The general theory of measurements and the evaluation of their validity (Theoretical Metrology) is continuously developing. It includes measurement processes and their elements: measurable quantities, their units, measurement tools and methods, measurement conditions, and the analysis and study of measurement results, as well as the data and generalizations obtained.

With the development of science, there was a transition from the random selection of units and quantities to the creation of systems of units. Metrology studies the principles of building systems of physical quantities and their units, as well as the theoretical aspects of precise unit systems.

Today, the International System of Units (SI), officially adopted by more than one hundred countries, is widely used. Theoretical metrology is devoted to methods for evaluating measurement accuracy (measurement errors) and uncertainty. Probability theory, mathematical statistics, and other branches of mathematics are widely applied.

To achieve measurement uniformity, all measuring instruments used must be correctly calibrated and periodically verified or calibrated. For this purpose, standards of measurement units — special technical devices with high stability and precision — are used to reproduce units and transfer them to other measuring instruments.

The metrology laboratory is a specialized scientific and technical department whose activities are aimed at creating the necessary conditions for accurate and reliable measurements and monitoring the condition of measuring instruments used in various fields of human activity.

Our organization provides qualified metrological services to the public, enterprises, and organizations, including:

- high-quality repair of various types and models of gas meters; - verification and certification of household and industrial gas meters; - calibration and certification of gas meters; - calculation and approval of flow-restricting devices (diaphragms); - manufacturing and certification of flow-restricting devices (diaphragms); - attestation and certification of gas flow measurement devices; - provision of software;