The DAkkS/DKD calibration for the electric field meter EFM51 is an essential service to ensure the accuracy and reliability of the measuring device over time. This calibration is particularly important for applications where precise measurements are crucial. The service includes the inspection and adjustment of the device, which must be sent to the service provider. Upon completion of the calibration, customers receive a certificate confirming compliance with the specified standards. The need for such calibration arises from various factors, including the frequency of use of the device, the specific operating conditions, and compliance with relevant standards and manufacturer specifications. The recommended intervals for calibration vary depending on the type of device and can range from one to three years, depending on the internal guidelines for test equipment monitoring.