The fundament for compliant metering in electric mobility is the already existing law. Consequently to be compliant it is important to fulfill several requirements. If you want to use charging data for billing purposes it is mostly necessary to have calibrated metering. Especially the accuracy of the actual metering needs to be considered. If the data shall be billable in the end the transparency requirements for the user need to be met. In other words the user of the charging station needs to have the possibility to see the progress of his ongoing charging session. After a successful charge the user must be able to verify the session and the correctness of the billed data. To sum up requirements concerning accuracy, transparency and security are the main topics concerning a calibration law compliant charging station.