You restart the scale ten times, getting frustrated. With Manual: You turn to the "Zero Calibration" section. It instructs you to open the calibration switch (often a small screw under a rubber plug), press Zero and Tare simultaneously, and follow the prompt to load a known weight (e.g., 20kg). The problem is solved in 90 seconds.

If you're still interested in finding a service manual or more detailed information about the Digi SM320, try:

: Enter "Z Mode" by pressing the Span Switch , then use the code 8715 to enter Calibration Mode.