[DELOITTE & TOUCHE LOGO]

                                                                      EXHIBIT 23

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

IDEX Corporation:

We consent to the incorporation by reference in the Registration Statement of
IDEX Corporation on Form S-3 (File Number 333-41627) and in the Registration
Statements of IDEX Corporation on Form S-8 (File Numbers 333-102882, 333-104768,
333-18643, 333-70450 and 333-70452) of our reports dated February 14, 2005,
relating to the financial statements and financial statement schedule of IDEX
Corporation and its subsidiaries and management's report on effectiveness of
internal control over financial reporting incorporated by reference in the
Annual Report on Form 10-K of IDEX Corporation for the year ended December 31,
2004.

Deloitte & Touche LLP

Chicago, Illinois

February 25, 2005