Calibration is a set of operations that establish, under specified conditions, the relationship between the values of quantities indicated by a measuring instrument and the corresponding value of the physical quantity realised by measurement standards (§2 (1) (6) “Metrology Act”).

The purpose of calibration is to ensure reliable measurement results. The calibration procedure is determined by an organisation itself based on its requirements.

Metrosert provides calibration services for over 200 types of measuring instruments: volume, mass, force, torque, geometric values, pressure, temperature, heat energy, time, frequency, electrical quantities and flow meters.

The reliability of calibration results of AS Metrosert is guaranteed by the shortest traceability chain in Estonia to SI units of an international measurement standard.

The calibration services of Metrosert are confirmed by an accreditation certificate issued by the Estonian Accreditation Centre.


In addition to calibration, Metrosert offers conformity assessment.

The objective of conformity assessment is to assess the conformity of a measuring instrument to the metrological parameters established in normative documents.

The conformity assessment result is presented instead of or with calibration results and the measurement uncertainty.

A normative document can be an international standard, manufacturer’s specification, requirements for the measuring instrument established by the customer, etc.

Types of measuring instruments