Exhibit 18
Dear Sirs/Madams:
At your request, we have read the description included in your Quarterly Report on Form 10-Q
to the Securities and Exchange Commission for the quarter ended
March 31, 2009, of the facts
relating to the change in accounting for certain inventories from the last-in, first-out to
first-in, first-out method. We believe, on the basis of the facts so set forth and other
information furnished to us by appropriate officials of
the Company, that the accounting change
described in your Form 10-Q is to an alternative accounting principle that is preferable under the
circumstances.
We have not audited any consolidated financial statements of IDEX Corporation and its
consolidated
subsidiaries as of any date or for any period subsequent to
December 31, 2008.
Therefore, we are unable to express, and we do not express, an opinion on the facts set forth in
the above-mentioned Form 10-Q, on the related information furnished to us by officials of the
Company, or on the financial position, results of operations, or cash flows of IDEX Corporation and
its consolidated
subsidiaries as of any date or for any period subsequent to
December 31, 2008.
Yours truly,
Chicago, Illinois
