The main difference between MID and ME devices is the validity of their meter data. ME devices have a built-in long-term memory in which the ME-relevant measurement data sets are stored. With an OCPP connection, these are also transmitted to the backend. In Germany, measured values from MID devices do not form a legally valid basis for charging energy costs to third parties. Energy meters that can be used for further billing must comply with the measurement and calibration law (ME). In Germany, measured values from MID or non-verified meters are used for information purposes only.