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range finder

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
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for range finder
  • Distances can be determined by a measuring tape, range finder, or by pacing.
  • The distance measurements will be noted using a laser range finder.

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