range finder

noun

Definition of range finder

1 :an instrument used in gunnery to determine the distance of a target
2 :a surveying instrument (such as a transit) for determining quickly the distances, bearings, and elevations of distant objects
3 :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)

First Known Use of range finder

1872


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