Metrology, the science of measurement, plays a central role in scientific discovery and innovation, industrial manufacturing and international trade, in improving the quality of life and in protecting the global environment.
The theme for World Metrology Day 2019 is: The International System of Units – Fundamentally better. This theme was chosen because in November 2018, the General Conference on Weights and Measures agreed one of the largest changes to the International System of Units (the SI) since its inception…
(source BIPM and OIML)
More information on World Metrology Day website.