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Measure speed by sending pulses of microwave radiation out towards a target, usually in a conical shape. The device then 'listens' for a bounced back reflection of the radiation, measuring the time between emitted and reflected pulses. After some complicated maths, the in-built computer calculates the speed of the projectile (such as a ball or puck).

Basic radar guns cost around £100 / US$200

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Q: Cricket radar guns
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