The MID applies to 10 types of measuring device (electricity meters, water meters, gas meters, etc.) in the fields of statutory metrology, and defines fundamental and measuring device-specific requirements.
A conformity evaluation process – whereby the cooperation of a notified body chosen by the manufacturer is prescribed – replaces the previous first calibration by the calibration authority or the state-certified test centre.
It transfers the responsibility for first circulation and first commissioning within the EU to the manufacturer. After this, national law applies.
The manufacturer must select one of the conformity evaluation processes prescribed in the MID, through which they guarantee the compliance of the measuring device with the MID under the supervision of a notified body. Only then is it permissible to put the measuring device - compliant with the MID - into circulation or into operation. A declaration of conformity must be supplied with the meter.This is frequently printed in the operating manual.
Following circulation or commissioning of the measuring device, the responsibility for attaining accurate measuring results passes to the user.