There isn't a speed gun used for Bowling. There are two light
sensors that either are placed about 10-15 feet in front of the
lane or in the pin deck area. The ball speed is determined
calculating the time between when each sensor has been tripped.
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More answers
A radar gun or speed gun is used to clock the speed of a bowling
ball. It works by what is called Doppler effect or Doppler shift.
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