EXHIBIT 23.3 VALUATION RESEARCH CORPORATION 100 Nassau Park Blvd Princeton, NJ 08540 Office: 609-452-0900 Fax: 609-452-7651 June 7, 2004 Re: Valuation Appraisal of Eagle Test Systems, Inc. We hereby consent to the use of our firm's name in the Form S-1 of Eagle Test Systems, Inc., and all amendments thereto, and to the reference to our firm under the heading "Experts" in the prospectus in the Form S-1 of Eagle Test Systems, Inc. to be filed with the Securities and Exchange Commission. Very truly yours, VALUATION RESEARCH By: /s/ John D. Czapla John D. Czapla, CFA, ASA Vice President