an ownership
position.


<PAGE>
 
<PAGE>


Mr. Robert H. Walker
May 13, 1996
page 2


         If the foregoing is in accordance with your understanding of our
agreement, kindly sign where indicated below and return an executed copy to us
via fax.


                                       GREEN FIELD CAPITAL
                                       MANAGEMENT, INC.



                                       By:  /s/ J. Francis Lavelle
                                          ______________________________________
                                          Mr. J. Francis Lavelle
                                          Managing Director


AGREED TO:

BARRINGER LABORATORIES, INC.



By:  /s/ Robert H. Walker
   ____________________________________
   Mr. Robert H. Walker
   President and CEO




Attachment:  Exhibit A


<PAGE>
 





                                                                       Exhibit 3



          THESE  WARRANTS,  AND THE  SECURITIES  ISSUABLE  UPON EXERCISE
          HEREOF,  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF
          1933,  AS  AMENDED,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED  OR
          OTHERWISE  DISPOSED  OF  UNLESS  THE  SAME ARE  REGISTERED  IN
          ACCORDANCE  WITH  SAID  ACT,  OR  IT  IS  ESTABLISHED  TO  THE
          SATISFACTION  OF THE  COMPANY  THAT SUCH  REGISTRATION  IS NOT
          REQUIRED.


                 Void after 5:00 p.m., New York, New York Time,
                                 on May 13, 2001



                          WARRANTS FOR THE PURCHASE OF

             26,435 SHARES OF COMMON STOCK, $.01 PAR VALUE PER SHARE

                                       OF

                          BARRINGER LABORATORIES, INC.




                  This Is To Certify  That,  FOR VALUE  RECEIVED,  Mr. John.  P.
Holmes,  or his  successors  and permitted  assigns  ("Holder"),  is entitled to
purchase,   subject  to  the  provisions  of  these  Warrants,   from  Barringer
Laboratories, Inc., a Delaware corporation ("Company"), Twenty Six Thousand Four
Hundred Thirty Five (26,435) duly  authorized,  validly  issued,  fully paid and
nonassessable  shares of Common Stock,  $.01 par value per share, of the Company
("Common Stock"),  at One Dollar and Six Cents ($1.06) per share, at any time or
from time to time during the period from May 13, 1996 to May 13,  2001,  but not
later than 5:00 p.m.,  New York,  New York time on May 13,  2001.  The number of
shares of  Common  Stock  which the  Holder is  entitled  to  purchase  upon the
exercise  of each  Warrant and the  exercise  price to be paid for each share of
Common Stock may be adjusted  from time to time as  hereinafter  set forth.  The
shares of Common Stock deliverable upon such exercise,  as adjusted from time to
time, are hereinafter sometimes referred to as "Warrant Shares" and the exercise
price for one (1) Warrant  Share in effect at any time and as adjusted from time
to time is hereinafter sometimes referred to as the "Exercise Price".


                                      -1-


<PAGE>
 
<PAGE>



                  1.       EXERCISE OF WARRANTS.

                  a. These  Warrants may be exercised in whole or in part at any
time or from time to time on or after May 13,  1996 and until May 13,  2001.  If
these  Warrants shall be exercised on any day on which banking  institutions  in
the State of New York are  authorized  or required  by law to close,  then these
Warrants shall be deemed exercised on the next succeeding day which shall not be
such a day. These Warrants may be exercised by presentation and surrender hereof
to the Company at its principal  office (or to the stock transfer agent, if any,
of the  Company at its  office),  with the  Purchase  Form  annexed  hereto duly
executed and  accompanied  by payment of the  aggregate  Exercise  Price for the
number of Warrant Shares specified in such Purchase Form. The aggregate Exercise
Price for such  Warrant  Shares  may be  tendered  to the  Company  in cash,  by
certified check or bank draft, by conversion of any indebtedness  outstanding at
such time of the Company to the  Holder,  if the Common  Stock is then  publicly
traded,  in  Warrants  (valued  for this  purpose  at their  fair  market  value
determined  as  provided  in  subparagraph  (b)  below),  or by any  combination
thereof.  Any  request  for  exercise  must be  accompanied  by such  investment
representations  as  are  reasonably  requested  by  the  Company.  As  soon  as
practicable  after each such  exercise of a Warrant,  but not later than 30 days
from the date of such  exercise,  the  Company  shall  issue and  deliver to the
Holder a certificate or  certificates  for the Warrant Shares issuable upon such
exercise,  in such  denomination or denominations and registered in such name or
names as the Holder shall have specified in the Purchase Form; provided, that if
a certificate or certificates  for Warrant Shares are to be registered in a name
or names other than the name of the  Holder,  and the  transfer of such  Warrant
Shares is not made pursuant to a registration statement under the Securities Act
of 1933,  as amended (the  "Securities  Act"),  the Holder shall  deliver to the
Company a legal  opinion  reasonably  satisfactory  to the Company to the effect
that such transfer is not required to be registered under the Securities Act. If
these  Warrants  should be  exercised  in part only,  the  Company  shall,  upon
surrender of these Warrants for  cancellation,  execute and deliver new Warrants
substantially in the form hereof  evidencing the rights of the Holder thereof to
purchase  the  balance of the Warrant  Shares  covered by these  Warrants.  Upon
receipt by the Company of these Warrants at its office, or by the stock transfer
agent of the Company at its office,  in proper form for exercise,  the Holder or
its designee  shall be deemed to be the holder of record of the shares of Common
Stock issuable upon such exercise, notwithstanding that the stock transfer books
of the  Company  shall  then be closed or that  certificates  representing  such
shares of Common Stock shall not then be  physically  delivered to the Holder or
its designee.


                                      -2-


<PAGE>
 
<PAGE>



                  b. Payment for the Exercise  Price  tendered in Warrants under
subparagraph  (a) above shall be by presentation and surrender of such Warrants,
and the Warrants so delivered  shall be valued at an amount equal to the product
of (x) the number of Warrant Shares  deliverable  upon exercise of such Warrants
and (y) the  excess,  if any,  of (i) the  average of the  closing  price of the
Common Stock on the  principal  exchange on which the Common Stock is traded for
the trading days  (during  which the Common Stock  actually  traded)  during the
90-day  period  preceding  the date of exercise  or, if the Common  Stock is not
traded on an  exchange,  the average  closing  price of the Common  Stock in the
over-the-counter  market for the trading  days  (during  which the Common  Stock
actually  traded)  during the 90-day period  preceding the date of exercise over
(ii) the Exercise Price.

                  2.  RESERVATION  OF  SHARES.  The  Company  shall at all times
reserve and keep  available,  free from preemptive  rights,  for issuance and/or
delivery  upon  exercise  of these  Warrants,  such number of shares of its duly
authorized  and  unissued  Common  Stock,  as shall be required for issuance and
delivery of Warrant  Shares upon exercise in full of all  outstanding  Warrants.
All shares of Common Stock which are so issuable shall, when issued, be duly and
validly issued, fully paid and non-assessable and free from all taxes, liens and
charges.

                  3.   FRACTIONAL   SHARES.   No  fractional   shares  or  scrip
representing  fractional  shares  shall be  issued  upon the  exercise  of these
Warrants. In lieu of issuing a fraction of a share, the number of Warrant Shares
to be received upon any exercise shall be rounded up to the next whole share.

                  4.  ASSIGNMENT  OR LOSS OF  WARRANT.  These  Warrants  are not
assignable  without the prior  written  consent of the Company,  except that the
Holder may assign these  Warrants,  in whole or in part, to any affiliate of the
Holder  without  the  consent of the  Company.  Further,  any  assignee  of such
Warrants  (except for  affiliates  of the Holder) shall provide the Company with
such investment  representations  as the Company may reasonably  request and the
Holder shall provide the Company with a legal opinion reasonably satisfactory to
the Company that such transfer may be effected  without  registration  under the
Securities  Act.  Subject to the Company's  consent and receipt of the foregoing
(if required),  upon surrender of these Warrants to the Company at its principal
office or at the office of its stock transfer  agent, if any, with an Assignment
Form reasonably  acceptable to the Company duly executed and funds sufficient to
pay any transfer tax, the Company  shall,  without charge to the assignor or the
assignee,  execute  and deliver a new Warrant or Warrants of like tenor as these
Warrants  in  the  name  or  names  of  the  assignee  or  assignees  and in the
denomination or  denominations  specified in such


                                      -3-


<PAGE>
 
<PAGE>

instrument of assignment, and these Warrants shall promptly be canceled. If less
than all of these  Warrants  are being  assigned,  new Warrants of like tenor as
these  Warrants  shall be issued  and  delivered  to the  Holder  hereof for the
portion of these Warrants not being assigned.

                  Upon receipt by the Company of evidence  satisfactory to it of
the loss, theft,  destruction or mutilation of these Warrants,  and (in the case
of loss, theft or destruction) of reasonably satisfactory  indemnification,  and
upon surrender and  cancellation  of these Warrants,  if mutilated,  the Company
will execute and deliver new Warrants of like tenor and date  exercisable for an
equivalent number of shares of Common Stock.

                  5. RIGHTS OF THE HOLDER. The Holder shall not by virtue hereof
be entitled to any rights as a shareholder  of the Company,  either at law or in
equity,  and the  rights  of the  Holder  are  limited  to  those  expressed  or
incorporated  in these  Warrants  and are not  enforceable  against  the Company
except to the extent set forth or incorporated herein.

                  6. ANTI-DILUTION  PROVISIONS.  The Exercise Price in effect at
any time and the number and kind of securities  purchasable upon the exercise of
the Warrants shall be subject to adjustment from time to time upon the happening
of certain events, as follows:

                       a. In case the  Company  shall (i)  declare a dividend or
make a  distribution  on its  outstanding  shares of  Common  Stock in shares of
Common Stock,  (ii)  subdivide or reclassify  its  outstanding  shares of Common
Stock  into a greater  number of shares,  or (iii)  combine  or  reclassify  its
outstanding shares of Common Stock into a smaller number of shares, the Exercise
Price shall be adjusted,  effective  immediately  after the record date for such
dividend or distribution or the effective date of such subdivision,  combination
or reclassification,  to a price determined by multiplying the Exercise Price in
effect  immediately  prior to such record date or effective  date by a fraction,
the numerator of which shall be the number of shares of Common Stock outstanding
immediately  before giving effect to such dividend,  distribution,  subdivision,
combination  or  reclassification,  and the  denominator  of which  shall be the
number of  shares  of  Common  Stock  outstanding  after  giving  effect to such
dividend, distribution, subdivision, combination or reclassification.

                       b. Whenever the Exercise Price payable upon exercise of a
Warrant is adjusted  pursuant to subparagraph  (a) above,  the number of Warrant
Shares  purchasable upon exercise of a Warrant shall  simultaneously be adjusted
by multiplying the number of Warrant Shares purchasable immediately prior to any
adjustment by the Exercise Price in effect immediately prior to any


                                      -4-


<PAGE>
 
<PAGE>

adjustment  and  dividing  the  product so  obtained  by the  Exercise  Price as
adjusted.

                       c. The  provisions of this paragraph 6 shall not apply to
(i) the issue,  sale,  distribution or grant of any shares of Common Stock,  any
rights,  warrants or options to subscribe for or purchase shares of Common Stock
or any securities convertible into or exchangeable for shares of Common Stock to
officers,  directors or employees of the Company pursuant to a compensation plan
that  currently  exists  and has been,  or in the  future may exist and will be,
approved by the  stockholders  of the Company or (ii) the  issuance of shares of
Common  Stock to  officers,  directors  or  employees  of the  Company  upon any
exercise  of rights,  warrants  or  options,  or any  conversion  or exchange of
convertible  or  exchangeable  securities,  described  in clause (i)  above.  No
adjustment to the Exercise Price shall be required unless such adjustment  would
require an increase  or  decrease  of at least five cents  ($.05) in such price;
provided, however, that any adjustments which by reason of this subparagraph (c)
are not  required to be made shall be carried  forward and taken into account in
any subsequent  adjustment made under this paragraph 6. All  calculations  under
this  paragraph  6  shall  be  made  to  the  nearest  cent  or to  the  nearest
one-hundredth  of a share,  as the case may be.  Anything in this paragraph 6 to
the contrary  notwithstanding,  the Company shall be entitled,  but shall not be
required, to reduce the Exercise Price, in addition to those required reductions
by this  paragraph  6, as it  shall  determine,  in its sole  discretion,  to be
advisable in order that any dividend or  distribution in shares of Common Stock,
or any subdivision,  reclassification or combination of Common Stock,  hereafter
made by the Company shall not result in any federal  income tax liability to the
holders of Common Stock or securities  convertible  into Common Stock (including
Warrants).

                       d.  Whenever  the  Exercise  Price is  adjusted as herein
provided,  the Company shall  promptly cause a notice setting forth the adjusted
Exercise Price and adjusted number of Warrant Shares issuable upon exercise of a
Warrant to be mailed to the Holder, at its last address appearing in the Warrant
Register (as hereinafter  defined),  and shall cause a certified copy thereof to
be mailed to the Company's  stock transfer agent, if any. The Company may retain
a  firm  of  nationally  recognized  independent  certified  public  accountants
selected by the Board of Directors (who may be the regular accountants  employed
by the  Company) to make any  computation  required by this  paragraph  6, and a
certificate signed by such firm shall be conclusive  evidence of the correctness
of such adjustment.

                       e. In the  event  that at any  time,  as a  result  of an
adjustment  made  pursuant to  subparagraph  (a) above,  the Holder of a Warrant
thereafter shall become entitled to receive any


                                      -5-


<PAGE>
 
<PAGE>

shares of the Company  other than Common  Stock,  thereafter  the number of such
other  shares so  receivable  upon  exercise  of a Warrant  shall be  subject to
adjustment  from time to time in a manner and on terms as nearly  equivalent  as
practicable  to the  provisions  with respect to the Common  Stock  contained in
subparagraph (a).

                       f.  Irrespective of any adjustments in the Exercise Price
or the number or kind of Warrant Shares  purchasable upon exercise of a Warrant,
Warrants issued in substitution or replacement of these Warrants may continue to
express  the same  Exercise  Price and number and kind of Warrant  Shares as are
stated in such substituted or replaced Warrants.

                       g. As a condition  precedent  to the taking of any action
which would  require an  adjustment  pursuant to this  paragraph  6, the Company
shall take any action  which may be  necessary  in order  that the  Company  may
thereafter validly and legally issue as fully paid and nonassessable all Warrant
Shares  which the Holder of these  Warrants  is  entitled  to  receive  upon the
exercise thereof.

                       h. In case of any  consolidation  or  merger to which the
Company is a party, other than a consolidation or merger in which the Company is
a continuing  corporation and which does not result in any  reclassification  or
conversion of, or change in, the outstanding shares of Common Stock, or any sale
or conveyance of the property of the Company as an entirety or  substantially as
an entirety (any such event being called a "Capital Reorganization") the Company
shall cause  effective  provisions  to be made so that the Holder shall have the
right  thereafter  by  exercising  these  Warrants  at any  time  prior to their
expiration,  to  receive  (in lieu of the  number  of  shares  of  Common  Stock
theretofore  deliverable)  cash in an amount per share of Common  Stock equal to
the excess,  if any, of (x) the fair market  value per share of Common  Stock of
the consideration  received in the Capital  Reorganization over (y) the Exercise
Price.

                  7.       REGISTRATION RIGHTS

                       a. Upon a written  request to register some or all of the
Warrant  Shares issued or issuable upon exercise of these  Warrants  pursuant to
the  Securities  Act from the holders  thereof,  the  Company  will use its best
efforts to register such Warrant Shares for resale by the holder thereof on Form
S-3 or any other  registration  form then available  ("S-3  Registration").  The
Company hereby agrees to use its best efforts to continue to qualify for the use
of Form S-3.

                       b. Each time the Company  shall  determine or be required
to proceed with the preparation and filing of a


                                      -6-


<PAGE>
 
<PAGE>

registration  statement under the Securities Act in connection with the proposed
public  offering of equity  securities  of the  Company,  the Company  will give
written  notice thereof to the holders of the Warrant  Shares.  Upon the written
request of any holder given within 20 days after receipt of any such notice from
the Company,  the Company  will,  except as herein  provided,  cause all Warrant
Shares for which such holder has so  requested  registration,  to be included in
such  registration  statement,  provided  that nothing  herein shall prevent the
Company from, at any time, withdrawing,  abandoning or delaying any registration
that is not required under (a) above, and provided  further,  that the rights of
any holder under this subsection  shall not extend (i) to  registrations on Form
S-8,  on Form S-4 or on any  other  Form  which  would  not  permit by its terms
inclusion  of the Warrant  Shares,  and (ii) to any  offering  initiated  by the
Company  for its own  account if the  Company  determines  in good  faith,  upon
consultation  with its  underwriter,  that the  inclusion of the Warrant  Shares
would  adversely  affect  the  success  of such  offering.  If any  registration
pursuant to this  subsection  shall be  underwritten,  in whole or in part,  the
Company may require that the Warrant Shares requested for inclusion  pursuant to
this subsection be included in the underwriting on the same terms and conditions
as the securities otherwise being sold through the underwriters.  If in the good
faith judgment  evidenced in writing of the  underwriter of such public offering
only a limited  number of  Warrant  Shares  should be  included  in such  public
offering,  or no such  Warrant  Shares  should be  included,  the holders of the
Warrant Shares,  and all other security  holders with  contractual  registration
rights,  shall be limited to  registering  such  proportion of their  respective
shares  as shall  equal the  proportion  that the  number  of shares of  selling
security holders  permitted to be registered by the underwriter in such offering
bears to the  total  number of all  shares  then  held by all  selling  security
holders desiring to participate in such offering.

                       c. If and whenever one or more holders of these  Warrants
and any Warrant Shares have requested pursuant to the provisions of subparagraph
(a) or (b) above that the Company effect the  registration of all of the Warrant
Shares under the Securities Act, the Company will:

                            (1)  prepare  and file with the SEC at the  earliest
practicable  date the  appropriate  registration  statement with respect to such
Warrant  Shares  and use all  reasonable  efforts  to  cause  such  registration
statement to become  effective as soon as  practicable  thereafter and to remain
effective for such period as may be  reasonably  necessary to effect the sale of
the Warrant  Shares,  but in any event no longer than two years from the date of
issuance of the Warrant Shares;


                                      -7-


<PAGE>
 
<PAGE>


                            (2)  prepare  and file with the SEC such  amendments
and supplements to such registration  statement and to the prospectus  contained
therein  as may be  reasonably  necessary  to keep such  registration  statement
effective  for such period set forth in  subparagraph  (1) above,  and to comply
with the provisions of the Securities Act with respect to the disposition of all
securities  covered  by  such  registration  statement  during  such  period  in
accordance  with the intended  methods of disposition by the sellers thereof set
forth in such registration statement;

                            (3) use all  reasonable  efforts to (i)  register or
qualify  the  Warrant  Shares,   concurrently  with  the  effectiveness  of  the
registration   statement,   under  the  Blue  Sky  or  securities  laws  of  any
jurisdiction such holder thereof  reasonably  requests,  and (ii) do any and all
other acts and things which may be  reasonably  necessary or advisable to enable
such holders to consummate the disposition in such  jurisdictions of the Warrant
Shares in  compliance  with such laws;  provided,  that the Company  will not be
required to (x) qualify  generally to do business in any  jurisdiction  where it
would not  otherwise  be  required  to qualify  but for this  subparagraph,  (y)
subject itself to taxation in any  jurisdiction  in which it is not otherwise so
subject  or (z) file any  general  consent  to  service  of  process in any such
jurisdiction;

                            (4) furnish to the holders who  participate  in such
registration such number of copies of the registration statement, each amendment
and supplement  thereto,  the preliminary  prospectus,  the final prospectus and
such  other  documents  as such  holders  may  reasonably  request  in  order to
facilitate the public offering of such Warrant Shares;

                            (5)  notify  the  holders  who  participate  in such
registration,  promptly after it shall receive notice thereof,  of the time when
such  registration  statement  has  become  effective  or a  supplement  to  any
prospectus forming a part of such registration statement has been filed;

                            (6) notify  any seller or sellers of Warrant  Shares
covered by such registration  statement,  at any time when a prospectus relating
thereto covered by such registration statement is required to be delivered under
the  Securities  Act,  of the  happening  of any  event as a result of which the
prospectus included in such registration  statement, as then in effect, includes
an  untrue  statement  of a  material  fact or omits to  state a  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
the light of the circumstances then existing,  not misleading and at the request
of such  seller or  sellers,  prepare  and  furnish to such  seller or sellers a
reasonable  number  of  copies  of a  supplement  to or  an  amendment  of  such
prospectus as may be necessary so that, as thereafter


                                      -8-


<PAGE>
 
<PAGE>

delivered to the purchasers of the Warrant  Shares,  such  prospectus  shall not
include an untrue  statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the statements  therein,  in
the light of the circumstances then existing, not misleading; and

                            (7) at the  request  of any  holder or  holders  who
participate in such  registration,  on the date that the registration  statement
with respect to such Warrant Shares  becomes  effective,  (i) an opinion,  dated
such  date,  of  counsel  representing  the  Company  for  the  purpose  of such
registration,  in form and substance as is customarily  given to underwriters in
an underwritten public offering,  addressed to the holder or holders making such
request; and (ii) a letter dated such date, from a firm of nationally recognized
independent  certified public accountants which represents the Company,  in form
and  substance  as  is  customarily   given  by  independent   certified  public
accountants to underwriters in an underwritten public offering, addressed to the
holder or holders making such request.

                       d.  Notwithstanding  anything  contained  herein  to  the
contrary,  the Company  shall not be  obligated  to use its best efforts to have
more than two registration  statements  declared  effective under the Securities
Act pursuant to these Warrants.  Furthermore, the Company shall not be obligated
to file any registration statements prior to May 13, 1997.

                       e. With respect to a registration hereunder,  the Company
shall  bear  all  of  the  following  fees,  costs  and  expenses  (collectively
"Registration  Expenses"):  all  registration,  filing and NASD  fees,  printing
expenses,  fees and disbursements of counsel for the Company and all independent
accountants for the Company,  underwriters (excluding discounts and commissions)
and other persons retained by the Company, messenger and delivery fees, transfer
agent and registrar fees and expenses, and the expenses and fees for any listing
of the  securities to be registered on each  securities  exchange (or NASDAQ) on
which similar securities issued by the Company are then listed; and expenses and
fees incurred in connection with  registration or  qualification  of the Warrant
Shares under Blue Sky or securities laws of the  jurisdictions  specified by the
holders thereof pursuant to subparagraph (c)(3) above.

                       f. (1) The Company will  indemnify and hold harmless each
holder of Warrant  Shares  participating  in a  registration  pursuant  to these
provisions,  and each broker or any other person acting on behalf of such holder
and each person,  if any, who controls any of the foregoing  persons  within the
meaning of the Securities Act, from and against any and all loss, claim, damage,
liability,  cost or expense  to which any of the  foregoing  persons  may become
subject under the Securities Act or otherwise,


                                      -9-



<PAGE>
 
<PAGE>

insofar as such  losses,  claims,  damages,  liabilities,  costs or expenses are
caused  by, are based  upon,  or arise out of any  untrue  statement  or alleged
untrue statement of any material fact contained in such registration  statement,
any prospectus  contained therein or any amendment or supplement thereto, or any
document  furnished or prepared by the Company  incident to the  registration or
qualification of the Warrant Shares pursuant to this paragraph 7 or the omission
or alleged  omission  to state  therein a material  fact  required  to be stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances  in which they were made, not misleading,  or any violation by the
Company of the Securities Act or state securities or Blue Sky laws applicable to
the  Company  or  relating  to action or  inaction  required  of the  Company in
connection with such  registration or qualification  under such state securities
or Blue Sky laws; and shall  reimburse such holder,  such broker or other person
acting on behalf of such holder and each controlling person for any legal or any
other  expenses   reasonably   incurred  by  any  of  them  in  connection  with
investigating or defending any such loss,  claim,  damage,  liability or action;
provided,  however,  that the Company will not be liable in any such case to the
extent that any such loss, claim, damage,  liability, cost or expense arises out
of or is based upon an untrue  statement or alleged untrue statement or omission
or  alleged  omission  so made in strict  conformity  with  written  information
furnished by such holder,  such  broker,  such other person  acting on behalf of
such holder or such controlling  person  specifically for use in the preparation
of such documents.

                            (2)  Each  holder  participating  in a  registration
hereunder  will  indemnify  and hold  harmless  the Company,  and its  officers,
directors and each person,  if any, who controls the Company  within the meaning
of the  Securities  Act,  from and  against  any and all  loss,  claim,  damage,
liability,  cost or expense to which the  Company or such  officer,  director or
controlling  person may become  subject under the  Securities  Act or otherwise,
insofar as such  losses,  claims,  damages,  liabilities,  costs or expenses are
caused by any untrue  statement or alleged untrue statement of any material fact
contained in such registration  statement,  any prospectus  contained therein or
any amendment or supplement  thereto,  or any document  furnished or prepared by
the Company  incident to the registration or qualification of the Warrant Shares
pursuant to this  paragraph 7 or the  omission or the alleged  omission to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances in which they were made, not
misleading,  but only to the extent that such untrue statement or alleged untrue
statement or omission or alleged  omission  was so made in reliance  upon and in
strict conformity with written information furnished by such holder specifically
for use in the preparation of such documents.


                                      -10-

<PAGE>
 
<PAGE>

                            (3) Each party  entitled  to  indemnification  under
this subparagraph (f) (the  "Indemnified  Party") shall give notice to the party
that allegedly is obligated  hereunder to indemnify the  Indemnified  Party (the
"Indemnifying Party") promptly after such Indemnified Party has actual knowledge
of any  claim  as to  which  indemnity  may be  sought,  and  shall  permit  the
Indemnifying  Party to assume the  defense  of any such claim or any  litigation
resulting therefrom; provided, however, that counsel for the Indemnifying Party,
who  shall  conduct  the  defense  of such  claim  or any  litigation  resulting
therefrom,  shall be approved by the Indemnified Party (whose approval shall not
unreasonably  be withheld),  and the  Indemnified  Party may participate in such
defense at such party's expense  (unless the  Indemnified  Party shall have been
advised by counsel  that actual or  potential  differing  interests  or defenses
exist or may exist between the Indemnifying  Party and the Indemnified Party, in
which case such expense shall be paid by the Indemnifying  Party);  and provided
further  that the  failure of any  Indemnified  Party to give notice as provided
herein shall not relieve the  Indemnifying  Party of its obligations  under this
subparagraph  (f). No  Indemnifying  Party,  in the defense of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any  settlement  that does not include as an
unconditional  term  thereof  the giving by the  claimant or  plaintiff  to such
Indemnified  Party of a release  from all  liability in respect to such claim or
litigation.

                       g.  Notwithstanding  anything to the  contrary  contained
herein,  the  holders  of  Warrant  Shares  shall  have no  registration  rights
hereunder  with respect to any proposed  sale of Warrant  Shares if an exemption
from  registration  pursuant to Rule 144 promulgated under the Securities Act is
available  for the offer and sale of all of the  Warrant  Shares  proposed to be
sold.

                  8.  CONDITION  PRECEDENT.  This  Warrant  is  subject  to  the
condition precedent that Nassau  and/or Green  Field  Capital  Management,  Inc.
and/or its designees  purchase,  in total,  ten percent  (approximately  165,000
shares) or more of the outstanding shares of the Company  within  30 days of the
date of this  Warrant. If this condition precedent shall fail, then this Warrant
shall be void ab initio and of no force or effect.

                  9.  MISCELLANEOUS

                  a. All notices and other communications provided for hereunder
shall be in writing (including  telegraphic,  telex or cable  communication) and
shall become  effective (i) when  personally  delivered on a business day during
normal  business  hours at the place of  receipt  to the party to be given  such
notice,  (ii) on the third  business day  following the day when  deposited,  if
mailed by certified or registered mail with return


                                      -11-


<PAGE>
 
<PAGE>

receipt  requested  and postage  thereon  fully  prepaid,  (iii) on the business
day  following  the  day  when  deposited  if  sent  by overnight courier, fully
prepaid,  or (iv) on the business day such notice shall have been sent by telex,
telegram,  telecopier,  cable  or  similar electronic device, fully prepaid. The
addresses for such notice shall be:

                  if to the Company, to:

                                    Barringer Laboratories, Inc.
                                    15000 West 6th Avenue, Suite 300
                                    Golden, CO 80401-5047
                                    Attention:  Mr. Robert H. Walker
                                                       President and CEO
or

                  if to the Holder, to:

                                    Mr. John P. Holmes
                                    c/o Ahern Partners
                                    18 Kings Highway
                                    Westport, Connecticut 06880
                                    Attention:  Mr. John P. Holmes

or at such other address as any of the foregoing parties shall from time to time
designate in writing to the other party in accordance herewith.

                  b. No failure or delay of the Holder in exercising  any right,
power or privilege  hereunder shall operate as a waiver  thereof,  nor shall any
single or partial  exercise  thereof,  or any abandonment or  discontinuance  of
steps to enforce such a right,  power or  privilege,  preclude any other further
exercise  thereof or the exercise of any other right,  power or  privilege.  The
rights and remedies of the Holder are cumulative and not exclusive of any rights
or remedies which it would  otherwise have. The provisions of these Warrants may
be amended, modified or waived if, but only if, such amendment,  modification or
waiver is in writing and is signed by the Holders of a majority of the  Warrants
outstanding;  provided, that no amendment, modification or waiver may change the
Exercise Price or the number of Warrant Shares subject to purchase upon exercise
of each Warrant  (including without limitation any adjustments or any provisions
with respect to  adjustments  or the manner of exercise)  without the consent in
writing of all of the Holders of the Warrants outstanding.

                  c. All covenants,  agreements and provisions of these Warrants
by or for the benefit of the Company  shall bind and inure to the benefit of its
successors and assigns hereunder.


                                      -12-

<PAGE>
 
<PAGE>


                  d.  THESE  WARRANTS  SHALL BE  GOVERNED  BY AND  CONSTRUED  IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

                  IN WITNESS WHEREOF,  Barringer  Laboratories,  Inc. has caused
this  Warrant to be  manually  executed  by its duly  authorized  President  and
attested by its duly authorized Secretary.


                  BARRINGER LABORATORIES, INC.



             By: /s/ Robert H. Walker
                _________________________________
                Robert H. Walker
                President and CEO


Dated:  May 13, 1996

Attest:


/s/ Charles E. Ramsay
_______________________________________
Charles E. Ramsay
Assistant Secretary






                                      -13-


<PAGE>
 
<PAGE>


                                  PURCHASE FORM


                                                     Dated: ______________, ____


                  The  undersigned  hereby  irrevocably  elects to exercise  the
within  Warrants to the extent of  purchasing  _____  Warrant  Shares and hereby
tenders payment of the aggregate Exercise Price therefor by the following means:
_________________________________________.  Any cash payments to be made in lieu
of issuing  fractional  shares should be payable to the order of the undersigned
and delivered at the indicated address.


                     INSTRUCTIONS FOR REGISTRATION OF STOCK



Name____________________________________________________________________________
                  (Please typewrite or print in block letters)



Address ________________________________________________________________________



                  Signature ______________________________________________

                  Address ________________________________________________







                                      -14-


<PAGE>
 






                                                                       Exhibit 4



          THESE  WARRANTS,  AND THE  SECURITIES  ISSUABLE  UPON EXERCISE
          HEREOF,  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF
          1933,  AS  AMENDED,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED  OR
          OTHERWISE  DISPOSED  OF  UNLESS  THE  SAME ARE  REGISTERED  IN
          ACCORDANCE  WITH  SAID  ACT,  OR  IT  IS  ESTABLISHED  TO  THE
          SATISFACTION  OF THE  COMPANY  THAT SUCH  REGISTRATION  IS NOT
          REQUIRED.


                 Void after 5:00 p.m., New York, New York Time,
                                 on May 13, 2001



                          WARRANTS FOR THE PURCHASE OF

             26,435 SHARES OF COMMON STOCK, $.01 PAR VALUE PER SHARE

                                       OF

                          BARRINGER LABORATORIES, INC.




                  This Is To Certify That,  FOR VALUE  RECEIVED,  Mr. J. Francis
Lavelle,  or his successors  and permitted  assigns  ("Holder"),  is entitled to
purchase,   subject  to  the  provisions  of  these  Warrants,   from  Barringer
Laboratories, Inc., a Delaware corporation ("Company"), Twenty Six Thousand Four
Hundred Thirty Five (26,435) duly  authorized,  validly  issued,  fully paid and
nonassessable  shares of Common Stock,  $.01 par value per share, of the Company
("Common Stock"),  at One Dollar and Six Cents ($1.06) per share, at any time or
from time to time during the period from May 13, 1996 to May 13,  2001,  but not
later than 5:00 p.m.,  New York,  New York time on May 13,  2001.  The number of
shares of  Common  Stock  which the  Holder is  entitled  to  purchase  upon the
exercise  of each  Warrant and the  exercise  price to be paid for each share of
Common Stock may be adjusted  from time to time as  hereinafter  set forth.  The
shares of Common Stock deliverable upon such exercise,  as adjusted from time to
time, are hereinafter sometimes referred to as "Warrant Shares" and the exercise
price for one (1) Warrant  Share in effect at any time and as adjusted from time
to time is hereinafter sometimes referred to as the "Exercise Price".



                                      -1-

<PAGE>
 
<PAGE>



                  1.       EXERCISE OF WARRANTS.

                  a. These  Warrants may be exercised in whole or in part at any
time or from time to time on or after May 13,  1996 and until May 13,  2001.  If
these  Warrants shall be exercised on any day on which banking  institutions  in
the State of New York are  authorized  or required  by law to close,  then these
Warrants shall be deemed exercised on the next succeeding day which shall not be
such a day. These Warrants may be exercised by presentation and surrender hereof
to the Company at its principal  office (or to the stock transfer agent, if any,
of the  Company at its  office),  with the  Purchase  Form  annexed  hereto duly
executed and  accompanied  by payment of the  aggregate  Exercise  Price for the
number of Warrant Shares specified in such Purchase Form. The aggregate Exercise
Price for such  Warrant  Shares  may be  tendered  to the  Company  in cash,  by
certified check or bank draft, by conversion of any indebtedness  outstanding at
such time of the Company to the  Holder,  if the Common  Stock is then  publicly
traded,  in  Warrants  (valued  for this  purpose  at their  fair  market  value
determined  as  provided  in  subparagraph  (b)  below),  or by any  combination
thereof.  Any  request  for  exercise  must be  accompanied  by such  investment
representations  as  are  reasonably  requested  by  the  Company.  As  soon  as
practicable  after each such  exercise of a Warrant,  but not later than 30 days
from the date of such  exercise,  the  Company  shall  issue and  deliver to the
Holder a certificate or  certificates  for the Warrant Shares issuable upon such
exercise,  in such  denomination or denominations and registered in such name or
names as the Holder shall have specified in the Purchase Form; provided, that if
a certificate or certificates  for Warrant Shares are to be registered in a name
or names other than the name of the  Holder,  and the  transfer of such  Warrant
Shares is not made pursuant to a registration statement under the Securities Act
of 1933,  as amended (the  "Securities  Act"),  the Holder shall  deliver to the
Company a legal  opinion  reasonably  satisfactory  to the Company to the effect
that such transfer is not required to be registered under the Securities Act. If
these  Warrants  should be  exercised  in part only,  the  Company  shall,  upon
surrender of these Warrants for  cancellation,  execute and deliver new Warrants
substantially in the form hereof  evidencing the rights of the Holder thereof to
purchase  the  balance of the Warrant  Shares  covered by these  Warrants.  Upon
receipt by the Company of these Warrants at its office, or by the stock transfer
agent of the Company at its office,  in proper form for exercise,  the Holder or
its designee  shall be deemed to be the holder of record of the shares of Common
Stock issuable upon such exercise, notwithstanding that the stock transfer books
of the  Company  shall  then be closed or that  certificates  representing  such
shares of Common Stock shall not then be  physically  delivered to the Holder or
its designee.



                                      -2-

<PAGE>
 
<PAGE>



                       b.  Payment for the Exercise  Price  tendered in Warrants
under  subparagraph  (a) above shall be by  presentation  and  surrender of such
Warrants,  and the Warrants so  delivered  shall be valued at an amount equal to
the product of (x) the number of Warrant  Shares  deliverable  upon  exercise of
such  Warrants  and (y) the  excess,  if any,  of (i) the average of the closing
price of the Common Stock on the principal exchange on which the Common Stock is
traded for the trading days  (during  which the Common  Stock  actually  traded)
during the 90-day period  preceding the date of exercise or, if the Common Stock
is not traded on an exchange,  the average  closing price of the Common Stock in
the over-the-counter  market for the trading days (during which the Common Stock
actually  traded)  during the 90-day period  preceding the date of exercise over
(ii) the Exercise Price.

                  2.  RESERVATION  OF  SHARES.  The  Company  shall at all times
reserve and keep  available,  free from preemptive  rights,  for issuance and/or
delivery  upon  exercise  of these  Warrants,  such number of shares of its duly
authorized  and  unissued  Common  Stock,  as shall be required for issuance and
delivery of Warrant  Shares upon exercise in full of all  outstanding  Warrants.
All shares of Common Stock which are so issuable shall, when issued, be duly and
validly issued, fully paid and non-assessable and free from all taxes, liens and
charges.

                  3.   FRACTIONAL   SHARES.   No  fractional   shares  or  scrip
representing  fractional  shares  shall be  issued  upon the  exercise  of these
Warrants. In lieu of issuing a fraction of a share, the number of Warrant Shares
to be received upon any exercise shall be rounded up to the next whole share.

                  4.  ASSIGNMENT  OR LOSS OF  WARRANT.  These  Warrants  are not
assignable  without the prior  written  consent of the Company,  except that the
Holder may assign these  Warrants,  in whole or in part, to any affiliate of the
Holder  without  the  consent of the  Company.  Further,  any  assignee  of such
Warrants  (except for  affiliates  of the Holder) shall provide the Company with
such investment  representations  as the Company may reasonably  request and the
Holder shall provide the Company with a legal opinion reasonably satisfactory to
the Company that such transfer may be effected  without  registration  under the
Securities  Act.  Subject to the Company's  consent and receipt of the foregoing
(if required),  upon surrender of these Warrants to the Company at its principal
office or at the office of its stock transfer  agent, if any, with an Assignment
Form reasonably  acceptable to the Company duly executed and funds sufficient to
pay any transfer tax, the Company  shall,  without charge to the assignor or the
assignee,  execute  and deliver a new Warrant or Warrants of like tenor as these
Warrants  in  the  name  or  names  of  the  assignee  or  assignees  and in the
denomination or  denominations  specified in such instrument of assignment,  and
these Warrants  shall  promptly be


                                      -3-


<PAGE>
 
<PAGE>

canceled. If less than all of these Warrants are being assigned, new Warrants of
like tenor as these  Warrants shall be issued and delivered to the Holder hereof
for the portion of these Warrants not being assigned.

                  Upon receipt by the Company of evidence  satisfactory to it of
the loss, theft,  destruction or mutilation of these Warrants,  and (in the case
of loss, theft or destruction) of reasonably satisfactory  indemnification,  and
upon surrender and  cancellation  of these Warrants,  if mutilated,  the Company
will execute and deliver new Warrants of like tenor and date  exercisable for an
equivalent number of shares of Common Stock.

                  5. RIGHTS OF THE HOLDER. The Holder shall not by virtue hereof
be entitled to any rights as a shareholder  of the Company,  either at law or in
equity,  and the  rights  of the  Holder  are  limited  to  those  expressed  or
incorporated  in these  Warrants  and are not  enforceable  against  the Company
except to the extent set forth or incorporated herein.

                  6. ANTI-DILUTION  PROVISIONS.  The Exercise Price in effect at
any time and the number and kind of securities  purchasable upon the exercise of
the Warrants shall be subject to adjustment from time to time upon the happening
of certain events, as follows:

                       a. In case the  Company  shall (i)  declare a dividend or
make a  distribution  on its  outstanding  shares of  Common  Stock in shares of
Common Stock,  (ii)  subdivide or reclassify  its  outstanding  shares of Common
Stock  into a greater  number of shares,  or (iii)  combine  or  reclassify  its
outstanding shares of Common Stock into a smaller number of shares, the Exercise
Price shall be adjusted,  effective  immediately  after the record date for such
dividend or distribution or the effective date of such subdivision,  combination
or reclassification,  to a price determined by multiplying the Exercise Price in
effect  immediately  prior to such record date or effective  date by a fraction,
the numerator of which shall be the number of shares of Common Stock outstanding
immediately  before giving effect to such dividend,  distribution,  subdivision,
combination  or  reclassification,  and the  denominator  of which  shall be the
number of  shares  of  Common  Stock  outstanding  after  giving  effect to such
dividend, distribution, subdivision, combination or reclassification.

                       b. Whenever the Exercise Price payable upon exercise of a
Warrant is adjusted  pursuant to subparagraph  (a) above,  the number of Warrant
Shares  purchasable upon exercise of a Warrant shall  simultaneously be adjusted
by multiplying the number of Warrant Shares purchasable immediately prior to any
adjustment by the Exercise Price in effect  immediately  prior to any adjustment
and dividing the product so obtained by the Exercise Price as adjusted.


                                      -4-

<PAGE>
 
<PAGE>

                       c. The  provisions of this paragraph 6 shall not apply to
(i) the issue,  sale,  distribution or grant of any shares of Common Stock,  any
rights,  warrants or options to subscribe for or purchase shares of Common Stock
or any securities convertible into or exchangeable for shares of Common Stock to
officers,  directors or employees of the Company pursuant to a compensation plan
that  currently  exists  and has been,  or in the  future may exist and will be,
approved by the  stockholders  of the Company or (ii) the  issuance of shares of
Common  Stock to  officers,  directors  or  employees  of the  Company  upon any
exercise  of rights,  warrants  or  options,  or any  conversion  or exchange of
convertible  or  exchangeable  securities,  described  in clause (i)  above.  No
adjustment to the Exercise Price shall be required unless such adjustment  would
require an increase  or  decrease  of at least five cents  ($.05) in such price;
provided, however, that any adjustments which by reason of this subparagraph (c)
are not  required to be made shall be carried  forward and taken into account in
any subsequent  adjustment made under this paragraph 6. All  calculations  under
this  paragraph  6  shall  be  made  to  the  nearest  cent  or to  the  nearest
one-hundredth  of a share,  as the case may be.  Anything in this paragraph 6 to
the contrary  notwithstanding,  the Company shall be entitled,  but shall not be
required, to reduce the Exercise Price, in addition to those required reductions
by this  paragraph  6, as it  shall  determine,  in its sole  discretion,  to be
advisable in order that any dividend or  distribution in shares of Common Stock,
or any subdivision,  reclassification or combination of Common Stock,  hereafter
made by the Company shall not result in any federal  income tax liability to the
holders of Common Stock or securities  convertible  into Common Stock (including
Warrants).

                       d.  Whenever  the  Exercise  Price is  adjusted as herein
provided,  the Company shall  promptly cause a notice setting forth the adjusted
Exercise Price and adjusted number of Warrant Shares issuable upon exercise of a
Warrant to be mailed to the Holder, at its last address appearing in the Warrant
Register (as hereinafter  defined),  and shall cause a certified copy thereof to
be mailed to the Company's  stock transfer agent, if any. The Company may retain
a  firm  of  nationally  recognized  independent  certified  public  accountants
selected by the Board of Directors (who may be the regular accountants  employed
by the  Company) to make any  computation  required by this  paragraph  6, and a
certificate signed by such firm shall be conclusive  evidence of the correctness
of such adjustment.

                       e. In the  event  that at any  time,  as a  result  of an
adjustment  made  pursuant to  subparagraph  (a) above,  the Holder of a Warrant
thereafter shall become entitled to receive any shares of the Company other than
Common  Stock,  thereafter  the number of such other shares so  receivable  upon
exercise  of a Warrant  shall be  subject to  adjustment  from time to time in a


                                      -5-

<PAGE>
 
<PAGE>

manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in subparagraph (a).

                       f.  Irrespective of any adjustments in the Exercise Price
or the number or kind of Warrant Shares  purchasable upon exercise of a Warrant,
Warrants issued in substitution or replacement of these Warrants may continue to
express  the same  Exercise  Price and number and kind of Warrant  Shares as are
stated in such substituted or replaced Warrants.

                       g. As a condition  precedent  to the taking of any action
which would  require an  adjustment  pursuant to this  paragraph  6, the Company
shall take any action  which may be  necessary  in order  that the  Company  may
thereafter validly and legally issue as fully paid and nonassessable all Warrant
Shares  which the Holder of these  Warrants  is  entitled  to  receive  upon the
exercise thereof.

                       h. In case of any  consolidation  or  merger to which the
Company is a party, other than a consolidation or merger in which the Company is
a continuing  corporation and which does not result in any  reclassification  or
conversion of, or change in, the outstanding shares of Common Stock, or any sale
or conveyance of the property of the Company as an entirety or  substantially as
an entirety (any such event being called a "Capital Reorganization") the Company
shall cause  effective  provisions  to be made so that the Holder shall have the
right  thereafter  by  exercising  these  Warrants  at any  time  prior to their
expiration,  to  receive  (in lieu of the  number  of  shares  of  Common  Stock
theretofore  deliverable)  cash in an amount per share of Common  Stock equal to
the excess,  if any, of (x) the fair market  value per share of Common  Stock of
the consideration  received in the Capital  Reorganization over (y) the Exercise
Price.

                  7.   REGISTRATION RIGHTS

                       a. Upon a written  request to register some or all of the
Warrant  Shares issued or issuable upon exercise of these  Warrants  pursuant to
the  Securities  Act from the holders  thereof,  the  Company  will use its best
efforts to register such Warrant Shares for resale by the holder thereof on Form
S-3 or any other  registration  form then available  ("S-3  Registration").  The
Company hereby agrees to use its best efforts to continue to qualify for the use
of Form S-3.

                       b. Each time the Company  shall  determine or be required
to proceed with the preparation and filing of a registration statement under the
Securities  Act in  connection  with the  proposed  public  offering  of  equity
securities of the Company,  the Company will give written  notice thereof to the
holders of the  Warrant  Shares.  Upon the written  request of any


                                      -6-


<PAGE>
 
<PAGE>

holder given  within 20 days after  receipt of any such notice from the Company,
the Company will, except as herein provided,  cause all Warrant Shares for which
such holder has so requested  registration,  to be included in such registration
statement,  provided that nothing  herein shall prevent the Company from, at any
time, withdrawing,  abandoning or delaying any registration that is not required
under (a) above, and provided further,  that the rights of any holder under this
subsection  shall not extend (i) to registrations on Form S-8, on Form S-4 or on
any other Form  which  would not permit by its terms  inclusion  of the  Warrant
Shares, and (ii) to any offering initiated by the Company for its own account if
the Company  determines in good faith,  upon  consultation with its underwriter,
that the inclusion of the Warrant Shares would  adversely  affect the success of
such  offering.  If any  registration  pursuant  to  this  subsection  shall  be
underwritten,  in whole or in part,  the Company  may  require  that the Warrant
Shares  requested for inclusion  pursuant to this  subsection be included in the
underwriting on the same terms and conditions as the securities  otherwise being
sold  through  the  underwriters.  If in the good faith  judgment  evidenced  in
writing of the  underwriter  of such public  offering  only a limited  number of
Warrant  Shares should be included in such public  offering,  or no such Warrant
Shares  should be  included,  the holders of the Warrant  Shares,  and all other
security  holders  with  contractual  registration  rights,  shall be limited to
registering  such  proportion  of their  respective  shares  as shall  equal the
proportion that the number of shares of selling security holders permitted to be
registered by the  underwriter in such offering bears to the total number of all
shares then held by all selling security holders desiring to participate in such
offering.

                       c. If and whenever one or more holders of these  Warrants
and any Warrant Shares have requested pursuant to the provisions of subparagraph
(a) or (b) above that the Company effect the  registration of all of the Warrant
Shares under the Securities Act, the Company will:

                            (1)  prepare  and file with the SEC at the  earliest
practicable  date the  appropriate  registration  statement with respect to such
Warrant  Shares  and use all  reasonable  efforts  to  cause  such  registration
statement to become  effective as soon as  practicable  thereafter and to remain
effective for such period as may be  reasonably  necessary to effect the sale of
the Warrant  Shares,  but in any event no longer than two years from the date of
issuance of the Warrant Shares;

                            (2)  prepare  and file with the SEC such  amendments
and supplements to such registration  statement and to the prospectus  contained
therein  as may be  reasonably  necessary  to keep such  registration  statement
effective  for such period set forth in  subparagraph  (1) above,  and to comply
with the provisions of the Securities Act with respect to the disposition of all


                                      -7-

<PAGE>
 
<PAGE>

securities  covered  by  such  registration  statement  during  such  period  in
accordance  with the intended  methods of disposition by the sellers thereof set
forth in such registration statement;

                            (3) use all  reasonable  efforts to (i)  register or
qualify  the  Warrant  Shares,   concurrently  with  the  effectiveness  of  the
registration   statement,   under  the  Blue  Sky  or  securities  laws  of  any
jurisdiction such holder thereof  reasonably  requests,  and (ii) do any and all
other acts and things which may be  reasonably  necessary or advisable to enable
such holders to consummate the disposition in such  jurisdictions of the Warrant
Shares in  compliance  with such laws;  provided,  that the Company  will not be
required to (x) qualify  generally to do business in any  jurisdiction  where it
would not  otherwise  be  required  to qualify  but for this  subparagraph,  (y)
subject itself to taxation in any  jurisdiction  in which it is not otherwise so
subject  or (z) file any  general  consent  to  service  of  process in any such
jurisdiction;

                            (4) furnish to the holders who  participate  in such
registration such number of copies of the registration statement, each amendment
and supplement  thereto,  the preliminary  prospectus,  the final prospectus and
such  other  documents  as such  holders  may  reasonably  request  in  order to
facilitate the public offering of such Warrant Shares;

                            (5)  notify  the  holders  who  participate  in such
registration,  promptly after it shall receive notice thereof,  of the time when
such  registration  statement  has  become  effective  or a  supplement  to  any
prospectus forming a part of such registration statement has been filed;

                            (6) notify  any seller or sellers of Warrant  Shares
covered by such registration  statement,  at any time when a prospectus relating
thereto covered by such registration statement is required to be delivered under
the  Securities  Act,  of the  happening  of any  event as a result of which the
prospectus included in such registration  statement, as then in effect, includes
an  untrue  statement  of a  material  fact or omits to  state a  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
the light of the circumstances then existing,  not misleading and at the request
of such  seller or  sellers,  prepare  and  furnish to such  seller or sellers a
reasonable  number  of  copies  of a  supplement  to or  an  amendment  of  such
prospectus  as  may  be  necessary  so  that,  as  thereafter  delivered  to the
purchasers of the Warrant Shares,  such  prospectus  shall not include an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the statements  therein, in the light of the
circumstances then existing, not misleading; and



                                      -8-


<PAGE>
 
<PAGE>


                            (7) at the  request  of any  holder or  holders  who
participate in such  registration,  on the date that the registration  statement
with respect to such Warrant Shares  becomes  effective,  (i) an opinion,  dated
such  date,  of  counsel  representing  the  Company  for  the  purpose  of such
registration,  in form and substance as is customarily  given to underwriters in
an underwritten public offering,  addressed to the holder or holders making such
request; and (ii) a letter dated such date, from a firm of nationally recognized
independent  certified public accountants which represents the Company,  in form
and  substance  as  is  customarily   given  by  independent   certified  public
accountants to underwriters in an underwritten public offering, addressed to the
holder or holders making such request.

                       d.  Notwithstanding  anything  contained  herein  to  the
contrary,  the Company  shall not be  obligated  to use its best efforts to have
more than two registration  statements  declared  effective under the Securities
Act pursuant to these Warrants.  Furthermore, the Company shall not be obligated
to file any registration statements prior to May 13, 1997.

                       e. With respect to a registration hereunder,  the Company
shall  bear  all  of  the  following  fees,  costs  and  expenses  (collectively
"Registration  Expenses"):  all  registration,  filing and NASD  fees,  printing
expenses,  fees and disbursements of counsel for the Company and all independent
accountants for the Company,  underwriters (excluding discounts and commissions)
and other persons retained by the Company, messenger and delivery fees, transfer
agent and registrar fees and expenses, and the expenses and fees for any listing
of the  securities to be registered on each  securities  exchange (or NASDAQ) on
which similar securities issued by the Company are then listed; and expenses and
fees incurred in connection with  registration or  qualification  of the Warrant
Shares under Blue Sky or securities laws of the  jurisdictions  specified by the
holders thereof pursuant to subparagraph (c)(3) above.

                       f. (1) The Company will  indemnify and hold harmless each
holder of Warrant  Shares  participating  in a  registration  pursuant  to these
provisions,  and each broker or any other person acting on behalf of such holder
and each person,  if any, who controls any of the foregoing  persons  within the
meaning of the Securities Act, from and against any and all loss, claim, damage,
liability,  cost or expense  to which any of the  foregoing  persons  may become
subject under the Securities Act or otherwise,  insofar as such losses,  claims,
damages, liabilities,  costs or expenses are caused by, are based upon, or arise
out of any untrue  statement or alleged  untrue  statement of any material  fact
contained in such registration  statement,  any prospectus  contained therein or
any amendment or supplement  thereto,  or any document  furnished or prepared by
the Company  incident to the registration or qualification of the Warrant Shares
pursuant  to this  paragraph


                                      -9-


<PAGE>
 
<PAGE>

7 or the omission or alleged  omission to state therein a material fact required
to be stated  therein or necessary to make the statements  therein,  in light of
the  circumstances in which they were made, not misleading,  or any violation by
the  Company  of the  Securities  Act or  state  securities  or  Blue  Sky  laws
applicable  to the Company or  relating  to action or  inaction  required of the
Company in connection with such  registration or qualification  under such state
securities or Blue Sky laws;  and shall  reimburse  such holder,  such broker or
other person acting on behalf of such holder and each controlling person for any
legal or any other  expenses  reasonably  incurred by any of them in  connection
with  investigating  or defending  any such loss,  claim,  damage,  liability or
action; provided,  however, that the Company will not be liable in any such case
to the extent  that any such loss,  claim,  damage,  liability,  cost or expense
arises out of or is based upon an untrue  statement or alleged untrue  statement
or  omission  or alleged  omission  so made in strict  conformity  with  written
information  furnished by such holder,  such broker, such other person acting on
behalf of such holder or such  controlling  person  specifically  for use in the
preparation of such documents.

                            (2)  Each  holder  participating  in a  registration
hereunder  will  indemnify  and hold  harmless  the Company,  and its  officers,
directors and each person,  if any, who controls the Company  within the meaning
of the  Securities  Act,  from and  against  any and all  loss,  claim,  damage,
liability,  cost or expense to which the  Company or such  officer,  director or
controlling  person may become  subject under the  Securities  Act or otherwise,
insofar as such  losses,  claims,  damages,  liabilities,  costs or expenses are
caused by any untrue  statement or alleged untrue statement of any material fact
contained in such registration  statement,  any prospectus  contained therein or
any amendment or supplement  thereto,  or any document  furnished or prepared by
the Company  incident to the registration or qualification of the Warrant Shares
pursuant to this  paragraph 7 or the  omission or the alleged  omission to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances in which they were made, not
misleading,  but only to the extent that such untrue statement or alleged untrue
statement or omission or alleged  omission  was so made in reliance  upon and in
strict conformity with written information furnished by such holder specifically
for use in the preparation of such documents.

                            (3) Each party  entitled  to  indemnification  under
this subparagraph (f) (the  "Indemnified  Party") shall give notice to the party
that allegedly is obligated  hereunder to indemnify the  Indemnified  Party (the
"Indemnifying Party") promptly after such Indemnified Party has actual knowledge
of any  claim  as to  which  indemnity  may be  sought,  and  shall  permit  the
Indemnifying  Party to assume the  defense  of any such claim or any  litigation
resulting therefrom; provided, however, that counsel


                                      -10


<PAGE>
 
<PAGE>

for the  Indemnifying  Party, who shall conduct the defense of such claim or any
litigation  resulting  therefrom,  shall be  approved by the  Indemnified  Party
(whose approval shall not unreasonably be withheld),  and the Indemnified  Party
may  participate in such defense at such party's expense (unless the Indemnified
Party  shall have been  advised by counsel  that actual or  potential  differing
interests or defenses exist or may exist between the Indemnifying  Party and the
Indemnified  Party, in which case such expense shall be paid by the Indemnifying
Party);  and provided further that the failure of any Indemnified  Party to give
notice as  provided  herein  shall not  relieve  the  Indemnifying  Party of its
obligations under this  subparagraph (f). No Indemnifying  Party, in the defense
of any  such  claim or  litigation,  shall,  except  with  the  consent  of each
Indemnified Party, consent to entry of any judgment or enter into any settlement
that  does not  include  as an  unconditional  term  thereof  the  giving by the
claimant or plaintiff to such Indemnified  Party of a release from all liability
in respect to such claim or litigation.

                       g.  Notwithstanding  anything to the  contrary  contained
herein,  the  holders  of  Warrant  Shares  shall  have no  registration  rights
hereunder  with respect to any proposed  sale of Warrant  Shares if an exemption
from  registration  pursuant to Rule 144 promulgated under the Securities Act is
available  for the offer and sale of all of the  Warrant  Shares  proposed to be
sold.

                  8.  CONDITION  PRECEDENT.  This  Warrant  is  subject  to  the
condition  precedent  that Nassau  and/or Green Field Capital  Management,  Inc.
and/or its designees  purchase,  in total,  ten percent  (approximately  165,000
shares) or more of the  outstanding  shares of the Company within 30 days of the
date of this Warrant.  If this condition precedent shall fail, then this Warrant
shall be void ab initio and of no force or effect.

                  9. MISCELLANEOUS

                  a. All notices and other communications provided for hereunder
shall be in writing (including  telegraphic,  telex or cable  communication) and
shall become  effective (i) when  personally  delivered on a business day during
normal  business  hours at the place of  receipt  to the party to be given  such
notice,  (ii) on the third  business day  following the day when  deposited,  if
mailed by certified or registered mail with return receipt requested and postage
thereon  fully  prepaid,  (iii)  on the  business  day  following  the day  when
deposited if sent by overnight courier,  fully prepaid,  or (iv) on the business
day such notice shall have been sent by telex,  telegram,  telecopier,  cable or
similar  electronic device,  fully prepaid.  The addresses for such notice shall
be:


                                      -11-



<PAGE>
 
<PAGE>


                  if to the Company, to:

                                    Barringer Laboratories, Inc.
                                    15000 West 6th Avenue, Suite 300
                                    Golden, CO 80401-5047
                                    Attention:  Mr. Robert H. Walker
                                                       President and CEO
or

                  if to the Holder, to:

                                    Mr. J. Francis Lavelle
                                    c/o The Nassau Group, Inc.
                                    18 Kings Highway
                                    Westport, Connecticut 06880
                                    Attention:  Mr. J. Francis Lavelle

or at such other address as any of the foregoing parties shall from time to time
designate in writing to the other party in accordance herewith.

                  b. No failure or delay of the Holder in exercising  any right,
power or privilege  hereunder shall operate as a waiver  thereof,  nor shall any
single or partial  exercise  thereof,  or any abandonment or  discontinuance  of
steps to enforce such a right,  power or  privilege,  preclude any other further
exercise  thereof or the exercise of any other right,  power or  privilege.  The
rights and remedies of the Holder are cumulative and not exclusive of any rights
or remedies which it would  otherwise have. The provisions of these Warrants may
be amended, modified or waived if, but only if, such amendment,  modification or
waiver is in writing and is signed by the Holders of a majority of the  Warrants
outstanding;  provided, that no amendment, modification or waiver may change the
Exercise Price or the number of Warrant Shares subject to purchase upon exercise
of each Warrant  (including without limitation any adjustments or any provisions
with respect to  adjustments  or the manner of exercise)  without the consent in
writing of all of the Holders of the Warrants outstanding.

                  c. All covenants,  agreements and provisions of these Warrants
by or for the benefit of the Company  shall bind and inure to the benefit of its
successors and assigns hereunder.

                  d.  THESE  WARRANTS  SHALL BE  GOVERNED  BY AND  CONSTRUED  IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.


                                      -12-


<PAGE>
 
<PAGE>


                  IN WITNESS WHEREOF,  Barringer  Laboratories,  Inc. has caused
this  Warrant to be  manually  executed  by its duly  authorized  President  and
attested by its duly authorized Secretary.


                  BARRINGER LABORATORIES, INC.



              By: /s/ Robert H. Walker
                  _______________________________
                  Robert H. Walker
                  President and CEO


Dated:  May 13, 1996

Attest:


/s/ Charles E. Ramsay
_______________________________________
Charles E. Ramsay
Assistant Secretary






                                      -13-


<PAGE>
 
<PAGE>


                                  PURCHASE FORM


                                                     Dated: ______________, ____


                  The  undersigned  hereby  irrevocably  elects to exercise  the
within  Warrants to the extent of  purchasing  _____  Warrant  Shares and hereby
tenders payment of the aggregate Exercise Price therefor by the following means:
_________________________________________.  Any cash payments to be made in lieu
of issuing  fractional  shares should be payable to the order of the undersigned
and delivered at the indicated address.


                     INSTRUCTIONS FOR REGISTRATION OF STOCK


Name____________________________________________________________________________
                  (Please typewrite or print in block letters)


Address ________________________________________________________________________


                  Signature __________________________________________

                  Address ____________________________________________







                                      -14-



<PAGE>
 










                                                                       Exhibit 5



           THESE  WARRANTS,  AND THE  SECURITIES  ISSUABLE  UPON EXERCISE
           HEREOF,  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF
           1933,  AS  AMENDED,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED  OR
           OTHERWISE  DISPOSED  OF  UNLESS  THE  SAME ARE  REGISTERED  IN
           ACCORDANCE  WITH  SAID  ACT,  OR  IT  IS  ESTABLISHED  TO  THE
           SATISFACTION  OF THE  COMPANY  THAT SUCH  REGISTRATION  IS NOT
           REQUIRED.


                 Void after 5:00 p.m., New York, New York Time,
                                 on May 13, 2001



                          WARRANTS FOR THE PURCHASE OF

             2,130 SHARES OF COMMON STOCK, $.01 PAR VALUE PER SHARE

                                       OF

                          BARRINGER LABORATORIES, INC.




                  This Is To Certify  That,  FOR VALUE  RECEIVED,  Mr. Thomas A.
Dippel,  or his  successors  and permitted  assigns  ("Holder"),  is entitled to
purchase,   subject  to  the  provisions  of  these  Warrants,   from  Barringer
Laboratories, Inc., a Delaware corporation ("Company"), Two Thousand One Hundred
Thirty (2,130) duly  authorized,  validly issued,  fully paid and  nonassessable
shares  of Common  Stock,  $.01 par value per  share,  of the  Company  ("Common
Stock"), at One Dollar and Six Cents ($1.06) per share, at any time or from time
to time during the period from May 13, 1996 to May 13, 2001,  but not later than
5:00  p.m.,  New York,  New York time on May 13,  2001.  The number of shares of
Common Stock which the Holder is entitled to purchase  upon the exercise of each
Warrant and the exercise  price to be paid for each share of Common Stock may be
adjusted from time to time as hereinafter set forth.  The shares of Common Stock
deliverable  upon such exercise,  as adjusted from time to time, are hereinafter
sometimes  referred to as "Warrant  Shares" and the  exercise  price for one (1)
Warrant  Share  in  effect  at any  time and as  adjusted  from  time to time is
hereinafter sometimes referred to as the "Exercise Price".


                                      -1-

<PAGE>
 
<PAGE>


                  1.       EXERCISE OF WARRANTS.

                  a. These  Warrants may be exercised in whole or in part at any
time or from time to time on or after May 13,  1996 and until May 13,  2001.  If
these  Warrants shall be exercised on any day on which banking  institutions  in
the State of New York are  authorized  or required  by law to close,  then these
Warrants shall be deemed exercised on the next succeeding day which shall not be
such a day. These Warrants may be exercised by presentation and surrender hereof
to the Company at its principal  office (or to the stock transfer agent, if any,
of the  Company at its  office),  with the  Purchase  Form  annexed  hereto duly
executed and  accompanied  by payment of the  aggregate  Exercise  Price for the
number of Warrant Shares specified in such Purchase Form. The aggregate Exercise
Price for such  Warrant  Shares  may be  tendered  to the  Company  in cash,  by
certified check or bank draft, by conversion of any indebtedness  outstanding at
such time of the Company to the  Holder,  if the Common  Stock is then  publicly
traded,  in  Warrants  (valued  for this  purpose  at their  fair  market  value
determined  as  provided  in  subparagraph  (b)  below),  or by any  combination
thereof.  Any  request  for  exercise  must be  accompanied  by such  investment
representations  as  are  reasonably  requested  by  the  Company.  As  soon  as
practicable  after each such  exercise of a Warrant,  but not later than 30 days
from the date of such  exercise,  the  Company  shall  issue and  deliver to the
Holder a certificate or  certificates  for the Warrant Shares issuable upon such
exercise,  in such  denomination or denominations and registered in such name or
names as the Holder shall have specified in the Purchase Form; provided, that if
a certificate or certificates  for Warrant Shares are to be registered in a name
or names other than the name of the  Holder,  and the  transfer of such  Warrant
Shares is not made pursuant to a registration statement under the Securities Act
of 1933,  as amended (the  "Securities  Act"),  the Holder shall  deliver to the
Company a legal  opinion  reasonably  satisfactory  to the Company to the effect
that such transfer is not required to be registered under the Securities Act. If
these  Warrants  should be  exercised  in part only,  the  Company  shall,  upon
surrender of these Warrants for  cancellation,  execute and deliver new Warrants
substantially in the form hereof  evidencing the rights of the Holder thereof to
purchase  the  balance of the Warrant  Shares  covered by these  Warrants.  Upon
receipt by the Company of these Warrants at its office, or by the stock transfer
agent of the Company at its office,  in proper form for exercise,  the Holder or
its designee  shall be deemed to be the holder of record of the shares of Common
Stock issuable upon such exercise, notwithstanding that the stock transfer books
of the  Company  shall  then be closed or that  certificates  representing  such
shares of Common Stock shall not then be  physically  delivered to the Holder or
its designee.


                                      -2-

<PAGE>
 
<PAGE>



                       b.  Payment for the Exercise  Price  tendered in Warrants
under  subparagraph  (a) above shall be by  presentation  and  surrender of such
Warrants,  and the Warrants so  delivered  shall be valued at an amount equal to
the product of (x) the number of Warrant  Shares  deliverable  upon  exercise of
such  Warrants  and (y) the  excess,  if any,  of (i) the average of the closing
price of the Common Stock on the principal exchange on which the Common Stock is
traded for the trading days  (during  which the Common  Stock  actually  traded)
during the 90-day period  preceding the date of exercise or, if the Common Stock
is not traded on an exchange,  the average  closing price of the Common Stock in
the over-the-counter  market for the trading days (during which the Common Stock
actually  traded)  during the 90-day period  preceding the date of exercise over
(ii) the Exercise Price.

                  2.  RESERVATION  OF  SHARES.  The  Company  shall at all times
reserve and keep  available,  free from preemptive  rights,  for issuance and/or
delivery  upon  exercise  of these  Warrants,  such number of shares of its duly
authorized  and  unissued  Common  Stock,  as shall be required for issuance and
delivery of Warrant  Shares upon exercise in full of all  outstanding  Warrants.
All shares of Common Stock which are so issuable shall, when issued, be duly and
validly issued, fully paid and non-assessable and free from all taxes, liens and
charges.

                  3.   FRACTIONAL   SHARES.   No  fractional   shares  or  scrip
representing  fractional  shares  shall be  issued  upon the  exercise  of these
Warrants. In lieu of issuing a fraction of a share, the number of Warrant Shares
to be received upon any exercise shall be rounded up to the next whole share.

                  4.  ASSIGNMENT  OR LOSS OF  WARRANT.  These  Warrants  are not
assignable  without the prior  written  consent of the Company,  except that the
Holder may assign these  Warrants,  in whole or in part, to any affiliate of the
Holder  without  the  consent of the  Company.  Further,  any  assignee  of such
Warrants  (except for  affiliates  of the Holder) shall provide the Company with
such investment  representations  as the Company may reasonably  request and the
Holder shall provide the Company with a legal opinion reasonably satisfactory to
the Company that such transfer may be effected  without  registration  under the
Securities  Act.  Subject to the Company's  consent and receipt of the foregoing
(if required),  upon surrender of these Warrants to the Company at its principal
office or at the office of its stock transfer  agent, if any, with an Assignment
Form reasonably  acceptable to the Company duly executed and funds sufficient to
pay any transfer tax, the Company  shall,  without charge to the assignor or the
assignee,  execute  and deliver a new Warrant or Warrants of like tenor as these
Warrants  in  the  name  or  names  of  the  assignee  or  assignees  and in the
denomination or  denominations  specified in such instrument of assignment,  and
these Warrants  shall  promptly be


                                      -3-


<PAGE>
 
<PAGE>

canceled. If less than all of these Warrants are being assigned, new Warrants of
like tenor as these  Warrants shall be issued and delivered to the Holder hereof
for the portion of these Warrants not being assigned.

                  Upon receipt by the Company of evidence  satisfactory to it of
the loss, theft,  destruction or mutilation of these Warrants,  and (in the case
of loss, theft or destruction) of reasonably satisfactory  indemnification,  and
upon surrender and  cancellation  of these Warrants,  if mutilated,  the Company
will execute and deliver new Warrants of like tenor and date  exercisable for an
equivalent number of shares of Common Stock.

                  5. RIGHTS OF THE HOLDER. The Holder shall not by virtue hereof
be entitled to any rights as a shareholder  of the Company,  either at law or in
equity,  and the  rights  of the  Holder  are  limited  to  those  expressed  or
incorporated  in these  Warrants  and are not  enforceable  against  the Company
except to the extent set forth or incorporated herein.

                  6. ANTI-DILUTION  PROVISIONS.  The Exercise Price in effect at
any time and the number and kind of securities  purchasable upon the exercise of
the Warrants shall be subject to adjustment from time to time upon the happening
of certain events, as follows:

                       a. In case the  Company  shall (i)  declare a dividend or
make a  distribution  on its  outstanding  shares of  Common  Stock in shares of
Common Stock,  (ii)  subdivide or reclassify  its  outstanding  shares of Common
Stock  into a greater  number of shares,  or (iii)  combine  or  reclassify  its
outstanding shares of Common Stock into a smaller number of shares, the Exercise
Price shall be adjusted,  effective  immediately  after the record date for such
dividend or distribution or the effective date of such subdivision,  combination
or reclassification,  to a price determined by multiplying the Exercise Price in
effect  immediately  prior to such record date or effective  date by a fraction,
the numerator of which shall be the number of shares of Common Stock outstanding
immediately  before giving effect to such dividend,  distribution,  subdivision,
combination  or  reclassification,  and the  denominator  of which  shall be the
number of  shares  of  Common  Stock  outstanding  after  giving  effect to such
dividend, distribution, subdivision, combination or reclassification.

                       b. Whenever the Exercise Price payable upon exercise of a
Warrant is adjusted  pursuant to subparagraph  (a) above,  the number of Warrant
Shares  purchasable upon exercise of a Warrant shall  simultaneously be adjusted
by multiplying the number of Warrant Shares purchasable immediately prior to any
adjustment by the Exercise Price in effect  immediately  prior to any adjustment
and dividing the product so obtained by the Exercise Price as adjusted.



                                      -4-

<PAGE>
 
<PAGE>

                       c. The  provisions of this paragraph 6 shall not apply to
(i) the issue,  sale,  distribution or grant of any shares of Common Stock,  any
rights,  warrants or options to subscribe for or purchase shares of Common Stock
or any securities convertible into or exchangeable for shares of Common Stock to
officers,  directors or employees of the Company pursuant to a compensation plan
that  currently  exists  and has been,  or in the  future may exist and will be,
approved by the  stockholders  of the Company or (ii) the  issuance of shares of
Common  Stock to  officers,  directors  or  employees  of the  Company  upon any
exercise  of rights,  warrants  or  options,  or any  conversion  or exchange of
convertible  or  exchangeable  securities,  described  in clause (i)  above.  No
adjustment to the Exercise Price shall be required unless such adjustment  would
require an increase  or  decrease  of at least five cents  ($.05) in such price;
provided, however, that any adjustments which by reason of this subparagraph (c)
are not  required to be made shall be carried  forward and taken into account in
any subsequent  adjustment made under this paragraph 6. All  calculations  under
this  paragraph  6  shall  be  made  to  the  nearest  cent  or to  the  nearest
one-hundredth  of a share,  as the case may be.  Anything in this paragraph 6 to
the contrary  notwithstanding,  the Company shall be entitled,  but shall not be
required, to reduce the Exercise Price, in addition to those required reductions
by this  paragraph  6, as it  shall  determine,  in its sole  discretion,  to be
advisable in order that any dividend or  distribution in shares of Common Stock,
or any subdivision,  reclassification or combination of Common Stock,  hereafter
made by the Company shall not result in any federal  income tax liability to the
holders of Common Stock or securities  convertible  into Common Stock (including
Warrants).

                       d.  Whenever  the  Exercise  Price is  adjusted as herein
provided,  the Company shall  promptly cause a notice setting forth the adjusted
Exercise Price and adjusted number of Warrant Shares issuable upon exercise of a
Warrant to be mailed to the Holder, at its last address appearing in the Warrant
Register (as hereinafter  defined),  and shall cause a certified copy thereof to
be mailed to the Company's  stock transfer agent, if any. The Company may retain
a  firm  of  nationally  recognized  independent  certified  public  accountants
selected by the Board of Directors (who may be the regular accountants  employed
by the  Company) to make any  computation  required by this  paragraph  6, and a
certificate signed by such firm shall be conclusive  evidence of the correctness
of such adjustment.

                       e. In the  event  that at any  time,  as a  result  of an
adjustment  made  pursuant to  subparagraph  (a) above,  the Holder of a Warrant
thereafter shall become entitled to receive any shares of the Company other than
Common  Stock,  thereafter  the number of such other shares so  receivable  upon
exercise  of a Warrant  shall be  subject to  adjustment  from time to time in a



                                      -5-


<PAGE>
 
<PAGE>

manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in subparagraph (a).

                       f.  Irrespective of any adjustments in the Exercise Price
or the number or kind of Warrant Shares  purchasable upon exercise of a Warrant,
Warrants issued in substitution or replacement of these Warrants may continue to
express  the same  Exercise  Price and number and kind of Warrant  Shares as are
stated in such substituted or replaced Warrants.

                       g. As a condition  precedent  to the taking of any action
which would  require an  adjustment  pursuant to this  paragraph  6, the Company
shall take any action  which may be  necessary  in order  that the  Company  may
thereafter validly and legally issue as fully paid and nonassessable all Warrant
Shares  which the Holder of these  Warrants  is  entitled  to  receive  upon the
exercise thereof.

                       h. In case of any  consolidation  or  merger to which the
Company is a party, other than a consolidation or merger in which the Company is
a continuing  corporation and which does not result in any  reclassification  or
conversion of, or change in, the outstanding shares of Common Stock, or any sale
or conveyance of the property of the Company as an entirety or  substantially as
an entirety (any such event being called a "Capital Reorganization") the Company
shall cause  effective  provisions  to be made so that the Holder shall have the
right  thereafter  by  exercising  these  Warrants  at any  time  prior to their
expiration,  to  receive  (in lieu of the  number  of  shares  of  Common  Stock
theretofore  deliverable)  cash in an amount per share of Common  Stock equal to
the excess,  if any, of (x) the fair market  value per share of Common  Stock of
the consideration  received in the Capital  Reorganization over (y) the Exercise
Price.

                  7.   REGISTRATION RIGHTS

                       a. Upon a written  request to register some or all of the
Warrant  Shares issued or issuable upon exercise of these  Warrants  pursuant to
the  Securities  Act from the holders  thereof,  the  Company  will use its best
efforts to register such Warrant Shares for resale by the holder thereof on Form
S-3 or any other  registration  form then available  ("S-3  Registration").  The
Company hereby agrees to use its best efforts to continue to qualify for the use
of Form S-3.

                       b. Each time the Company  shall  determine or be required
to proceed with the preparation and filing of a registration statement under the
Securities  Act in  connection  with the  proposed  public  offering  of  equity
securities of the Company,  the Company will give written  notice thereof to the
holders of the  Warrant  Shares.  Upon the written  request of any


                                      -6-


<PAGE>
 
<PAGE>

holder given  within 20 days after  receipt of any such notice from the Company,
the Company will, except as herein provided,  cause all Warrant Shares for which
such holder has so requested  registration,  to be included in such registration
statement,  provided that nothing  herein shall prevent the Company from, at any
time, withdrawing,  abandoning or delaying any registration that is not required
under (a) above, and provided further,  that the rights of any holder under this
subsection  shall not extend (i) to registrations on Form S-8, on Form S-4 or on
any other Form  which  would not permit by its terms  inclusion  of the  Warrant
Shares, and (ii) to any offering initiated by the Company for its own account if
the Company  determines in good faith,  upon  consultation with its underwriter,
that the inclusion of the Warrant Shares would  adversely  affect the success of
such  offering.  If any  registration  pursuant  to  this  subsection  shall  be
underwritten,  in whole or in part,  the Company  may  require  that the Warrant
Shares  requested for inclusion  pursuant to this  subsection be included in the
underwriting on the same terms and conditions as the securities  otherwise being
sold  through  the  underwriters.  If in the good faith  judgment  evidenced  in
writing of the  underwriter  of such public  offering  only a limited  number of
Warrant  Shares should be included in such public  offering,  or no such Warrant
Shares  should be  included,  the holders of the Warrant  Shares,  and all other
security  holders  with  contractual  registration  rights,  shall be limited to
registering  such  proportion  of their  respective  shares  as shall  equal the
proportion that the number of shares of selling security holders permitted to be
registered by the  underwriter in such offering bears to the total number of all
shares then held by all selling security holders desiring to participate in such
offering.

                       c. If and whenever one or more holders of these  Warrants
and any Warrant Shares have requested pursuant to the provisions of subparagraph
(a) or (b) above that the Company effect the  registration of all of the Warrant
Shares under the Securities Act, the Company will:

                            (1)  prepare  and file with the SEC at the  earliest
practicable  date the  appropriate  registration  statement with respect to such
Warrant  Shares  and use all  reasonable  efforts  to  cause  such  registration
statement to become  effective as soon as  practicable  thereafter and to remain
effective for such period as may be  reasonably  necessary to effect the sale of
the Warrant  Shares,  but in any event no longer than two years from the date of
issuance of the Warrant Shares;

                            (2)  prepare  and file with the SEC such  amendments
and supplements to such registration  statement and to the prospectus  contained
therein  as may be  reasonably  necessary  to keep such  registration  statement
effective  for such period set forth in  subparagraph  (1) above,  and to comply
with the provisions of the Securities Act with respect to the disposition of all


                                      -7-

<PAGE>
 
<PAGE>

securities  covered  by  such  registration  statement  during  such  period  in
accordance  with the intended  methods of disposition by the sellers thereof set
forth in such registration statement;

                            (3) use all  reasonable  efforts to (i)  register or
qualify  the  Warrant  Shares,   concurrently  with  the  effectiveness  of  the
registration   statement,   under  the  Blue  Sky  or  securities  laws  of  any
jurisdiction such holder thereof  reasonably  requests,  and (ii) do any and all
other acts and things which may be  reasonably  necessary or advisable to enable
such holders to consummate the disposition in such  jurisdictions of the Warrant
Shares in  compliance  with such laws;  provided,  that the Company  will not be
required to (x) qualify  generally to do business in any  jurisdiction  where it
would not  otherwise  be  required  to qualify  but for this  subparagraph,  (y)
subject itself to taxation in any  jurisdiction  in which it is not otherwise so
subject  or (z) file any  general  consent  to  service  of  process in any such
jurisdiction;

                            (4) furnish to the holders who  participate  in such
registration such number of copies of the registration statement, each amendment
and supplement  thereto,  the preliminary  prospectus,  the final prospectus and
such  other  documents  as such  holders  may  reasonably  request  in  order to
facilitate the public offering of such Warrant Shares;

                            (5)  notify  the  holders  who  participate  in such
registration,  promptly after it shall receive notice thereof,  of the time when
such  registration  statement  has  become  effective  or a  supplement  to  any
prospectus forming a part of such registration statement has been filed;

                            (6) notify  any seller or sellers of Warrant  Shares
covered by such registration  statement,  at any time when a prospectus relating
thereto covered by such registration statement is required to be delivered under
the  Securities  Act,  of the  happening  of any  event as a result of which the
prospectus included in such registration  statement, as then in effect, includes
an  untrue  statement  of a  material  fact or omits to  state a  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
the light of the circumstances then existing,  not misleading and at the request
of such  seller or  sellers,  prepare  and  furnish to such  seller or sellers a
reasonable  number  of  copies  of a  supplement  to or  an  amendment  of  such
prospectus  as  may  be  necessary  so  that,  as  thereafter  delivered  to the
purchasers of the Warrant Shares,  such  prospectus  shall not include an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the statements  therein, in the light of the
circumstances then existing, not misleading; and



                                      -8-


<PAGE>
 
<PAGE>


                            (7) at the  request  of any  holder or  holders  who
participate in such  registration,  on the date that the registration  statement
with respect to such Warrant Shares  becomes  effective,  (i) an opinion,  dated
such  date,  of  counsel  representing  the  Company  for  the  purpose  of such
registration,  in form and substance as is customarily  given to underwriters in
an underwritten public offering,  addressed to the holder or holders making such
request; and (ii) a letter dated such date, from a firm of nationally recognized
independent  certified public accountants which represents the Company,  in form
and  substance  as  is  customarily   given  by  independent   certified  public
accountants to underwriters in an underwritten public offering, addressed to the
holder or holders making such request.

                       d.  Notwithstanding  anything  contained  herein  to  the
contrary,  the Company  shall not be  obligated  to use its best efforts to have
more than two registration  statements  declared  effective under the Securities
Act pursuant to these Warrants.  Furthermore, the Company shall not be obligated
to file any registration statements prior to May 13, 1997.

                       e. With respect to a registration hereunder,  the Company
shall  bear  all  of  the  following  fees,  costs  and  expenses  (collectively
"Registration  Expenses"):  all  registration,  filing and NASD  fees,  printing
expenses,  fees and disbursements of counsel for the Company and all independent
accountants for the Company,  underwriters (excluding discounts and commissions)
and other persons retained by the Company, messenger and delivery fees, transfer
agent and registrar fees and expenses, and the expenses and fees for any listing
of the  securities to be registered on each  securities  exchange (or NASDAQ) on
which similar securities issued by the Company are then listed; and expenses and
fees incurred in connection with  registration or  qualification  of the Warrant
Shares under Blue Sky or securities laws of the  jurisdictions  specified by the
holders thereof pursuant to subparagraph (c)(3) above.

                       f. (1) The Company will  indemnify and hold harmless each
holder of Warrant  Shares  participating  in a  registration  pursuant  to these
provisions,  and each broker or any other person acting on behalf of such holder
and each person,  if any, who controls any of the foregoing  persons  within the
meaning of the Securities Act, from and against any and all loss, claim, damage,
liability,  cost or expense  to which any of the  foregoing  persons  may become
subject under the Securities Act or otherwise,  insofar as such losses,  claims,
damages, liabilities,  costs or expenses are caused by, are based upon, or arise
out of any untrue  statement or alleged  untrue  statement of any material  fact
contained in such registration  statement,  any prospectus  contained therein or
any amendment or supplement  thereto,  or any document  furnished or prepared by
the Company  incident to the registration or qualification of the Warrant Shares
pursuant  to this  paragraph


                                      -9-


<PAGE>
 
<PAGE>

7 or the omission or alleged  omission to state therein a material fact required
to be stated  therein or necessary to make the statements  therein,  in light of
the  circumstances in which they were made, not misleading,  or any violation by
the  Company  of the  Securities  Act or  state  securities  or  Blue  Sky  laws
applicable  to the Company or  relating  to action or  inaction  required of the
Company in connection with such  registration or qualification  under such state
securities or Blue Sky laws;  and shall  reimburse  such holder,  such broker or
other person acting on behalf of such holder and each controlling person for any
legal or any other  expenses  reasonably  incurred by any of them in  connection
with  investigating  or defending  any such loss,  claim,  damage,  liability or
action; provided,  however, that the Company will not be liable in any such case
to the extent  that any such loss,  claim,  damage,  liability,  cost or expense
arises out of or is based upon an untrue  statement or alleged untrue  statement
or  omission  or alleged  omission  so made in strict  conformity  with  written
information  furnished by such holder,  such broker, such other person acting on
behalf of such holder or such  controlling  person  specifically  for use in the
preparation of such documents.

                            (2)  Each  holder  participating  in a  registration
hereunder  will  indemnify  and hold  harmless  the Company,  and its  officers,
directors and each person,  if any, who controls the Company  within the meaning
of the  Securities  Act,  from and  against  any and all  loss,  claim,  damage,
liability,  cost or expense to which the  Company or such  officer,  director or
controlling  person may become  subject under the  Securities  Act or otherwise,
insofar as such  losses,  claims,  damages,  liabilities,  costs or expenses are
caused by any untrue  statement or alleged untrue statement of any material fact
contained in such registration  statement,  any prospectus  contained therein or
any amendment or supplement  thereto,  or any document  furnished or prepared by
the Company  incident to the registration or qualification of the Warrant Shares
pursuant to this  paragraph 7 or the  omission or the alleged  omission to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances in which they were made, not
misleading,  but only to the extent that such untrue statement or alleged untrue
statement or omission or alleged  omission  was so made in reliance  upon and in
strict conformity with written information furnished by such holder specifically
for use in the preparation of such documents.

                            (3) Each party  entitled  to  indemnification  under
this subparagraph (f) (the  "Indemnified  Party") shall give notice to the party
that allegedly is obligated  hereunder to indemnify the  Indemnified  Party (the
"Indemnifying Party") promptly after such Indemnified Party has actual knowledge
of any  claim  as to  which  indemnity  may be  sought,  and  shall  permit  the
Indemnifying  Party to assume the  defense  of any such claim or any  litigation
resulting therefrom; provided, however, that counsel


                                      -10-


<PAGE>
 
<PAGE>

for the  Indemnifying  Party, who shall conduct the defense of such claim or any
litigation  resulting  therefrom,  shall be  approved by the  Indemnified  Party
(whose approval shall not unreasonably be withheld),  and the Indemnified  Party
may  participate in such defense at such party's expense (unless the Indemnified
Party  shall have been  advised by counsel  that actual or  potential  differing
interests or defenses exist or may exist between the Indemnifying  Party and the
Indemnified  Party, in which case such expense shall be paid by the Indemnifying
Party);  and provided further that the failure of any Indemnified  Party to give
notice as  provided  herein  shall not  relieve  the  Indemnifying  Party of its
obligations under this  subparagraph (f). No Indemnifying  Party, in the defense
of any  such  claim or  litigation,  shall,  except  with  the  consent  of each
Indemnified Party, consent to entry of any judgment or enter into any settlement
that  does not  include  as an  unconditional  term  thereof  the  giving by the
claimant or plaintiff to such Indemnified  Party of a release from all liability
in respect to such claim or litigation.

                       g.  Notwithstanding  anything to the  contrary  contained
herein,  the  holders  of  Warrant  Shares  shall  have no  registration  rights
hereunder  with respect to any proposed  sale of Warrant  Shares if an exemption
from  registration  pursuant to Rule 144 promulgated under the Securities Act is
available  for the offer and sale of all of the  Warrant  Shares  proposed to be
sold.

                  8.  CONDITION  PRECEDENT.  This  Warrant  is  subject  to  the
condition  precedent  that Nassau  and/or Green Field Capital  Management,  Inc.
and/or its designees  purchase,  in total,  ten percent  (approximately  165,000
shares) or more of the  outstanding  shares of the Company within 30 days of the
date of this Warrant.  If this condition precedent shall fail, then this Warrant
shall be void ab initio and of no force or effect.

                  9. MISCELLANEOUS

                  a. All notices and other communications provided for hereunder
shall be in writing (including  telegraphic,  telex or cable  communication) and
shall become  effective (i) when  personally  delivered on a business day during
normal  business  hours at the place of  receipt  to the party to be given  such
notice,  (ii) on the third  business day  following the day when  deposited,  if
mailed by certified or registered mail with return receipt requested and postage
thereon  fully  prepaid,  (iii)  on the  business  day  following  the day  when
deposited if sent by overnight courier,  fully prepaid,  or (iv) on the business
day such notice shall have been sent by telex,  telegram,  telecopier,  cable or
similar  electronic device,  fully prepaid.  The addresses for such notice shall
be:



                                      -11-

<PAGE>
 
<PAGE>


                  if to the Company, to:

                                    Barringer Laboratories, Inc.
                                    15000 West 6th Avenue, Suite 300
                                    Golden, CO 80401-5047
                                    Attention:  Mr. Robert H. Walker
                                                       President and CEO
or

                  if to the Holder, to:

                                    Mr. Thomas A. Dippel
                                    c/o The Nassau Group, Inc.
                                    18 Kings Highway
                                    Westport, Connecticut 06880
                                    Attention:  Mr. Thomas A. Dippel

or at such other address as any of the foregoing parties shall from time to time
designate in writing to the other party in accordance herewith.

                  b. No failure or delay of the Holder in exercising  any right,
power or privilege  hereunder shall operate as a waiver  thereof,  nor shall any
single or partial  exercise  thereof,  or any abandonment or  discontinuance  of
steps to enforce such a right,  power or  privilege,  preclude any other further
exercise  thereof or the exercise of any other right,  power or  privilege.  The
rights and remedies of the Holder are cumulative and not exclusive of any rights
or remedies which it would  otherwise have. The provisions of these Warrants may
be amended, modified or waived if, but only if, such amendment,  modification or
waiver is in writing and is signed by the Holders of a majority of the  Warrants
outstanding;  provided, that no amendment, modification or waiver may change the
Exercise Price or the number of Warrant Shares subject to purchase upon exercise
of each Warrant  (including without limitation any adjustments or any provisions
with respect to  adjustments  or the manner of exercise)  without the consent in
writing of all of the Holders of the Warrants outstanding.

                  c. All covenants,  agreements and provisions of these Warrants
by or for the benefit of the Company  shall bind and inure to the benefit of its
successors and assigns hereunder.

                  d.  THESE  WARRANTS  SHALL BE  GOVERNED  BY AND  CONSTRUED  IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.



                                      -12-

<PAGE>
 
<PAGE>


                  IN WITNESS WHEREOF,  Barringer  Laboratories,  Inc. has caused
this  Warrant to be  manually  executed  by its duly  authorized  President  and
attested by its duly authorized Secretary.


                  BARRINGER LABORATORIES, INC.



              By: /s/ Robert H. Walker
                 ________________________________
                 Robert H. Walker
                 President and CEO


Dated:  May 13, 1996

Attest:


/s/ Charles E. Ramsay
_______________________________________
Charles E. Ramsay
Assistant Secretary





                                      -13-


<PAGE>
 
<PAGE>


                                  PURCHASE FORM


                                                     Dated: ______________, ____


                  The  undersigned  hereby  irrevocably  elects to exercise  the
within  Warrants to the extent of  purchasing  _____  Warrant  Shares and hereby
tenders payment of the aggregate Exercise Price therefor by the following means:
_________________________________________.  Any cash payments to be made in lieu
of issuing  fractional  shares should be payable to the order of the undersigned
and delivered at the indicated address.


                     INSTRUCTIONS FOR REGISTRATION OF STOCK



Name____________________________________________________________________________
                  (Please typewrite or print in block letters)


Address ________________________________________________________________________


                  Signature __________________________________________

                  Address ____________________________________________







                                      -14-



<PAGE>
 







                                                                       Exhibit 6







CONFIDENTIAL

                                                                    May 13, 1996

Barringer Laboratories, Inc.
15000 West 6th Avenue
Suite 300
Golden, Colorado  80401-5047

Attn.:   Mr. Robert H. Walker
______________________________
         President

Dear Bob:

         This confirms that Barringer Laboratories, Inc. (together with its
subsidiaries and affiliates, the "Company") has engaged The Nassau Group, Inc.
(together with its subsidiaries and affiliates, "Nassau") to act, except as
provided below, as its exclusive financial advisor and consultant with regard to
such transactions, acquisitions, joint ventures, mergers and other similar
activities. The parties acknowledge that agents and/or affiliates and principals
of Nassau may from time to time act as directors of the Company and agree that
nothing in this Agreement shall be construed to entitle Nassau to compensation
hereunder for services provided by such directors acting in such capacity.
Moreover, the parties acknowledge that the Company has retained TechKNOWLEDGEy
Strategic Group ("TSG") to provide services to the Company which may include
services to be provided hereunder. The parties agree that the Company's use of
TSG to perform such services shall not constitute a breach of this Agreement.

         The engagement shall commence immediately and shall terminate on the
later of (a) June 1, 1998 or (b) 60 days after written notification of
termination by either party after the latest date specified below:

              If Nassau advises on a consummated Transaction (as defined below)
              during the two years prior to June 1, 1998, then the engagement
              shall automatically be extended to June 1, 1999.

              If Nassau advises on a consummated Transaction between June 1,
              1998 and May 31, 1999, then the engagement shall automatically be
              extended to June 1, 2000.

              If Nassau advises on a consummated Transaction between June 1,
              1999 and May 31, 2000, then the engagement shall automatically be
              extended to June 1, 2001.



<PAGE>
 
<PAGE>


Barringer Laboratories, Inc.
May 13, 1996
page 2

         Notwithstanding anything to the contrary to the foregoing, this
engagement may be terminated:

         (a)   On mutual agreement of the parties;

         (b)   By the Company, on thirty days written notice given at any time
               after either J. Francis Lavelle or John Holmes cease to provide
               services to Nassau; or

         (c)   At any time, by the Company, for cause.

Cause shall include, but not be limited to, (i) dishonesty, (ii) willful
misfeasance or nonfeasance of duty intended to injure or having the effect of
injuring the reputation, business or business relationships of he Company or any
of its subsidiaries or any of their respective officers, directors, or
employees, (iii) the filing against either of J. Francis Lavelle or John Holmes
of any complaint alleging his commission of any crime involving moral turpitude
or which could reflect unfavorably upon the Company or any of its subsidiaries;
or (iv) the failure, neglect or refusal by Nassau to diligently perform the
duties and responsibilities undertaken pursuant to the terms of this Agreement.

         Furthermore, during the term of this Agreement, the Company hereby
grants Nassau, on a case by case basis, the right of first refusal to provide
assistance on Capital Raising Transactions (as defined below) to the Company.
This right of first refusal shall mean that if the Company decides to raise debt
or equity capital in a Capital Raising Transaction pursuant to certain terms,
Nassau shall have the right to accept and advise on that assignment at those
terms. In the case that Nassau chooses not to accept such an assignment within
10 days of the Company's Board of Directors' decision, the Company shall be free
to select and hire another financial advisor or underwriter to assist it with
respect to that specific Capital Raising Transaction.

         1. Services. Nassau agrees to provide the Company with the following
services concerning its expansion into areas beyond the normal course of the
Company's current business activities:

         (a)  advisory services, including general business and financial
              analysis, corporate strategy development, transaction feasibility
              analysis and valuation analysis;

         (b)  assistance in the development of strategic priorities and
              transaction criteria and identification of prospective candidates
              which satisfy those criteria;

         (c)  assistance in negotiations, transaction structuring and related
              strategy; and

         (d)  assistance in corporate capital planning, including the
              identification of available financing.


<PAGE>
 
<PAGE>
Barringer Laboratories, Inc.
May 13, 1996
page 3

         2. Fees. Nassau shall be entitled to fees as follows (subject to
         reduction for consideration paid to TSG, as described below).

         Merger, Acquisition, Joint Venture, etc. Transaction

         If the Company enters into an M&A Transaction (as defined below) at any
time during Nassau's engagement hereunder or, in cases in which the transaction
has been identified by Nassau to the Company or concerning which Nassau has
performed advisory services hereunder, during the 18 month period after the
termination of Nassau's engagement hereunder, the Company shall pay, or shall
cause to be paid, to Nassau, subject to amounts paid to TSG, a transaction fee
(the "M&A Transaction Fee") calculated according to the following schedule:

<TABLE>
<CAPTION>

                                                       Percentage to be Applied to Portion
           Consideration in Transaction                of Consideration in Transaction
           ----------------------------                -------------------------------
      <S>                                                 <C> 
           Up to $1 million                                        5.0%, plus
           Over $1 million up to $2 million                        4.0%, plus
           Over $2 million up to $3 million                        3.0%, plus
           Over $3 million up to $4 million                        2.0%, plus
           Over $4 million                                         1.0%

</TABLE>

         Capital Raising Transaction

         Subject to the right of first refusal described above and in cases when
the Company has retained Nassau without a right of first refusal, then in cases
in which the transaction has been identified by Nassau to the Company or
concerning which Nassau has performed advisory services hereunder, if the
Company enters into a Capital Raising Transaction (as defined below) at any time
during Nassau's engagement hereunder or during the 18 month period after
termination of Nassau's engagement hereunder, the Company shall pay, or cause to
be paid, to Nassau a transaction fee immediately upon closing of the Capital
Raising Transaction (the "Capital Raising Transaction Fee"), calculated
according to the following terms:

<TABLE>
<CAPTION>

                                                            Percent of
         Type of Capital Raising Transaction              Consideration
         -----------------------------------              -------------
<S>                                                           <C> 
         Equity Capital (as defined below):                   5.0%
         Debt Capital (as defined below):                     2.0%

</TABLE>

         In the case of an M&A Transaction Fee or Capital Raising Transaction
Fee, Nassau and the Company, on a transaction by transaction basis, will
mutually agree on an allocation of the payment of the transaction fee among
cash, stock and/or warrant payments. In the event the parties cannot agree on an
allocation of the payment prior to consummation of a transaction, the M&A
Transaction Fee or Capital Raising



<PAGE>
 
<PAGE>

Barringer Laboratories, Inc.
May 13, 1996
page 4


Transaction Fee shall be payable in full in cash and, if the Company is to
receive Consideration on consummation of the M&A Transaction, then the same
shall be due and payable as the Company receives the Consideration. To the
extent the Consideration in respect thereof may be increased by contingent
payments, the portion of Nassau's fees relating thereto shall be calculated and
paid as and when such contingent payments are made. The M&A Transaction Fee
shall not be less than $25,000 for any consummated transaction.

         "Transaction" means an M&A Transaction or Capital Raising Transaction
(the latter as to which Nassau has been engaged), each as defined below.


         "M&A Transaction" means any transaction (or series of transactions)
(other than a Capital Raising Transaction) which, directly or indirectly,
results in (i) the acquisition by the Company of all or any part of the capital
stock of a third party or all or any part of the assets of such third party (or
any securities convertible into or exchangeable for or other rights to acquire
all or any part of such capital stock or assets), or (ii) the acquisition by a
third party of all or more than 50% of the capital stock of the Company or all
or substantially all of the assets of the Company or any division or subsidiary
of the Company (including any securities convertible into or exchangeable for or
other rights to acquire all or any part of such capital stock or assets),
including in each such case, without limitation, (a) any such sale or exchange
of capital stock or assets (including cash and other liquid assets), (b) any
rights or options to purchase or sell such capital stock or assets, (c) any
merger or consolidation (including any such transaction in which the third party
is the surviving Company), or (d) the formation of any joint venture or
partnership or any similar transaction; or (iii) the lending of debt capital by
the Company to a third party. With respect to (ii)(d), to be an M&A Transaction,
there must be a Capitalization equal to or exceeding $500,000. Capitalization
shall be defined to mean the total of all assets in the joint venture or
partnership or similar entity contributed by the parties at the time of closing
or within 12 months of closing.

         "Capital Raising Transaction" means any transaction (or series of
transactions) (other than an M&A Transaction) which results in the sale of
capital stock of the Company to a third party in exchange for Equity Capital, or
which results in the Company receiving Debt Capital from a third party in
exchange for a repayment obligation from the Company. For purposes of this
definition, the Capital Raising Transaction shall include in each such case,
without limitation, any sale or exchange of capital stock, any rights or options
to purchase or sell capital stock, the issuance of any debt obligation by the
Company or the formation of any joint venture or partnership or any similar
transaction, in each case structured for the purpose of raising Debt or Equity
Capital in the Company or for the purpose of recapitalizing the Company's
current capital structure.

         "Consideration" in an M&A Transaction means, with respect to such
Transaction, the total amount paid or payable (whether in cash, securities or
other property), directly or indirectly, upon the consummation of or otherwise
in connection



<PAGE>
 
<PAGE>

Barringer Laboratories, Inc.
May 13, 1996
page 5


with such Transaction, together with (i) all amounts paid or payable in
cancellation of stock options or other rights, (ii) the aggregate principal
amount of long-term indebtedness of the acquired company that, as a result of
such Transaction, becomes indebtedness of the acquiring company and (iii) the
aggregate redemption price or liquidation preference of any preferred stock of
the acquired company that, as a result of such Transaction, is redeemed or
becomes preferred stock of the acquiring company, as the case may be. For
purposes of this definition, long-term indebtedness shall be determined both as
to classification and amount on a consolidated basis for the entities acquired
or sold by the Company in accordance with generally accepted accounting
principles. In the event that the Consideration received in a Transaction is
paid or payable in whole or in part in the form of securities or other property,
the value of such securities or other property for purposes of calculating the
Consideration for such Transaction shall be the fair market value thereof, as
the parties hereto shall mutually agree, on the day prior to the consummation of
the Transaction.

         With respect to a Capital Raising Transaction, "Consideration" shall be
defined to include the total amount paid or payable (whether in cash, securities
or other property), directly or indirectly, upon the consummation of or
otherwise in connection with such Capital Raising Transaction. In the event that
the Consideration received in a Transaction is paid or payable in whole or in
part in the form of securities or other property, the value of such securities
or other property for purposes of calculating the Consideration for such
Transaction shall be the fair market value thereof, as the parties hereto shall
mutually agree, on the day prior to the consummation of the Transaction. Such
Consideration includes any amounts pledged to be paid to the Company in tranches
subsequent to that capital initially made available to the Company upon closing
of the Capital Raising Transaction.

         "Equity Capital" shall be defined as any capital investment into the
Company by a third party in exchange for any class of capital stock of the
Company (i.e. common stock, preferred stock or preferred stock which is
convertible into common stock at either the Company's or the third party's
option) for which the Company has no obligation of repayment to the third party,
excluding any interest or dividend payments or liquidation preferences which may
be included as rights for certain classes of stock.

         "Debt Capital" shall be defined as any capital investment into the
Company by a third party in exchange for an obligation by the Company to repay
such investment to the third party according to terms agreed upon by the
parties, including any interest or dividend payments which may be associated
with certain types of debt instruments. This obligation may be defined as either
senior to or subordinate to any other issues of debt included in the Company's
capital structure at the time of issuance of the Debt Capital or any other
issues of debt raised by the Company in the future. The Debt Capital may also be
structured as an instrument which is convertible into Equity Capital at any time
in the future at either party's election. For purposes of the calculation of the
Capital Raising Transaction Fee, such a convertible instrument shall be treated
as Debt Capital until the date of conversion at which time it will be considered
to be Equity Capital. Upon conversion, the Company shall pay, or cause to be
paid, to



<PAGE>
 
<PAGE>

Barringer Laboratories, Inc.
May 13, 1996
page 6


Nassau the balance of the Capital Raising Transaction Fee even if such
conversion takes place after the termination of Nassau's engagement.

         In the event that the Capital Raising Transaction is structured as a
combination of Equity Capital and Debt Capital, the above fee schedule shall be
applied to each portion of the transaction as if each portion were considered a
separate Capital Raising Transaction. For example, if $5 million were raised as
$3 million Debt Capital and $2 million Equity Capital, then the Capital Raising
Transaction Fee shall be $160,000, i.e. 2.0% on $3 million and 5.0% on $2
million.

         In the event that the Capital Raising Transaction includes an issuance
of warrants, options or other rights to invest additional Equity or Debt Capital
in the Company, in addition to the Capital Raising Transaction Fee relating to
such Capital Raising Transaction, the Company shall be obligated to issue to
Nassau as an additional fee substantially similar rights in an amount equal to
5% of such rights. Upon the exercise of the third party's issuance of warrants,
options or other rights to invest additional Equity or Debt Capital in the
Company, Nassau shall receive a Capital Raising Transaction Fee according to the
fee schedule outlined above even if such Transaction takes place after the
termination of Nassau's engagement.

         In the event TSG is under contract to the Company to provide advisory
services at the time of an M&A Transaction and provides consulting advisory
services to the Company in connection with an M&A Transaction, the total amount
of all consulting and transaction fees payable by the Company to Nassau
hereunder and to TSG will be allocated between Nassau and TSG on a 80%
(Nassau)/20% (TSG) basis. The Company agrees that in such a situation, the
Company shall pay any compensation due TSG directly to TSG and any compensation
due Nassau directly to Nassau. The Company will provide Nassau with prompt
notice of any involvement of TSG.

         3. Expenses. Whether or not a Transaction occurs, the Company shall
reimburse Nassau for its reasonable out-of-pocket expenses incurred in
connection with Nassau's services hereunder or the subject matter hereof,
including, without limitation, legal, accounting, computer and information
databases, travel and internal administrative expenses. Such reimbursement will
occur on a regular monthly basis. In addition, the Company shall pay all costs
of Nassau, including reasonable fees and disbursements of counsel and any and
all reasonable expenses incurred in investigating, preparing or litigating any
claim by Nassau against the Company relating to payment of Nassau's fees and
expenses hereunder.

         4. Indemnification. The Company shall, whether or not a Transaction is
consummated, indemnify and hold harmless Nassau from and against, and on demand
shall pay or reimburse Nassau for, any and all losses, damages, claims,
liabilities or expenses (including, without limitation, the reasonable fees and
disbursements of counsel and any and all reasonable expenses incurred in
investigating, preparing or defending any pending action or proceeding or any
claim whatsoever) arising out of or relating to Nassau's services hereunder or
the subject matter hereof, except that the Company shall not be responsible
under this paragraph for any loss, damage, claim,



<PAGE>
 
<PAGE>

Barringer Laboratories, Inc.
May 13, 1996
page 7


liability or expense to the extent it is finally determined by a court having
jurisdiction to have resulted primarily from Nassau's bad faith or gross
negligence.

         If for any reason the foregoing indemnity is unavailable or
insufficient to hold Nassau harmless (except by reason of the bad faith or gross
negligence of Nassau), the Company shall contribute to amounts paid or payable
by Nassau in respect of any such losses, damages, claims, liabilities or
expenses in such proportion as is appropriate to reflect not only the relative
benefits received by the Company and its shareholders on the one hand and Nassau
on the other, but also the relative fault of the Company and Nassau, as well as
any other equitable considerations.

         The Company agrees that the indemnification, contribution and
reimbursement commitments set forth in this Section 4 shall apply whether or not
Nassau is a formal party to any lawsuits, claims or other proceedings, and that
Nassau is entitled to retain separate counsel of its choice in connection with
any of the matters to which such commitments relate.

         The foregoing provisions of this Section 4 shall extend, upon the same
terms and conditions, to the benefit of each affiliate of Nassau and each
director, officer, employee and agent of, and each person, if any, who may be
deemed to control, Nassau or any affiliate of Nassau, and to the benefit of each
director, officer, employee and agent of all such controlling persons and the
respective successors, assigns, heirs and personal representatives of each of
the foregoing persons. The indemnification, contribution and reimbursement
commitments set forth in this Section 4 shall be in addition to any liability
the Company may otherwise have to Nassau and shall survive the expiration or
termination of Nassau's engagement hereunder.

         Each party agrees to notify the other party promptly of the assertion
against it or any other person of any claim or the commencement of any action or
proceeding relating to this engagement.

         5. Entire Agreement; Amendment; Survival. This agreement constitutes
the entire agreement of the parties with respect to Nassau's engagement and
supersedes all prior negotiations and understandings of the parties hereto with
respect to the subject matter hereof. This agreement may not be amended or
modified except in a writing signed by each party hereto. The provisions of
Sections 2, 3, 4 and 6 shall survive any termination of Nassau's engagement
hereunder.

         6. Representations and Warranties; Accuracy of Information; Interests
  of Others. The Company represents and warrants that all information furnished
  by it or on its behalf to Nassau shall be complete and accurate in all
  material requests and not misleading. The Company acknowledges and agrees that
  Nassau will be using and relying upon such information supplied by the Company
  and its officers, agents and others and any other publicly available
  information concerning the Company without any independent investigation or
  verification thereof or independent appraisal by Nassau of the Company or its
  business or assets. The Company further represents and warrants that no
  broker, representative or other person has an interest in



<PAGE>
 
<PAGE>

Barringer Laboratories, Inc.
May 13, 1996
page 8


compensation due Nassau hereunder as a result of any act or omission of the
Company or any of its directors, officers, employees or agents, except as has
been and will be disclosed to Nassau with respect to TSG.

         7. Condition Precedent. This Agreement and the engagement described
herein is subject to the condition precedent that Nassau and/or Green Field
Capital Management, Inc. and/or its designees purchase, in total, ten percent
(approximately 165,000 shares) or more of the outstanding shares of the Company
within 30 days of the date of this letter agreement. If this condition precedent
shall fail, then this Agreement shall be void ab initio and of no force or
effect.

         8. Headings. Headings are provided solely for convenience and are not
intended to be a part of this agreement.

         9. Governing Law. This agreement shall be governed by, and construed in
accordance with, the laws of the State of New York.

         If the foregoing is in accordance with your understanding, kindly sign
where indicated below and return an executed copy to us.

                                                 THE NASSAU GROUP, INC.



                                                 By   /s/ J. Francis Lavelle
                                                    ____________________________
                                                    Mr. J. Francis Lavelle
         AGREED TO:                                 Managing Director

         BARRINGER LABORATORIES, INC.



         By    /s/ Robert H. Walker
            ___________________________
            Mr. Robert H. Walker
            President


<PAGE>
 




<PAGE>




                                                                       EXHIBIT 7


                             JOINT FILING AGREEMENT

                  In accordance with Rule 13d-1(f) under the Securities Exchange
Act of 1934,  as amended,  the persons  named below agree to the joint filing on
behalf of each of them of a Statement  on  Schedule  13D  (including  amendments
thereto)  with  respect  to the  common  stock,  par value  $.01 per  share,  of
Barringer Laboratories, Inc., and further agree that this Joint Filing Agreement
be  included  as an Exhibit to such joint  filings.  In  evidence  thereof,  the
undersigned  have  executed  this Joint Filing  Agreement  this 23rd day of May,
1996.



                                              /s/ John P. Holmes, III
                                       ___________________________________
                                                  John P. Holmes, III



                                              /s/ J. Francis Lavelle
                                       ___________________________________
                                                  J. Francis Lavelle



                                               /s/ Thomas A. Dippel
                                       ___________________________________
                                                   Thomas A. Dippel




© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission