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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World English Dictionary
rangefinder (ˈreɪndʒˌfaɪndə)
 
n
1.  an instrument for determining the distance of an object from the observer, esp in order to sight a gun or focus a camera
2.  another word for tacheometer

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for rangefinder
It was the first leica to combine rangefinder and viewfinder into one window.
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