The radar is calibrated by a technician in a shop somewhere. He fills out a certification for that unit, including the serial number of the unit and tuning forks assigned to that unit. The officer uses the tuning forks to check the calibration at the beginning of every shift. The officer is usually not qualified to calibrate a radar.
That is a little more like it. And let's not forget to check it after your shift to ensure it remained calibrated
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