Keithley Instruments announced results for its fiscal 2009 third quarter 2009. Net sales were $23.4 million, a decrease of $17.5 million, or 43 percent, from net sales of $41.0 million in last year’s third quarter. Net sales decreased two percent compared to the second quarter of fiscal 2009. The Company reported a net loss of $3.4 million, compared to a net loss of $39,000 during last year’s third quarter.