How do you calibrate a nortron 7402-116 wheel balancer?

To calibrate a Nortron 7402-116 wheel balancer, first ensure that the machine is on a level surface and powered on. Next, select the calibration mode using the machine's control panel, then follow the prompts to input the required parameters, which may include wheel size and weight. Place a test weight on the balancer as instructed, and allow the machine to perform the calibration process. Once complete, confirm that the displayed values are accurate and adjust if necessary, following the manufacturer's guidelines.