Tuning Fork to calibrate the Sports Radar SR-3500/ SR-600 Baseball Speed Gun, and the Remote Display. Both units come calibrated, and rarely get out of calibration. However, if they ever get out of calibration, the tuning fork is how they are calibrated. Instructions come with the tuning fork as to how it is used. The Tuning Fork to calibrate the speed of the Sports Radar SR-3500 Baseball Speed Gun.
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Both units come calibrated, and rarely get out of calibration. However, if they ever get out of calibration, the tuning fork is how they are calibrated. Instructions come with the tuning fork as to how it is used. 
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