The DAkkS/DKD calibration for the Charged Plate Set EFM 51 represents an essential service to ensure the precision and reliability of the measuring device. This calibration is specifically designed for the EFM 51 and can only be performed in conjunction with this device. The need for regular calibration arises from various factors such as frequency of use, specific operating conditions, and the requirements of relevant standards and manufacturer specifications. Recommended calibration intervals typically vary between one and three years, depending on the type of device. The device must be sent in for calibration. Upon completion of the calibration, customers receive a certificate confirming compliance with the required standards and the correct functioning of the EFM 51.