A range-finder system is a device used to determine the distance of a target from a point of observation. There are several synonyms for this term, including distance-measuring equipment, range-finding device, distance gauging tool, laser rangefinder, and distance sensor. Each of these terms describes a gadget or instrument used to measure distance accurately, particularly for hunting, sports, military, photography, and engineering. Laser rangefinders use a laser beam to determine the distance of an object while distance sensors can work through sound or light waves to gauge the length between two points. Range-finding devices are essential tools for accurate distance calculations and are available in various shapes and sizes for different applications.