EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-118260, 333-104083, 333-55820, 333-31636 and 333-52661) of Mettler-Toledo International Inc. of our report dated February 15, 2007 relating to the financial statements, financial statement schedules, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/  PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Columbus, OH

February 15, 2007