A laser rangefinder or laser distance meter is an optical device that measures the distance of an object using a laser beam. It consists of a pulsed laser and a photodetector. The distance to the object is determined "indirectly", by measuring the time it takes for the beam to travel to the object and back. That is, by measuring the time difference from the generation of the pulse to its reception, while other techniques such as the measurement of the phase difference of continuous modulated laser radiation are used for measurements with greater precision than centimeters. The laser range finder is used as a tool for contractors of various construction works, in geodesy and industry. In the military, it is used as a sighting device on a sniper and allows the sniper to measure the distance to the target, as well as in fighter aircraft as part of a sensor system for positioning a detected target.a
