range finder

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.
Also, rangefinder.


Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
range finder

noun
a measuring instrument (acoustic or optical or electronic) for finding the distance of an object [syn: rangefinder
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
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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