Telescope Rangefinder or Golf Rangefinder is a measuring instrument that integrates observation and measurement. It combines a laser rangefinder with a telephoto system. The laser rangefinder is composed of a telescope system, a laser emission module, a laser detection module, a data processing module, a man-machine interface module and a communication module.

Golf rangefinders are designed to help the golfer estimate distance and accuracy of their shot. The estimation will help improve their game by letting the golfer know how hard they should hit the ball.