Under Georgia law, an officer is not required to show the defendant the speed detection device. When dealing with radar speed enforcement specifically, the officer is required by law to ask if you would like for a calibration check of the unit. That check is done by the use of calibrated tuning forks which is used to verify that the counter unit in the device is operating properly.
If requested, the officer is obligated by law to perform that calibration check and inform the defendant of the results. The offender is not entitled to witness this check nor are they entitled to see the radar display. This does not apply to LIDAR (Laser) speed detection devices because the calibration checks for these units cannot be performed roadside.