20th of May marks World Metrology Day, which commemorates the anniversary of the signing of the Metre Convention in 1875. The theme for World Metrology Day 2019 is The International System of Units - Fundamentally better.

This theme was chosen because on 16 November 2018, the General Conference on Weights and Measures agreed to base the SI definitions on the laws of physics - which has the advantage of being able to embrace further improvements in measurement science and technology to meet the needs of future users for many years to come.

Across the world, national metrology institutes continually advance measurement science by developing and validating new measurement techniques at whatever level of sophistication is required. These institutes participate in comparisons coordinated by the Bureau International des Poids et Mesures (BIPM) to ensure the worldwide reliability of measurement results.

World Metrology Day recognizes and celebrates the contribution of all the people that work in intergovernmental and national organizations throughout the year on behalf of all.