Rangefinder

A rangefinder is a device designed to measure the distance between the user and a target. Modern rangefinders use a laser beam that bounces off the object, and the device measures the time it takes for the light to return. Based on this, the exact distance is calculated — usually with decimeter accuracy. Rangefinders are used in the military, hunting, sport shooting, surveying, construction, and outdoor activities. Airsoft players use them as well, especially snipers and command roles. A rangefinder is therefore a precise measuring instrument used to determine the distance to a target. Modern laser rangefinders evolved from 19th-century optical methods and have become essential equipment for military shooters, reconnaissance units, and snipers. In airsoft, a rangefinder is most useful for snipers and players tuning their guns — it helps accurately measure effective range and judge distance for precise aiming.

Who invented the rangefinder?

The first mechanical rangefinders appeared in the 19th century. Among the earliest were stadia and optical rangefinders used by artillery and naval forces. The modern laser rangefinder dates back to the 1960s — the first functional model was developed shortly after the invention of the laser (1960) and was quickly adopted by the military for precise long-distance measurement.

What were the predecessors of modern rangefinders?

Optical stereoscopic rangefinders — using two lenses and triangulation.
Stadiametric reticles — estimating distance based on the known size of an object inside the reticle.
Theodolites and simple triangulation methods.
Artillery range-measuring devices used on ships and large guns.

Laser rangefinders replaced these older technologies thanks to their speed, simplicity, and high accuracy.

Why do soldiers use rangefinders?

In the military, precise distance measurement is essential for:

accurate long-range shooting,
artillery guidance and fire correction,
reconnaissance and planning troop movement,
locating enemy positions and transmitting exact coordinates.

Sniper teams routinely use laser rangefinders as part of their observation optics (rangefinder binoculars or spotting scopes with integrated ranging).

Does a rangefinder have use in airsoft?

Yes, although not as critically as in real firearms shooting. In airsoft, a rangefinder helps mainly with:

airsoft snipers determining target distance,
setting hop-up and effective range when tuning guns,
training holdover for longer-distance shots (50–90 m),
team leaders planning movement and communicating distances.

In airsoft, it's not about ballistic drop like with real rifles, but about a realistic understanding of effective range and choosing the right aiming trajectory (holdover). A rangefinder helps significantly with this.