Generic Digital Photo Laser Tachometer Non Contact Tach RPM Tester 2.5 to 99,999 RPM Wide Measuring Range (99,999 RPM) with High Resolution Long detecting distance up to 500 mm (20 inch) with Laser High accuracy up to 0.05 % With fraction of minute sampling time (0.8 second sampling time) Memory storage with Maximum, Minimum and Last Measured value