Features:Large LCD displayingWide measuring range & high resolution.Digital display gives exact RPM with no guessing or errors.The last value/max. value/min. value will be automatically stored in memory and can e displayed by turn anytime.The use of durable， long-lasting components， including a strong， light weight ABS-plastic housing assures maintenance free performance for many years. The housing has been carefully shaped to fit comfortable in either hand.Specifications:Display: 5 digits， 18mm (0.7") LCD (Liquid Crystal Display)， with function annunciation.Teat Range: 2.5 to 99，999 RPM (r/min).Resolution: 0.1 RPM (2.5 to 9，999 RPM ). 1RPM (over 1，000 RPM).Accuracy: ?��(0.05%+1 digit).Sampling Time: 0.8 sec.(over 60 RPM).Test Range Select: Automatic.Menory: Last value， Max. Value， Min. Value.Detecting Distance: 50 to 200mm/2 to 10 inch (LED)， 50 to 500mm/2 to 20 inch (Laser)Time Base: Quartz crystal.Circuit: Exclusice one-chip of microcomputer LSI circuit.Power supply: one 6F22 9V battery(Included)Power Consumption: Approx. 35mA (LED) Approx.30mA(Laser)Operation Temp: 0 to 50??C (32 to 122??F)Color: gray with orangePackage Includes: 1X DT-2234C+ Digital Laser Photo Tachometer Non Contact RPM Tach Meter Tester1X Carrying case3X 200mm Reflecting tape marks1X Operation manual1X 6F22 9V Battery