Display: 18mm high 5-digit LCD screen Test Range: 2.5 RPM ~ 99,999 RPM (RPM) Resolution: 0.1 rpm (revolution/minute) (2.5 ~ 999.9 rpm) 1RPM (revolution per minute) (above 1000RPM) Measurement accuracy: (0.05% +1) Sampling time: 0.8 seconds (above 60 rpm) Effective Measuring Distance: 50mm~500mm (Laser Light Source) Timebase: 6 MHz Crystal Oscillator Range selection: automatic switching Power supply: single 6F22 9V battery (not included) Power consumption: about 35mA Instrument size: 131 70 29 mm Automatically remember the maximum, minimum and last measured value Automatic zero setting, these deposits, allows you to read back saved data and minimum and maximum values at any time. Tachometer via a beam of red light screws ...