Definitions for rangefinder
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Princeton's WordNet
rangefinder, range finder(noun)
a measuring instrument (acoustic or optical or electronic) for finding the distance of an object
Wiktionary
rangefinder(Noun)
Any of several designs of optical (or other) instrument that is used to measure the distance to an object
Citation
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"rangefinder." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/rangefinder>.