Item 2.02 Results of Operations and Financial Condition.

In the last sentence of the third paragraph of Keithley Instruments, Inc.'s April 29, 2009 press release, "Keithley Instruments Reports Results for Fiscal 2009 Second Quarter," the Company's quarterly period referenced with respect to its recorded GAAP operating loss of $10.1 million should have been the second quarter of fiscal 2009 not the first quarter of fiscal 2009. The complete, corrected release is attached as Exhibit 99.

The information contained herein and in the accompanying exhibit shall not be incorporated by reference into any filing of the Registrant, whether made before or after the date hereof. The information in this report, including the exhibit hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended.

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits.
99. Corrected Press Release Dated April 29, 2009

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