Laser Rangefinder

A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object. The most common form of laser rangefinder operates on the time of flight principle by sending a laser pulse in a narrow beam towards the object and measuring the time taken by the pulse to be reflected off the target and returned to the sender. Due to the high speed of light, this technique is not appropriate for high precision sub-millimeter measurements, where triangulation and other techniques are often used instead. Laser rangefinders are sometimes classified as type of handheld scannerless lidar.

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Humidity, snow, dust, or other airborne particulates will diffuse the signal.
Higher temperature and higher pressure (lower elevation) slightly decrease the speed of light through air.
Smaller and less reflective targets return less information.
In good conditions, skilled operators using precision laser rangefinders can range a target to within a meter at distances on the order of three kilometers.