radar gun

a small, handheld Doppler radar device used to measure the speed of vehicles or other moving objects.
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American Heritage
Science Dictionary
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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Example sentences
Radar gun emits a continuous stream of microwaves at a preset frequency.
No one had a radar gun on this to find the speed of the ball.
The result is a radar gun display that is either totally inaccurate or blank.
When going across the freeway, there were exhibits about how a road is
  constructed and also how a radar gun works.
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