Laser rangefinder is an instrument that uses a parameter of modulated laser to measure the distance of the target. The measuring range of the laser rangefinder is 3.5~5000 meters. According to the ranging method, it can be divided into phase method ranging instrument and pulse method ranging instrument. Pulse type laser ranging instrument is to shoot a beam or a series of short pulse laser beams to the target when working, and the laser beam reflected by the target is received by the photoelectric element. The timer measures the time from the laser beam to the receiving, and calculates the distance from the observer to the target.

As the price of laser rangefinders has been continuously reduced, laser rangefinders have gradually been used in industry. At home and abroad, a number of new micro-distance meters with the advantages of fast ranging, small size and reliable performance have emerged, which can be widely used in industrial measurement and control, mines, ports and other fields.