Metrological calibration testing by an accredited calibration laboratory includes a system of actions to confirm measuring device compliance with adopted metrological standards. Specialists calculate the imprecision, corresponding to the permissible figures noted in a specific measuring instrument’s operational documentation and characteristics.

According to the measuring results of the examination, the following is determined:

  • Condition of measuring instruments
  • Compliance of measuring devices with the requirements specified in the description
  • Validation of measuring devices for operation in the State System for the Provision of Uniform Measurement

Verification can be performed on a mandatory or voluntary basis. Regulations prescribe to make a periodic examination of those measuring devices that are:

  • Used in the State System for Provision of Uniform Measurement
  • Scheduled to be commissioned
  • Used after recent repair works

Mandatory extraordinary verification of the measuring instruments by certified calibrators is required in the case of the following:

  • Verification marking damage (calibration sticker)
  • Readjustment
  • Re-calibration or commissioning after prolonged storage
  • Seal damage

Metrological maintenance of those measuring devices not used for the State System for Provision of Uniform Measurement purposes is carried out through calibration testing and voluntary verification. Federal Law No. 102 regulates conducting the examination.


Improper execution of verification works or non-compliance with the law requirements results in an offense. The penalty will be imposed on metrological service staff who conducted the verification.


Executive authorities conduct metrological supervision. They issue regulations containing the procedure and conditions for the calibration of high-precision instruments.

Only individual entrepreneurs or companies that have successfully passed the calibration accreditation scope to verify measuring instruments can complete the examination. The inspection follows the scheme, and the state authorities approve the methodology, which applies to certain types of measuring equipment.

Measuring instruments should be taken for tests together with the appropriate methodology instruction.

In most cases, experts can quickly obtain the necessary information about the examination rules of measuring devices. Then, the certificate is issued according to the results of the tests, which conclude the suitability of the measuring device.


For a successful verification, the following must be submitted:

  1. Decommissioned measuring instruments produced in and outside the EACU
  2. Manual (operating instructions) for the equipment. If the high-precision device is manufactured outside Russia or the Customs Union, the manual must be translated into Russian
  3. Technical conditions or standards according to which the production of equipment was carried out
  4. The manufacturer’s prospectus in Russian
  5. Results of the measurement report and verification performed in the state where this measuring device was produced. This document is required for the equipment that was purchased outside of the Russian Federation or the EACU by interstate agreement


The following types of tests are prescribed by law:

  1. Primary. Implemented new Russian or non-Russian measuring instruments and equipment after repair and maintenance.
  2. Periodic or secondary. It is required for measurement devices that are in use or stored. It is executed according to intertemporal intervals.
  3. Extraordinary. It is carried out before the next periodic inspection.
  4. Inspection. The State Metrology Service is in operation to verify the correct use of the measuring instrument.
  5. Complex. It includes an examination of the measurement device characteristics as a whole.
  6. Element. The characteristics of the measuring instrument parts are examined.
  7. Sampling. Groups of measuring instruments selected randomly are checked.
  8. Expert. It is required when there are discrepancies in serviceability and quality assurance of the measurement equipment.