Extech 461950 Panel Mount Tachometer

Continuous & accurate readings from 5 to 99,990rpmMeasure rpm from 5 to 99,990rpm with microprocessor quartz crystal accuracy of 0.05%Large LED display updates 1/sec (rpm<60)Resolution: 0.1rpm (5 to 1000rpm), 1rpm (1000 to 999rpm), 10rpm (10,000rpm to 99,990rpm)Unique design permits rpm measurements of a one hole gear or disk eliminating the need for special gears;