0 Metrology is the exact of all exact sciences. It is dedicated to measurements. Her data is generally accepted and undeniable. All spheres of human life related to measures and weights from trade to the protection of nature depend on this. The motto of World Metrology Day 2020 “Measurement for international trade” was chosen to show the important role that measurements play in promoting fair international trade, removing technical barriers, ensuring that products meet standards and regulations, and meeting consumer quality expectations.