You find the certificate of the last calibration in the menu at >Settings >Information > Calibration.
The CANtouch® is maintenance-free. For some measured values (Technical Specifications), calibration including adjustment is performed during the manufacture of the device. The calibration certificate is stored electronically on the device. Regular calibration is not necessary. In the case of customer-specific requirements, a new calibration with adjustment can be carried out by the manufacturer. Therefore a printable calibration certificate (PDF) is optionally available.