Exhibit 23.1

                         Consent of Independent Auditors

We consent to the incorporation by reference in the Registration Statement (Form
S-8 No. 333-89214) pertaining to the Directors Stock Option Plan, Management
Stock Option Plan, and Key Employee Stock Option Plan and (Form S-8 No.
333-69342) pertaining to the IPO Leveraged Share Plan of INFICON Holding AG of
our report dated January 25, 2002, with respect to the consolidated financial
statements and schedule of INFICON Holding AG included in the Annual Report on
Form F-20 for the year ended December 31, 2003.


                                                /s/ Ernst & Young LLP

Buffalo, New York
March 25, 2003