Rangefinder

A rangefinder is a device that measures distance from the observer to a target.

Some devices use active methods to measure (such as ultrasonic ranging module, laser rangefinder, radar distance measurement); others measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). Older methodologies that use a set of known information, usually distances or target sizes, to make the measurement, have been in regular use since the 18th century.

单词	Distance meter
释义	Distance meter 英语百科 Rangefinder A rangefinder is a device that measures distance from the observer to a target. Some devices use active methods to measure (such as ultrasonic ranging module, laser rangefinder, radar distance measurement); others measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). Older methodologies that use a set of known information, usually distances or target sizes, to make the measurement, have been in regular use since the 18th century.
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Distance meter

Rangefinder