Every single piezoelectric sensor is calibrated before shipment and supplied with an individual calibration record. In special cases the sensors are calibrated directly at the customer's site. Each calibration setup is done according to national and international standards and each calibration result is stored on a secure server, so that after many years of use, the calibration value of the sensor can still be compared to the original values. In order to achieve the most informative calibration results, critical sensors are pre-aged under realistic conditions and then calibrated after a run-in phase. For this purpose Piezocryst maintains specific loading systems, such as test motors or high-temperature pressure-pulsation systems, with which the sensors are retracted.