AR4000 Laser Range Finders are unique distance measuring devices. They employ a modified time-of-flight measurement principle that leads to very fast and accurate measuring speeds. In AR4000, the laser emitter and return signal collection lens are concentric. A collimated beam of laser light is emitted from a diode in the centre of the Fresnel collection lens. Light hits a target and is diffusely reflected, collected by the lens and focussed on an avalanche photodiode.

AR4000 laser rangefinder is the fastest sensor for measuring long distances in its range. With time-of-flight measuring principles, the rangefinder can accurately gauge distances up to 16.45 m.