updated 5/10/2010 9:56:35 AM ET 2010-05-10T13:56:35

Keithley Instruments Inc., maker of electrical test instruments and systems, said Monday its board of directors tripled the quarterly dividend.

The board boosted the dividend to 3.75 cents from 1.25 cents.

It also tripled the dividend for Class B shares to 3 cents from 1 cent.

The dividends are payable June 30 to shareholders of record at the close of business on June 16.

Shares of Keithley Instruments rose $1.01, or 12 percent, to $9.40 in morning trading.

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