A laser rangefinder is an instrument that uses a laser to accurately measure the distance between the lines. The laser rangefinder emits a very thin laser beam to the target during operation, and the laser beam reflected by the target is received by the photoelectric element.

If the laser is fired continuously, the measuring range can reach about 40 kilometers, and the operation can be carried out day and night. If the laser is pulsed, the accuracy is generally low, but for long-distance measurement, it can achieve good relative accuracy.

The laser rangefinder is light in weight, small in size, simple in operation, fast and accurate, and its error is only one-fifth to several hundredths of other optical rangefinders, so it is widely used in terrain measurement, battlefield measurement, tanks , ranging from aircraft, ships and artillery objects, measuring the height of clouds, aircraft, missiles and satellites. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. As the price of laser rangefinders continues to drop, the industry has gradually begun to use laser rangefinders. A number of new miniature rangefinders have appeared at home and abroad with the advantages of fast ranging, small size and reliable functions, which can be widely used in industrial measurement and control, mines, ports and other fields.