ProfessionTachometer Digital LCD Tachometer Laser Non-Contact Tach Range 2.5-99999RPM Motor Speed Gun Style Speed Meter Description: Mini handheld gun type design Automatic and manual measurement selectable Data record and recall MAX/MIN/AVG record function Record time interval setup function LCD with backlight Data hold function Auto and mamual power off battery indication Specifications: Measuring Range:2.5-99999RPM Resolution:0.1RPM,at 2.5~ .9RPM;1RPM,at 1000~99, RPM Accuracy:±0.02% 1digtal Measuring distance:50~500mm Sampling Time:0.5s(above120RPM) Operation temperature:0 to 50oC(32 to 122oF) Operation humidity:10 to 90%RH Storage temperature: -10 to 60oC(14 to 140oF) Storage humidity:10 to 75%RH Dimension:145*90*35mm Power supply: 9V battery(battery not include)   Specifications: Mini handheld gun type design Automatic and manual measurement selectable Data record and recall MAX/MIN/AVG value record function Record time interval setup function LCD with backlight   Package Included: 1*Digital Tachometer