To calibrate the Salter Brecknell PB-500, follow these steps:
- Press and hold the "ZERO" key until the display shows "CAL".
- Press the "UNIT" key to confirm calibration.
- The display will then show "MODE" and you can adjust the calibration weight using the arrow keys.
- Once the correct weight is displayed, press the "PRINT" key to save the calibration.