May 20 is the World Metrology Day, which is marked on the anniversary of the signing of the Meter Convention in 1875. This agreement provides the basis for a globally coherent measurement system that supports scientific discovery and innovation, industrial production and international trade, as well as improving the quality of life, health and the environment. The theme of World Metrology Day 2021 is “Measurement for Health”. This topic was chosen in order to create awareness of the important role that measurement plays in health, and thus the well-being of each of us

Around the world, national metrological institutes are constantly improving metrology - the science of measurement, development and validation of new measurement methods with less measurement uncertainty. National metrology institutes participate in measurement comparisons coordinated by the International Bureau of Weights and Measures (BIPM) to ensure the reliability of measurement results worldwide.

The International Organization of Legal Metrology (OIML) is developing international recommendations aimed at harmonizing metrological requirements around the world in many areas. OIML also manages the OIML Certification System (OIML -CS) which facilitates international acceptance and global trade in measuring instruments that are subject of legal control. International metrology organizations provide the necessary confidence in measurement results, providing a sound basis for today’s global trade and helping us prepare for future challenges. World Metrology Day recognizes and celebrates the contribution of all people working in intergovernmental and national metrology organizations and institutes around the world.