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radar gun

noun
1.
a small, handheld Doppler radar device used to measure the speed of vehicles or other moving objects.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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radar-gun in Science
radar gun  
A usually hand-held device that measures the velocity of a moving object by sending out a continuous radio wave and measuring the frequency of reflected waves. See more at Doppler effect.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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