Feature:1.Mine Handheld Gun Type Design2.Wide Range of Measurement and High Resolution3.Automatic & Manual Measurement Functions4.Data Record and Recall (60 Readings Max)5.Max/Min/Avg Value Record Function6.Record Time Interval Setup Function7.LCD with White Backlight8.Data Hold Function9.Auto & Manual Power Off10.Low Batter Indication11.CE & RoHS Compliant12.Ideal for applications where a tachometer would be unsafe to use or will not reach.13.Just apply some of the supplied reflective material to the moving part and point the tachometer at it.14.The tachometer measures how often the reflective tape passes in a given time and calculates the rpm.Specifications:1.Measuring Range: 2.5 - 99999 RPM2.Resolution: 0.1 RPM at 2.5-999.9RPM / 1 RPM at 1000 - 99,999 RPM3.Accuracy: ±0.02% + 1 Digit4.Measuring Distance: 50 - 500mm5.Sample Time: 0.5s (above 120 RPM)6.Operational Temperature: 0 to 50 Deg. C (32 to 122 Deg. F)7.Operation Humidity: 10 to 90%RH8.Storage Temperature: -10 to 60 Deg. C (14 to 140 Deg. F)9.Storage Humidity: 10 to 75% RH10.Dimensions: 145*90*35mm