To view the current calibration information for your hand punch, press the */NO button 11 times (FYI: 10 times shows you the serial number). You will see three readings; perfect readings are r0 c0 e100. Acceptable ranges for the r and c figures are between -3 and 3. For the e reading you want something between 80 and 130.
If employees are having matching issues and you see that any of the calibrations are outside of the above ranges a device service may be necessary to resolve the problem.