SM2235A Digital Contact Surface Tachometer High Speed RPM Meter Auto Ranging Backlight Data Hold

Features: 1, The tachometer uses microcomputer(CPU) technique; anti-jamming technique for contact measurement of rotation speed(RPM) surface speed(m/min) and contact length(m) 2,Wide measuring range and high resolution 3,Large screen LCD display provides clear reading 4, White back light guarantee reading in any light environment 5,Automatically save max, min and last value, also save 96 set of continuous data(the tachometer starts to store data after refreshing measuring data) 6,Low battery voltage indication 7,Surface speed wheel with groove to test surface speed or length of wire, cable, or rope conveniently. 8,Smooth housing design, comfortable to hold and use 9,The instrument is delicate and rugged, It uses the durable, long-lasting components and a strong, light weight ABS plastic housing Specification: -5 digits 18mm(0.6'') white backlight LCD -Accuracy: (0.05%+1digit) -Sampling time:0.5sec(over 120RPM) -Range Select: Auto-Switch -Memory: Max. value, Min value, Last value, can store 96s data -Measuring range: contact tach:0.5~19999RPM Surface speed: 0.05~1999.9m/min Contact length: 0.05~99999m -Power-consumption: Approx 45mA -Resolution: 0.1RPM(2.5~999.9RPM) 1RPM(over 1000RPM) -Time base: 6MHz Quartz crystal -Time base accuracy: 10x10-6(0-500C) -Resolution: contact tach: 0.1RPM(0.5~999.9RPM) 1RPM(over 1000RPM) Surface speed: 0.01m/min(0.5~999.9RPM) 0.1m/min(up to 100m/min ) Contact length: 0.02m(0.05~99999m) -Power:3x1.5v AA battery(not included) Package includes: 1 x Photo tachometer(Batteries not inclued) 1 x English user manual 2 x reflective strip Details pictures: