A rangefinder, also known as a rangefinder telemeter, is an advanced optical device used to measure the distance to a remote object. Most rangefinders are used in photography, hunting and the military. ThankBuy is the top online resource for all laser rangefinders, the best laser rangefinders on sale are specifically designed for hundreds of applications that require measuring distance, speed, slope and angle. There are tons of styles to choose from, there's always one you like. Laser rangefinders are incredibly accurate, high-tech devices that use a laser beam to determine the distance to a target. The exact answer can be given to a hunter or golfer.