Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in this Amendment No. 1 to Registration Statement on Form S-8 of our report dated December 7, 2006 relating to the financial statements, financial statement schedule, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in OYO Geospace Corporation’s Annual Report on Form 10-K for the year ended September 30, 2006.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

May 23, 2007