RANGEFINDERS

A rangefinder is an instrument that can give the distance between a user and a specific visible point. A rangefinder may make use of a technology such as sonar or lasers, or may use basic mathematics to determine the distance based on objects in the field of view. The laser rangefinder is probably the most popular form of rangefinder available today. A laser rangefinder works on a similar principle to sonar, by sending a narrow laser beam at the target and measuring the time it takes for the beam to bounce back.