A radar distance-measuring device is a product used in the field and measures the distance from the instrument to a point or object. It can be divided into passive measuring devices and active measuring devices. A passive measuring device measures the distance to an object using the parallax that occurs when looking at an object at the same time. Passive measuring devices include the coincidence type, which is mainly used for cameras and surveying, and the stereoscopic type, which is useful for measuring the distance of moving objects and is used to measure the shooting distance. Active measuring devices include a radar distance-measuring device and a laser distance-measuring device.