INDUSTRIAL SCIENTIFIC CORP
SC 13E3, 1999-03-10
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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<PAGE>
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 10, 1999

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 SCHEDULE 13E-3

                        Rule 13e-3 Transaction Statement
       (Pursuant to Section 13(e) of the Securities Exchange Act of 1934)

                       INDUSTRIAL SCIENTIFIC CORPORATION
                                (Name of Issuer)

                       INDUSTRIAL SCIENTIFIC CORPORATION
                          ISC ACQUISITION CORPORATION
                              KENTON E. MCELHATTAN
                               KENT D. MCELHATTAN
                             FLORENCE L. MCELHATTAN
                      (Name of Person(s) Filing Statement)

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

                                  45631G-10-6
                     (CUSIP Number of Class of Securities)

    Robert K. Morris                             James J. Barnes
Reed, Smith, Shaw & McClay           Buchanan Ingersoll Professional Corporation
     435 Sixth Avenue                       One Oxford Centre, 20th Floor
   Pittsburgh, PA 15219                           301 Grant Street
       412/288-3126                             Pittsburgh, PA 15219
                                                    412/562-1415

  (Name, Address and Telephone Number of Persons Authorized to Receive Notices
          and Communications on Behalf of Person(s) Filing Statement)


    This statement is filed in connection with (check the appropriate box):

     a.  [X] The filing of solicitation materials or an information statement 
subject to Regulation 14A, Regulation 14C or Rule 13e-3(c) under the Securities
Exchange Act of 1934.
     b.  [ ] The filing of a registration statement under the Securities Act of 
1933.
     c.  [ ] A tender offer.
     d.  [ ] None of the above.

     Check the following box if the soliciting materials or information
statement referred to in checking box (a) are preliminary copies: [X]

                           CALCULATION OF FILING FEE

 ------------------------------------------------------------------------------
                  Transaction Valuation*    Amount of Filing Fee

                  ----------------------    --------------------
                      $24,566,235             $4,913.25
<PAGE>
 
* Determined by multiplying 842,727 (the number of outstanding shares of the
Common Stock of Industrial Scientific Corporation not owned by Kenton E.
McElhattan, Kent D. McElhattan, Florence L. McElhattan or their Affiliates) by
$28.50 per share and adding the aggregate amount anticipated to be paid to
certain persons holding options to purchase shares of the Common Stock of
Industrial Scientific Corporation in consideration of the cancellation of such
options.

[X]  Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
and identify the filing with which the offsetting fee was previously paid.
Identify the previous filing by registration statement number, or the Form or
Schedule and the date of its filing.

Amount Previously Paid:  $4,913.25

Form or Registration Number:  Schedule 14C

Filing Party:  Industrial Scientific Corporation

Date Filed:  March 10, 1999

     This Rule 13e-3 Transaction Statement (this "Statement") is being filed
concurrently with the filing of a preliminary information statement pursuant to
Regulation 14C under the Securities Exchange Act of 1934 (the "Information
Statement"). The underlying Rule 13e-3 transaction relates to an Agreement and
Plan of Merger, dated as of February 23, 1999 (the "Merger Agreement"), by and
between Industrial Scientific Corporation, a Pennsylvania corporation (the
"Company") and ISC Acquisition Corporation, a Pennsylvania corporation
("Acquisition").  The Merger Agreement provides for the merger (the "Merger") of
Acquisition with and into the Company, with the Company as the corporation
surviving the Merger (the "Surviving Corporation").  Acquisition was formed by
the three largest shareholders of the Company, Kenton E. McElhattan, Chairman of
the Board of Directors of the Company, Kent D. McElhattan, President, Chief
Executive Officer and a director of the Company and Florence L. McElhattan
(collectively, the "Majority Shareholders"), in connection with the Merger.

     The Majority Shareholders currently beneficially own approximately 74.2% of
the outstanding shares of common stock, par value $.01 per share (the "Common
Stock"), of the Company, representing approximately 74.2% of the voting power of
the shareholders of the Company.  It is contemplated that the Majority
Shareholders and their Affiliates (as defined below) will contribute all of
their shares of Common Stock to Acquisition immediately prior to the
Consummation of the Merger.  The Majority Shareholders proposed the Merger in
order to purchase all of the shares of Nonaffiliated Stock.  For purposes of
this Statement Nonaffiliated Stock refers to shares of Common Stock not held by
Acquisition, the Majority Shareholders or certain members of their immediately
family and certain family trusts (their "Affiliates").

     As a result of the Merger, (i) each share of Nonaffiliated Stock (other
than shares owned by those shareholders who have validly perfected their
dissenters rights under Pennsylvania law) will be converted into the right to
receive $28.50 in cash, without interest (the "Merger Consideration"), (ii) each
share of Common Stock owned by Acquisition and the Majority Shareholders will be
canceled with no consideration paid therefor and (iii) each share of the common
stock of Acquisition owned by the Majority Shareholders will be converted into
one share of the common stock of the Surviving Corporation. In addition, upon
consummation of the Merger, (a) each option to purchase shares of Common Stock
held by persons other than the Majority Shareholders (the "Nonaffiliated
Options") will be canceled and each holder of such canceled Nonaffiliated
Options will be paid by the Surviving Corporation, for each such Nonaffiliated
Option, an amount determined by multiplying (x) the excess, if any, of the
Merger Consideration over the applicable exercise price per share of such
Nonaffiliated Option and (y) the number of shares issuable upon exercise of such
Nonaffiliated Option, and (b) all options to purchase shares of Common Stock
held by the Majority Shareholders will be assumed by the Surviving Corporation.
As a result of the Merger, the Majority Shareholders will collectively own 100%
of the capital stock of the Surviving Corporation.

     The cross-reference sheet below is being supplied pursuant to General
Instruction F to Schedule 13E-3 and shows the location in the Information
Statement of the information required to be included in response to the items

                                      -2-
<PAGE>
 
of this Statement. The information in the Information Statement, including the
exhibits thereto, is hereby expressly incorporated herein by reference and
responses to each item in this Statement are qualified in their entirety by the
information contained in the Information Statement. Capitalized terms used but
not defined herein shall have the meanings ascribed thereto in the Information
Statement.

                             CROSS REFERENCE SHEET

<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------

Item 1.  Issuer and Class of Security Subject to
         the Transaction
<S>                                                   <C>
  Item 1(a).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY--Special Factors Regarding the
                                                      Merger--The Parties--The Company; CERTAIN INFORMATION
                                                      REGARDING THE COMPANY

  Item 1(b).........................................  SUMMARY--Special Factors Regarding the Merger--Required
                                                      Vote for Merger; Written Consent in Lieu of Meeting;
                                                      REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING

  Item 1(c).........................................  MARKET PRICE AND DIVIDENDS

  Item 1(d).........................................  MARKET PRICE AND DIVIDENDS

  Item 1(e).........................................  No offering responsive to Item 1(e) has been made by the
                                                      issuer or affiliate within the last three years

  Item 1(f).........................................  MARKET PRICE AND DIVIDENDS

Item 2.  Identity and Background

  Item 2(a)-(d).....................................  SUMMARY--Special Factors Regarding the Merger--The
                                                      Parties--The Company;--Acquisition; MANAGEMENT--Directors
                                                      and Executive Officers of the Company;-- Directors and
                                                      Executive Officers of Acquisition

  Item 2(e).........................................  Not applicable

  Item 2(f).........................................  Not applicable

  Item 2(g).........................................  SUMMARY--Special Factors Regarding the Merger--The
                                                      Parties--The Company;--Acquisition; MANAGEMENT--Directors
                                                      and Executive Officers of the Company;-- Directors and
                                                      Executive Officers of Acquisition

Item 3.  Past Contacts, Transactions or Negotiations

  Item 3(a)(1)......................................  Not applicable
</TABLE> 

                                      -3-
<PAGE>
 
<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------
<S>                                                   <C> 
  Item 3(a)(2) and 3(b).............................  SUMMARY--Special Factors Regarding the Merger--Purpose,
                                                      Background and Effects of the Merger; SPECIAL FACTORS
                                                      REGARDING THE MERGER--Background of the Merger

Item 4.  Terms of the Transaction

  Item 4(a).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY; REQUIRED VOTE FOR MERGER; WRITTEN
                                                      CONSENT IN LIEU OF MEETING; SPECIAL FACTORS REGARDING THE
                                                      MERGER--Background of the Merger;--Interests of Certain
                                                      Persons in the Merger;--Certain Effects of the Merger;
                                                      THE MERGER AGREEMENT; DISSENTERS RIGHTS

  Item 4(b).........................................  SUMMARY--Special Factors Regarding the Merger--Required
                                                      Vote for Merger; Written Consent in Lieu of Meeting;
                                                      --Interests of Certain Persons in the Merger; REQUIRED VOTE
                                                      FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING; SPECIAL
                                                      FACTORS REGARDING THE MERGER--Background of the Merger;
                                                      Interests of Certain Persons in the Merger;--Certain Effects
                                                      of the Merger;--THE MERGER AGREEMENT--Consideration to be Paid
                                                      in the Merger;--Treatment of Options; DISSENTERS RIGHTS

Item 5.  Plans or Proposals of the Issuer or
         Affiliate

  Items 5(a) and 5(b)...............................  SPECIAL FACTORS REGARDING THE MERGER--Background of the
                                                      Merger;--Certain Effects of the Merger; THE MERGER AGREEMENT;
                                                      REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING

  Item 5(c).........................................  SPECIAL FACTORS REGARDING THE MERGER--Interests of Certain Persons
                                                      in the Merger;--Certain Effects of the Merger; THE MERGER
                                                      AGREEMENT--Treatment of Options; CERTAIN INFORMATION
                                                      REGARDING ACQUISITION

  Items 5(d)-(g)....................................  SUMMARY--Special Factors Regarding the Merger--Purpose,
                                                      Background and Effects of the Merger;--Interests of Certain
                                                      Persons in the Merger;--Financing of the Merger; SPECIAL FACTORS
                                                      REGARDING THE MERGER--Interests of Certain Persons in the
                                                      Merger;--Certain Effects of the Merger--Financing of the
                                                      Merger; AVAILABLE INFORMATION

Item 6.  Source and Amounts of Funds or Other
         Consideration

  Items 6(a) and 6(c)...............................  SUMMARY--Special Factors Regarding the Merger--Purpose,
                                                      Background and Effects of the Merger--Financing of the
                                                      Merger; SPECIAL FACTORS REGARDING THE MERGER--Financing of the Merger

  Item 6(b).........................................  ESTIMATED FEES AND EXPENSES

</TABLE> 

                                      -4-
<PAGE>
 
<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------
<S>                                                   <C> 
  Item 6(d).........................................  Not applicable

Item 7.  Purpose(s), Alternatives, Reasons and
         Effects

  Items 7(a), 7(b) and 7(c).........................  SUMMARY--Special Factors Regarding the Merger--Purpose,
                                                      Background and Effects of the Merger;--Financing of the
                                                      Merger; SPECIAL FACTORS REGARDING THE MERGER--Background
                                                      of the Merger;--The Majority Shareholders' Purpose and
                                                      Reasons for the Merger

  Item 7(d).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY--Special Factors Regarding the
                                                      Merger--Purpose, Background and Effects of the
                                                      Merger;--Federal Income Tax Consequences;--The Merger
                                                      Agreement--The Merger Consideration; REQUIRED VOTE FOR
                                                      MERGER; WRITTEN CONSENT IN LIEU OF MEETING; SPECIAL FACTORS
                                                      REGARDING THE MERGER--The Majority Shareholders' Purpose
                                                      and Reasons for the Merger;--Certain Effects of the Merger;
                                                      --Certain Federal Income Tax Consequences of the Merger;
                                                      --Accounting Treatment; THE MERGER AGREEMENT--Consideration to
                                                      be Paid in the Merger;--The Exchange Fund; Payment for Shares
                                                      of Common Stock

Item 8.  Fairness of the Transaction

  Item 8(a).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY--Special Factors Regarding the
                                                      Merger--Approval by the Board of Directors; REQUIRED VOTE
                                                      FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING; SPECIAL FACTORS
                                                      REGARDING THE MERGER--Background of the Merger;--The Majority
                                                      Shareholders' Purpose and Reasons for the Merger;--Opinion
                                                      of Financial Advisor

  Item 8(b).........................................  SUMMARY--Special Factors Regarding the Merger--Purpose,
                                                      Background and Effects of the Merger;--Approval by the
                                                      Board of Directors;--Ladenburg Thalmann Fairness Opinion;
                                                      SPECIAL FACTORS REGARDING THE MERGER--Background of the
                                                      Merger;--The Majority Shareholders' Purpose and Reasons for
                                                      the Merger;--Opinion of the Financial Advisor;--Certain Effects
                                                      of the Merger

  Item 8(c).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER; SUMMARY--Special
                                                      Factors Regarding the Merger--Required Vote for Merger;
                                                      Written Consent in Lieu of Meeting;--The Merger
                                                      Agreement--Conditions to the Merger; REQUIRED VOTE FOR
                                                      MERGER; WRITTEN CONSENT IN LIEU OF MEETING; THE MERGER
                                                      AGREEMENT--Conditions to the Merger
</TABLE> 

                                      -5-
<PAGE>
 
<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------
<S>                                                   <C> 
  Item 8(d).........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY--Special Factors Regarding the
                                                      Merger--Approval by the Board of Directors; --Ladenburg
                                                      Thalmann Fairness Opinion; REQUIRED VOTE FOR MERGER;
                                                      WRITTEN CONSENT IN LIEU OF MEETING; SPECIAL FACTORS REGARDING
                                                      THE MERGER--Background of the Merger;--Opinion of the Financial
                                                      Advisor

  Item 8(e).........................................  SPECIAL FACTORS REGARDING THE MERGER--Background of the Merger

  Item 8(f).........................................  Not applicable

Item 9.  Reports, Opinions, Appraisals and Certain
         Negotiations

  Items 9(a) and 9(b)...............................  SUMMARY--Special Factors Regarding the Merger--Ladenburg
                                                      Thalmann Fairness Opinion; SPECIAL FACTORS REGARDING THE MERGER
                                                      --Background of the Merger;--Opinion of the Financial Advisor

  Item 9(c).........................................  AVAILABLE INFORMATION

Item 10.  Interest in Securities of the Issuer

  Item 10(a)........................................  SUMMARY--Special Factors Regarding the Merger--Required
                                                      Vote for Merger; Written Consent in Lieu of
                                                      Meeting;--Interests of Certain Persons in the Merger;
                                                      REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF
                                                      MEETING; SPECIAL FACTORS REGARDING THE MERGER--Interests of
                                                      Certain Persons in the Merger; PRINCIPAL SHAREHOLDERS AND
                                                      STOCK OWNERSHIP OF MANAGEMENT

  Item 10(b)........................................  MARKET PRICE AND DIVIDENDS

Item 11.  Contracts, Arrangements or Understandings
          with Respect to the Issuer's Securities

  Item 11...........................................  SUMMARY--Special Factors Regarding the Merger--Financing of
                                                      the Merger; SPECIAL FACTORS REGARDING THE MERGER--Background of the
                                                      Merger;--Interests of Certain Persons in the
                                                      Merger;--Financing of the Merger; THE MERGER AGREEMENT
</TABLE> 

                                      -6-
<PAGE>
 
<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------
<S>                                                   <C> 
Item 12.  Present Intention and Recommendation of
          Certain Persons with Regard to the 
          Transaction

  Item 12(a)........................................  SUMMARY--Special Factors Regarding the Merger--Approval by
                                                      the Board of Directors; --Interests of Certain Persons in
                                                      the Merger; --Required Vote for Merger; Written Consent in
                                                      Lieu of Meeting; REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
                                                      IN LIEU OF MEETING; PRINCIPAL SHAREHOLDERS AND STOCK
                                                      OWNERSHIP OF MANAGEMENT

  Item 12(b)........................................  SUMMARY--Special Factors Regarding the Merger--Approval by
                                                      the Board of Directors; --Interests of Certain Persons in
                                                      the Merger; -- Required Vote for Merger; Written Consent in
                                                      Lieu of Meeting; REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
                                                      IN LIEU OF MEETING; SPECIAL FACTORS REGARDING THE MERGER--
                                                      Background of the Merger

Item 13.  Other Provisions of the Transaction

  Item 13(a)........................................  QUESTIONS AND ANSWERS ABOUT THE MERGER AND ARTICLES
                                                      AMENDMENT; SUMMARY--Special Factors Regarding the
                                                      Merger--Dissenters Rights; DISSENTERS RIGHTS

  Item 13(b)........................................  Not applicable

  Item 13(c)........................................  Not applicable

Item 14.  Financial Information

  Items 14(a).......................................  INDEX TO FINANCIAL STATEMENTS

  Item 14(b)........................................  Not applicable

Item 15.  Persons and Assets Employed, Retained or
          Utilized

  Item 15(a)........................................  REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF
                                                      MEETING; SPECIAL FACTORS REGARDING THE MERGER--Background
                                                      of the Merger; ESTIMATED FEES AND EXPENSES

  Item 15(b)........................................  Not applicable

Item 16.  Additional Information

  Item 16...........................................  Information Statement

Item 17.  Material to be Filed as Exhibits

  Item 17(a)........................................  Financing Commitment Letter from PNC Bank, National
                                                      Association to ISC Acquisition Corporation, dated as of
                                                      March 4, 1999

</TABLE> 

                                      -7-
<PAGE>
 
<TABLE>
<CAPTION>
                   Schedule 13E-3
              Item Number and Caption                              Location in Information Statement
- ----------------------------------------------------  ------------------------------------------------------------
<S>                                                   <C> 
  Item 17(b)........................................  Opinion of Ladenburg Thalmann, dated February 23, 1999 (set
                                                      forth as Exhibit B the Information Statement)*

  Item 17(c)........................................  Agreement and Plan of Merger by and between Industrial
                                                      Scientific Corporation and ISC Acquisition Corporation,
                                                      dated as of February 23, 1999 (set forth as Exhibit A to
                                                      the Information Statement)*

  Item 17(d)........................................  Information Statement

  Item 17(e)........................................  Part I, Chapter 15, Subchapter D of the Pennsylvania
                                                      Business Corporation Law of 1988 (set forth as Exhibit C to
                                                      the Information Statement)*

  Item 17(f)........................................  No such written instrument, form or other material has been
                                                      furnished as of the date hereof
</TABLE>
*  Incorporated by reference to the Information Statement.

                                      -8-
<PAGE>
 
Item 1.    Issuer and Class of Security Subject to the Transaction.
           --------------------------------------------------------

      (a)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER
AND ARTICLES AMENDMENT," "SUMMARY--Special Factors Regarding the Merger--The
Parties--The Company" and "CERTAIN INFORMATION REGARDING THE COMPANY" of the
Information Statement is incorporated herein by reference.

      (b)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Required Vote for Merger; Written Consent in Lieu of Meeting" and
"REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING" of the
Information Statement is incorporated herein by reference.

      (c)  The information set forth in "MARKET PRICE AND DIVIDENDS" of the
Information Statement is incorporated by reference herein.

      (d)  The information set forth in "MARKET PRICE AND DIVIDENDS" of the
Information Statement is incorporated by reference herein.

      (e)  No offering responsive to Item 1(e) has been made by the issuer or
affiliate within the last three years.

      (f)  The information set forth in "MARKET PRICE AND DIVIDENDS" of the
Information Statement is incorporated by reference herein.

Item 2.    Identity and Background.
           ------------------------

     This Statement is being filed jointly by the Company (which is the issuer
of the class of equity securities that is the subject of the Rule 13e-3
transaction), and Acquisition.

      (a)-(d) The information set forth in "SUMMARY--Special Factors Regarding
the Merger--The Parties--The Company," "--Acquisition," "MANAGEMENT--Directors
and Executive Officers of the Company" and "-- Directors and Executive Officers
of Acquisition" of the Information Statement is incorporated herein by
reference.

      (e)  Not applicable.

      (f)  Not applicable.

      (g)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--The Parties--The Company," "--Acquisition," "MANAGEMENT--Directors and
Executive Officers of the Company" and "-- Directors and Executive Officers of
Acquisition" of the Information Statement is incorporated herein by reference.

Item 3.  Past Contracts, Transactions or Negotiations.
         -------------------------------------------- 
      (a)(1)  Not applicable.

      (a)(2) and (b) The information set forth in "SUMMARY--Special Factors
Regarding the Merger--Purpose, Background and Effects of the Merger" and 
"SPECIAL FACTORS REGARDING THE MERGER-- Background of the Merger" of the
Information Statement is incorporated herein by reference.

Item 4.  Terms of the Transaction.
         ------------------------ 
      (a)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER
AND ARTICLES AMENDMENT," "SUMMARY," "REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER-- Background of the
Merger," "--Interests of Certain Persons in the

                                      -9-
<PAGE>
 
Merger," "--Certain Effects of the Merger," "THE MERGER AGREEMENT" and
"DISSENTERS RIGHTS" of the Information Statement is incorporated herein by
reference.

      (b)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Interests of Certain Persons in the Merger,"--Required Vote for Merger;
Written Consent in Lieu of Meeting," "REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER--Background of the
Merger," "--Interests of Certain Persons in the Merger," "--Certain Effects of
the Merger," "THE MERGER AGREEMENT--Consideration to be Paid in the Merger," "--
Treatment of Options" and "DISSENTERS RIGHTS" of the Information Statement is
incorporated herein by reference.

Item 5.  Plans or Proposals of the Issuer or Affiliate.
         --------------------------------------------- 
 
 
     (a) and (b) The information set forth in "SPECIAL FACTORS REGARDING THE
MERGER-- Background of the Merger; "--Certain Effects of the Merger," "THE
MERGER AGREEMENT" and "REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF
MEETING" of the Information Statement is incorporated herein by reference.

     (c)  The information set forth in "SPECIAL FACTORS REGARDING THE MERGER--
Interests of Certain Persons in the Merger," --Certain Effects of the Merger,"
"THE MERGER AGREEMENT--Treatment of Options" and "CERTAIN INFORMATION REGARDING
ACQUISITION" of the Information Statement is incorporated herein by reference.

     (d)-(g) The information set forth in "SUMMARY--Special Factors Regarding
the Merger--Purpose, Background and Effects of the Merger," "--Interests of
Certain Persons in the Merger," "Financing of the Merger," "SPECIAL FACTORS 
REGARDING THE MERGER--Interests of Certain Persons in the Merger," "--Certain
Effects of the Merger," "--Financing of the Merger" and "AVAILABLE INFORMATION"
of the Information Statement is incorporated herein by reference.

Item 6.  Source and Amounts of Funds or Other Consideration.
         -------------------------------------------------- 
 
     (a) and (c) The information set forth in "SUMMARY--Special Factors
Regarding the Merger--Purpose, Background and Effects of the Merger," "--
Financing of the Merger" and "SPECIAL FACTORS REGARDING THE MERGER--Financing of
the Merger" of the Information Statement is incorporated herein by reference.

     (b)  The information set forth in "ESTIMATED FEES AND EXPENSES" of the 
Information Statement is incorporated herein by reference.
 
     (d)  Not applicable.

Item 7.  Purpose(s), Alternatives, Reasons and Effects.
         --------------------------------------------- 
  
     (a)-(c) The information set forth in "SUMMARY--Special Factors Regarding
the Merger--Purpose, Background and Effects of the Merger," "--Financing of the
Merger," "SPECIAL FACTORS REGARDING THE MERGER--Background of the Merger" and
"--The Majority Shareholders' Purpose and Reasons for the Merger" of the
Information Statement is incorporated herein by reference.

     (d)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER
AND ARTICLES AMENDMENT," "SUMMARY--Special Factors Regarding the Merger--
Purpose, Background and Effects of the Merger," "--Federal Income Tax
Consequences," "--The Merger Agreement--The Merger Consideration," "REQUIRED
VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING
THE MERGER--The Majority Shareholders' Purpose and Reasons for the Merger," "--
Certain Effects of the Merger," "--Certain Federal Income Tax Consequences of
the Merger," "--Accounting Treatment," "THE MERGER AGREEMENT--Consideration to
be Paid in the Merger" and "--The Exchange Fund; Payment for Shares of Common
Stock" of the Information Statement is incorporated herein by reference.

                                      -10-
<PAGE>
 
Item 8.  Fairness of the Transaction.
         --------------------------- 

     (a)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER
AND ARTICLES AMENDMENT," "SUMMARY--Special Factors Regarding the Merger--
Approval by the Board of Directors," "REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER--Background of the
Merger," "--The Majority Shareholders' Purpose and Reasons for the Merger" and
"--Opinion of the Financial Advisor" of the Information Statement is
incorporated herein by reference.

     (b)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Purpose, Background and Effects of the Merger," "Approval by the Board
of Directors," "--Ladenburg Thalmann Fairness Opinion," "SPECIAL FACTORS 
REGARDING THE MERGER--Background of the Merger," "--The Majority Shareholders'
Purpose and Reasons for the Merger," "--Opinion of Financial Advisor" and "--
Certain Effects of the Merger" of the Information Statement is incorporated
herein by reference.

     (c)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER 
AND ARTICLES AMENDMENT," "SUMMARY--Special Factors Regarding the Merger--
Required Vote for Merger; Written Consent in Lieu of Meeting," "--The Merger
Agreement--Conditions to the Merger," "REQUIRED VOTE FOR MERGER; WRITTEN CONSENT
IN LIEU OF MEETING" and "THE MERGER AGREEMENT--Conditions to the Merger" of the
Information Statement is incorporated herein by reference.

     (d)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER,"
"SUMMARY--Special Factors Regarding the Merger--Approval by the Board of
Directors," "--Ladenburg Thalmann Fairness Opinion," "REQUIRED VOTE FOR MERGER;
WRITTEN CONSENT IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER--
Background of the Merger" and "--Opinion of the Financial Advisor" of the
Information Statement is incorporated herein by reference.

     (e)  The information set forth in "SPECIAL FACTORS REGARDING THE MERGER--
Background of the Merger" of the Information Statement is incorporated herein by
reference.

     (f)  Not applicable.

Item 9.  Reports, Opinions, Appraisals and Certain Negotiations.
         ------------------------------------------------------ 
 
 
     (a) and (b) The information set forth in "SUMMARY--Special Factors
Regarding the Merger--Ladenburg Thalmann Fairness Opinion," "SPECIAL FACTORS 
REGARDING THE MERGER--Background of the Merger" and "--Opinion of the Financial
Advisor" of the Information Statement is incorporated herein by reference.

     (c)  The information set forth in "AVAILABLE INFORMATION" of the
Information Statement is incorporated herein by reference.

Item 10.  Interest in Securities of the Issuer.
          ------------------------------------ 
     (a)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Required Vote for Merger; Written Consent in Lieu of Meeting,"
"Interests of Certain Persons in the Merger," "REQUIRED VOTE FOR MERGER; WRITTEN
CONSENT IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER--Interests of
Certain Persons in the Merger;" "PRINCIPAL AND SHAREHOLDERS AND STOCK OWNERSHIP
OF MANAGEMENT" of the Information Statement is incorporated herein by reference.

     (b)  The information set forth in "MARKET PRICE AND DIVIDENDS" of the 
Information Statement is incorporated herein by reference.

                                      -11-
<PAGE>
 
Item 11.  Contracts, Arrangements or Understandings with Respect to the Issuer's
          ----------------------------------------------------------------------
          Securities.
          ---------- 

     The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Financing of the Merger," "SPECIAL FACTORS REGARDING THE MERGER--
Background of the Merger," "--Interests of Certain Persons in the Merger," "--
Financing of the Merger" and "THE MERGER AGREEMENT" of the Information Statement
is incorporated herein by reference.

Item 12.  Present Intention and Recommendation of Certain Persons with Regard to
          ----------------------------------------------------------------------
          the Transaction.
          --------------- 

     (a)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Approval by the Board of Directors," "--Interests of Certain Persons in
the Merger," "--Required Vote for Merger; Written Consent in Lieu of Meeting,"
"REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING" and "PRINCIPAL
SHAREHOLDERS AND STOCK OWNERSHIP OF MANAGEMENT" of the Information Statement is
incorporated herein by reference.

     (b)  The information set forth in "SUMMARY--Special Factors Regarding the
Merger--Approval by the Board of Directors," "--Interests of Certain Persons in
the Merger," "--Required Vote for Merger; Written Consent in Lieu of Meeting,"
"REQUIRED VOTE FOR MERGER; WRITTEN CONSENT IN LIEU OF MEETING" and "SPECIAL 
FACTORS REGARDING THE MERGER--Background of the Merger" of the Information
Statement is incorporated herein by reference.

Item 13.  Other Provisions of the Transaction.
          ----------------------------------- 

     (a)  The information set forth in "QUESTIONS AND ANSWERS ABOUT THE MERGER
AND ARTICLES AMENDMENT," "SUMMARY--Special Factors Regarding the Merger--
Dissenters Rights" and "DISSENTERS RIGHTS" of the Information Statement is
incorporated by reference herein.

     (b)  Not applicable.

     (c)  Not applicable.

Item 14.  Financial Information.
          --------------------- 
     (a)  The information set forth in "INDEX TO FINANCIAL STATEMENTS" of the
Information Statement is incorporated herein by reference.

     (b)  Not applicable.

Item 15.  Persons and Assets Employed, Retained or Utilized.
          ------------------------------------------------- 
     (a)  The information set forth in "REQUIRED VOTE FOR MERGER; WRITTEN
CONSENT IN LIEU OF MEETING," "SPECIAL FACTORS REGARDING THE MERGER--Background
of the Merger" and "ESTIMATED FEES AND EXPENSES" of the Information Statement is
incorporated herein by reference.

     (b)  Not applicable.

Item 16.  Additional Information.
          ---------------------- 

     Information Statement

Item 17.  Material to be Filed as Exhibits.
          -------------------------------- 
  
 
     (a) Financing Commitment Letter from PNC Bank, National Association to ISC
Acquisition Corporation, dated March 4, 1999

                                      -12-
<PAGE>
 
     (b) Opinion of Ladenburg Thalmann, dated February 23, 1999 (set forth as
Exhibit B to the Information Statement)*

     (c) Agreement and Plan of Merger by and between Industrial Scientific
Corporation and ISC Acquisition Corporation, dated as of February 23, 1999 (set
forth as Exhibit A to the Information Statement)*

     (d)  Information Statement.

     (e) Part 1, Chapter 15, Subchapter D of the Pennsylvania Business
Corporation Law of 1988 (set forth as Exhibit C to the Information Statement)*

     (f)  As of the date of this Statement, no written instruction, form or
other material has been furnished to any person making the actual oral
solicitation or other recommendation for such person's use, directly or
indirectly in connection with the Rule 13e-3 transaction.

*  Incorporated by reference to the Information Statement.

                                      -13-
<PAGE>
 
                                   SIGNATURE

     After due inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.

Dated:  March 10, 1999

                              INDUSTRIAL SCIENTIFIC CORPORATION

                              By:    /s/ James P. Hart          
                                 --------------------------
                                   James P. Hart          
                                   Vice President Finance

                              ISC ACQUISITION CORPORATION

                              By:    /s/ Kent D. McElhattan
                                 --------------------------
                                    Kent D. McElhattan
                                    President


                              KENTON E. MCELHATTAN


                              By:    /s/ Kenton E. McElhattan
                                  ----------------------------



                              KENT D. MCELHATTAN


                              By:    /s/ Kent D. McElhattan
                                  --------------------------



                              FLORENCE L. MCELHATTAN


                              By:    /s/ Florence L. McElhattan
                                  ------------------------------

                                      -14-
<PAGE>
 
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
    EXHIBIT                                                 DESCRIPTION
<S>                      <C> 
Exhibit 99.17(a)         Financing Commitment Letter from PNC Bank, National Association to ISC
                         Acquisition Corporation, dated March 4, 1999

Exhibit 99.17(b)         Opinion of Ladenburg Thalmann, dated February 23, 1999 (set forth as Exhibit
                         B to the Information Statement)*

Exhibit 99.17(c)         Agreement and Plan of Merger by and between Industrial Scientific
                         Corporation and ISC Acquisition Corporation, dated as of February 23, 1999
                         (set forth as Exhibit A to the Information Statement)*

Exhibit 99.17(d)         Information Statement

Exhibit 99.17(e)         Part I, Chapter 15, Subchapter D of the Pennsylvania Business Corporation
                         Law of 1988 (set forth as Exhibit C to the Information Statement)*
</TABLE>
*  Incorporated by reference to the Information Statement.

                                      -15-

<PAGE>
 
                                                                Exhibit 99.17(a)


                                 March 4, 1999



ISC Acquisition Corporation
1001 Oakdale Road
Oakdale, PA 15071

Attention:  James P. Hart
            Vice President/Chief Financial Officer

RE:         $27,000,000 Acquisition Financing

Dear Jim:

     PNC Bank, National Association (the "Bank"), is pleased to advise you that
we have approved a $10,000,000 Reducing Revolving Credit Facility (the "Credit
Facility") and a $17,000,000 90-Day Note (the "Note") to ISC Acquisition
Corporation (the "Borrower"), a corporation created to merge with Industrial
Scientific Corporation. The Credit Facility and Note are described in the
Summary of Terms and Conditions that is attached to and made a part of this
letter (the "Summary"). The Bank looks forward to working with you towards the
closing of the Credit Facility and the Note.

     The Summary includes only a brief description of the principal terms of the
Credit Facility and Note. The definitive terms of the Credit Facility and Note
will be documented in a Loan Agreement and the other agreements, instruments,
certificates and documents called for by the Loan Agreement or which the Bank
may otherwise require (together with the Loan Agreement, the "Loan Documents").

     Although the Bank has approved the Credit Facility and the Note, the Bank's
obligations are subject to several conditions. First, the Borrower must accept
this letter as provided below, and must comply with all the other conditions of
this letter and the Summary. After receiving the Borrower's acceptance, the
definitive Loan Documents can be prepared. The Bank's obligations are
conditioned on the Loan Documents being signed and delivered to the Bank in a
form that is satisfactory to the Bank and its counsel. This letter is also
issued subject to the statutory and other requirements by which the Bank is
governed. Finally, the Bank's obligations under this letter are subject to the
condition that no material adverse change occurs in the business, assets,
operations, financial condition or business prospects of the Borrower.
<PAGE>
 
ISC Acquisition Corporation
March 4, 1999
Page Two



     We appreciate this opportunity to provide financial services to you, and
look forward to your acceptance of this letter.


                                             Very truly yours,

                                             PNC BANK, National Association

                                             /s/ Mark J. Stasenko

                                             By:  Mark J. Stasenko
                                             Title:  Vice President



With the intent to be legally bound,
the above terms and conditions are
hereby agreed to and accepted.

ISC Acquisition Corporation


By:
    ----------------------------------

Title:
    ----------------------------------

Date:
    ----------------------------------

                                      -2-
<PAGE>
 
                                                                   March 4, 1999

                        Summary of Terms and Conditions


_________________________     ISC Acquisition Corporation (the "Company" or 
Borrower                      the "Borrower")  
                              
                              
_________________________     PNC Bank, National Association ("PNC", the 
Bank                          "Bank")  
                              
                              
_________________________     Subject to acceptable documentation,
Credit Facility               the Bank will provide:
                              
                              I.  $10,000,000 Reducing Revolving
                                  Credit Facility ("Revolver"). The
                                  commitment under the Revolver will
                                  reduce annually, on the anniversary
                                  date by $2,000,000.
                              
                              II. $17,000,000 90-day Note.
                            
_________________________     To acquire all of the outstanding shares of 
Purpose                       Industrial Scientific Corporation (ISCX) not 
                              owned or controlled by the McElhattan family
                              for an amount not to exceed $28.50/share plus 
                              transaction expenses.
                              
                              
_________________________     I.     Five Years from the date of closing.
Maturity                               
                              
                              II.    90 days from the date of closing
                              
_________________________     I.     At maturity. Until maturity, the Company 
Repayment                            may borrow, repay and reborrow up to the 
                                     committed amount. The committed amount 
                                     reduces $2,000,000 annually until maturity.
                              
                              II.    At maturity.
                              
_________________________     I,II.  Floating Rate Option: PNC Bank Base Rate*
Interest Rates                       or Libor plus the credit spread based on 
                                     the Funded Debt/EBITDA Ratio on a
                                     rolling four quarter basis,
                                     determined each quarter as follows:

                                      -3-
<PAGE>
 
                              Funded Debt             LIBOR +     Commitment
                                Ratio **                           Fee ***
                              -----------------------------------------------
                              (Less than sign)=1.75    75 bps      30 bps
                              -----------------------------------------------
                              (Greater than sign)1.75  50 bps      20 bps
                              -----------------------------------------------
 
                              * The Base Rate is the higher of PNC
                              Bank's Prime rate or the Federal
                              Funds rate plus 1/2%.
                              
                              ** Funded Debt Ratio consists of the
                              Company's Total Indebtedness to
                              earnings before interest, taxes,
                              depreciation and amortization
                              ("EBITDA"). Total Indebtedness is
                              defined as all indebtedness for
                              borrowed money (short and long
                              term), subordinated debt,
                              capitalized leases, reimbursement
                              obligations under letters of credit
                              and any guaranteed obligations.
                              
                              *** The commitment fee is payable on
                              the unused portion of the Revolving
                              Credit Facility payable quarterly in
                              arrears.
                              
                              Interest on Base Rate borrowings is
                              calculated on an actual/365 or 366
                              day basis and is payable quarterly.
                              
                              Under the Revolving Credit Facility,
                              the Company may have no more than
                              five borrowing tranches, including
                              the Base Rate tranche, at any one
                              time.
                              
                              II.  Fixed Rate Option:
                                   PNC Bank Cost of Funds + 50 bps. As
                                   of March 1, 1999, the indicative
                                   Fixed Rate is 6.22%. The actual rate
                                   will be set at closing.
                              
                                   Prepayment under the Fixed Rate
                                   Option may be subject to a
                                   prepayment penalty if the current
                                   rates on comparable treasury notes
                                   are lower than the rates on treasury
                                   notes at closing. If so, the penalty
                                   is the present value of the
                                   difference.
                              
                                   Interest on LIBOR borrowings is
                                   calculated on an actual/360 day
                                   basis and is payable the earlier of
                                   quarterly or on the last day of each
                                   interest period. LIBOR advances will
                                   be available for periods of 1, 2, 3
                                   or 6 months. LIBOR pricing will be
                                   adjusted for any statutory reserves.
                              

                                      -4-
<PAGE>
 
                                   Subsequent to an Event of Default
                                   which continues beyond any
                                   applicable cure period, outstandings
                                   shall bear interest at 2% over the
                                   rate of interest applicable under
                                   the Base Rate pricing option.
                              
_________________________     The Company shall pay the Banks such
Yield Protection              additional amounts as will
                              compensate the Banks in the event
                              applicable law, or change in law,
                              subjects the Banks to reserve
                              requirements, capital requirements,
                              taxes (except for taxes on the
                              overall net income of the Banks) or
                              other charges which increase the
                              cost or reduce the yield to the
                              Banks, under customary yield
                              protection provisions.
                              
                              
_________________________     
Fees                          
                              
Closing                       $10,000 payable to Bank at closing.
                              
_________________________     Reasonable out-of-pocket expenses
Expenses                      incurred by Bank shall be for the
                              account of the Company. These
                              include fees and expenses of any of
                              Bank's legal counsel. Initial
                              documentation will be prepared at
                              the Bank's expense. Subsequent
                              negotiations, if extensive, will
                              result in legal costs to be paid by
                              the Company.
                              
                              
_________________________     I.  No collateral is required. The
Collateral                        Company will agree not to grant a
                                  blanket lien on its assets to any
                                  other creditor.
                              
                              II. The Borrower will be required
                                  to provide Cash Collateral to the
                                  extent any portion of this Note
                                  remains outstanding at the close of
                                  business on the day the Borrower
                                  merges with Industrial Scientific
                                  Corporation. Additionally, the
                                  Company will agree not to grant a
                                  blanket lien on its assets to any
                                  other creditor.
                              
_________________________     a.  Organization and qualification.
Representations and
Warranties
                              b.  Capitalization and ownership.
                              
                              c.  Subsidiaries.
                              
                              d.  Power and authority.

                                      -5-
<PAGE>
 
                              e.  Validity, binding effect and
                                  enforceability.
                              
                              f.  No conflict.
                              
                              g.  Litigation.
                              
                              h.  Title to properties.
                              
                              i.  Financial statements; no
                                  material adverse change.
                               
                              j.  Margin stock.
                              
                              k.  Full disclosure.
                              
                              l.  Taxes.
                              
                              m.  Consents and approvals.
                              
                              n.  No Event of Default; compliance
                                  with instruments.
                              
                              o.  Patents, trademarks, copyrights,
                                  licenses.
                               
                              p.  Security interests.
                              
                              q.  Mortgage liens.
                              
                              r.  Insurance.
                              
                              s.  Compliance with laws.
                              
                              t.  Material contracts.
                              
                              u.  Investment companies.
                              
                              v.  Plans and benefit arrangements.
                              
                              w.  Employment matters.
                              
                              x.  Environmental matters.
                              
                              y.  Senior debt status.
                              
                              z.  Year 2000 compliant.

                                      -6-
<PAGE>
 
                              Other Representations and Warranties
                              as appropriate.
                              
_________________________     Receipt by Bank of the following, in
Conditions Precedent to       form and substance satisfactory to
Lending                       the Bank: 
                              
                              
                              
                              a.  Closing certificate as to
                                  accuracy of Representation and
                                  Warranties, compliance with
                                  covenants and absence of Event of
                                  Default or Potential Event of
                                  Default.
                              
                              b.  Certified resolutions,
                                  incumbency certificate and corporate
                                  documents.
                              
                              c.  Delivery of all definitive
                                  financing documents.
                              
                              d.  Opinion of counsel.
                              
                              e.  No material adverse change in
                                  the Borrower and/or Industrial
                                  Scientific Corporation.
                              
                              f.  No material litigation.
                              
                              g.  Payment of all fees and expenses
                                  subject to reimbursement.
                              
                              h.  Evidence that Industrial
                                  Scientific has not less than
                                  $17,000,000 in cash.
                              
                              i.  Execution of an agreement
                                  satisfactory to the Bank between the
                                  Borrower, Bank and Exchange Agent.
                              
                              j.  Satisfactory review of an
                                  Assumption Agreement between
                                  Borrower and Industrial Scientific
                                  Corporation providing for the full
                                  and timely assumption of Borrowers
                                  liabilities.
                              
                              Other Conditions Precedent to
                              Lending as appropriate.
                              
_________________________     a.  Provide within 45 days after
Affirmative Covenants             each fiscal quarter, consolidated
                                  balance sheets and consolidated
                                  statements of income, retained
                                  earnings and cash flow together with
                                  a Certificate of Compliance from the
                                  Chief Executive Officer, President
                                  or Chief Financial Officer of the
                                  Company.

                                      -7-
<PAGE>
 
                              b.  Provide within 90 days after
                                  each fiscal year-end, consolidated
                                  balance sheets and consolidated
                                  statements of income, retained
                                  earnings and cash flow together with
                                  (i) a report of an independent
                                  certified public accountant
                                  satisfactory to the Bank, (ii) any
                                  management letters of such
                                  accountants addressed to the Company
                                  and (iii) a Certificate of
                                  Compliance from the Chief Executive
                                  Officer, President or Chief
                                  Financial Officer of the Company.
                              
                              Other Affirmative Covenants as
                              appropriate.
                              
_________________________     a.  Leverage - The Company's Funded
Negative Covenants                Debt to EBITDA shall not exceed
                                  2.00x.
                              
                              
                              b.  Fixed Charge Coverage Ratio - As
                                  of the end of each fiscal quarter,
                                  for the previous four quarters, the
                                  ratio of the Company's Cash Flow
                                  from Operations to Fixed Charges
                                  shall not be less than 1.0:1.
                              
                                  Cash Flow from Operations is defined
                                  as Net Income + Interest Expense +
                                  Depreciation + Amortization + Taxes
                                  + Non-Cash. Fixed Charges are
                                  defined as Scheduled Principal
                                  Payments or scheduled reductions in
                                  the Revolver + Interest Expense +
                                  Taxes + Dividends (including
                                  distributions for S-Corp taxes if
                                  the Borrower makes that election) +
                                  Stock repurchases post
                                  closing/merger + Capital
                                  Expenditures.
                              
                              c.  Limitation on sale of assets.
                              
                              d.  Limitation on additional
                                  indebtedness, liens and leases.
                              
                              e.  Prohibition on change of
                                  business.
                              
                              f.  Prohibition on change of control.
                              
                              g.  Limitations on mergers and
                                  acquisitions.
                              
                              h.  Limitations on Investments and
                                  Advances to Officers.

                                      -8-
<PAGE>
 
                              Other Negative Covenants as
                              appropriate.
                              
_________________________     a.  Payment default.
Events of Default             
                              
                              b.  Breach of Representations or
                                  Warranties.
                              
                              c.  Violation of covenant(s).
                              
                              d.  Cross default to other debt.
                              
                              e.  Bankruptcy, insolvency.
                              
                              f.  Failure of Borrower to merger
                                  with Industrial Scientific
                                  Corporation within 48 hours of
                                  funding the Revolver.
                              
                              Other Events of Default as
                              appropriate.
                              
_________________________     Pennsylvania.
Governing Law

                                      -9-


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