rangefinder
noun(range finder)
an instrument used in gunnery to determine the distance of a target
rangefinder
noun(range finder)
a surveying instrument (such as a transit) for determining quickly the distances, bearings, and elevations of distant objects
rangefinder
noun(range finder)
a usually built-in adjustable optical device for focusing a camera that automatically indicates the correct focus (as when two parts of a split image are brought together)