Radar-gun meaning

A usually handheld device that measures the velocity of a moving object by sending out a continuous radio wave and measuring the frequency of reflected waves.
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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.
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A hand-held (mounted) device that emits a radar beam and uses the Doppler effect to measure the velocity of moving objects (especially traffic)
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