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)
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Merriam-Webster unabridged
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Time Traveler for range finder
The first known use of range finder was in 1872
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