1This digital tachometer is a high-quality instrument to measure the RPM with wide measuring range and high resolution. 2It's featured with high accuracy measurement, quick measuring time and long detecting distance up to 500mm/20in with laser. 3This tachometer is very easy to use by applying a reflective point on the target object, then aim at the point by a laser beam. 4It has a wide range of applications, including measuring the rotational speed of machines, motors, model car, wheels, lathes for metal or wood cutting operations. 5The final measurement/minimum is automatically stored in memory and can be displayed at any time. 6With portable design, anti-drop, anti-skid, and anti-static design, suitable for single hand operating with a comfortable feeling.