A rangefinder is a device used to measure the distance from the observer to a target. It can be optical, laser, or GPS-based, and is commonly used in various fields such as photography, hunting, and surveying. By providing accurate distance measurements, rangefinders help users make informed decisions, whether it's framing a shot or determining the range for a shot. Laser rangefinders are particularly popular due to their precision and ease of use. They work by emitting a laser beam towards the target and measuring the time it takes for the beam to return. This technology is widely utilized in sports, such as golf, where players need to know the distance to the hole, and in military applications for targeting purposes.