range finder

or range·find·er

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noun

any of various instruments for determining the distance from the observer to a particular object, as for sighting a gun or adjusting the focus of a camera.

Origin of range finder

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for range finder

Historical Examples of range finder