- World Metrology Day is observed annually on 20 May to create awareness about metrology, the science of measurement and its application across the world.
- The day highlights the use of metrology in scientific fields, innovation, industries, business and other fields. The day is the annual celebration of the Singing of the Meter Convention on 20 May 1875.
- The theme of World Metrology Day 2022 is Metrology in the Digital Age.
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