Authorized calibration laboratories responsible for subsequent metrological controls on electric meters and measurement systems used for tax purposes are specialized entities that play a crucial role in ensuring the accuracy and reliability of electrical energy measurements.

These laboratories conduct periodic inspections and calibrations of electric meters and measurement systems, ensuring that these instruments comply with the metrological requirements established by law. They perform subsequent metrological controls, meaning verifications that take place after the instruments have been put into service, to confirm their compliance over time. Finally, they issue calibration certificates that certify the conformity of the instruments with current regulations.