A range finder is a device used to measure the distance from the observer to a specific target. It works by emitting a signal, such as a laser or sound wave, and calculating the time it takes for the signal to return after hitting the target. This technology is commonly used in various fields, including hunting, golf, and surveying. There are two main types of range finders: optical and electronic. Optical range finders use lenses and reticles to estimate distance visually, while electronic range finders provide precise measurements using laser technology. Both types help users make informed decisions based on accurate distance data.