This non-contact tachometer is a professional and practical motor speedometer for measuring revolutions per minute (RPM) with wide measuring range and high resolution. It features high precision measurement,fast measurement time and long sensing distance up to 500inch) with laser.This tachometer is very easy to operate by applying reflective tape ( included in the package) on the target object, then aiming at the mark by laser beam. This tachometer has a wide range of applications, such as measuring machine, motors, wheels, lathe for woodworking or woodworking, electric fan, papermaking, plastics industry, fibers chemicals, washing machines, car manufacturing, etc. Features: Portable non-contact digital photo tachometer with stable performance. Wide measuring range (2.5 rpm to 99999 rpm) & high resolution (0.1 rpm or 1 rpm). Automatically record the MAX. value, Min. value and Last value with low battery indication. Capable of measuring at a distance of 2-20 inches (50-500mm) with large LCD display. 0.8 seconds of sampling time and 5-digit 18mm LCD display with non-contact rpm measurement. Wide usage: generally can be used in the field of motors, wheels, metal lathes, electric fan, papermaking, plastics processing, chemical fibers, washing machines, automobile manufacturing, etc.