EXHIBIT 10.1


                    FOURTH AMENDMENT TO EMPLOYMENT AGREEMENT


     THIS AGREEMENT  entered into as of the 6th day of February,  2008,  between
ESCO Technologies Inc. ("Company") and Gary E. Muenster ("Executive").

                                   WITNESSETH:

     WHEREAS, the Company and the Executive entered into an Employment Agreement
as of the 3rd day of November,  1999 ("Agreement"),  which Agreement was amended
as of the 9th day of August,  2001; the 5th day of May, 2004; and the 3rd day of
October, 2007; and

     WHEREAS,  the parties retained the right to amend the Agreement pursuant to
Article 15 thereof; and

     WHEREAS,  the parties  desire to again amend the Agreement  effective as of
February 6, 2008.

     NOW, THEREFORE,  effective as of February 6, 2008, the Agreement is amended
as follows:

     1.   The first sentence of Subparagraph  (1) of Paragraph 9.a is revised to
          read as follows:

          The Company shall pay the Executive an amount equal to his base salary
          for 24 months  following such  termination  of employment  ("Severance
          Period") at the rate in effect at the date of such termination.

     2.   The first sentence of Subparagraph  (2) of Paragraph 9.a is revised to
          read as follows:

          As a supplement  to the payment of the  Executive's  base salary under
          Subparagraph  (a)1, above, the Company shall also pay the Executive an
          amount equal to his PCP  Percentage  and ICP Percentage (as herinafter
          defined),  as applicable,  for 24 months following such termination in
          the same manner as determined under Subparagraph (a)1.



     IN WITNESS WHEREOF,  the foregoing  Agreement was executed  effective as of
February 6, 2008.

ESCO TECHNOLOGIES INC.


By: /s/ Deborah J. Hanlon                                /s/ G. E. Muenster
   ----------------------                                ------------------
                                                          Executive