Below are links to various articles and videos about metrology. They are worth reading and viewing.
Explanation daily measurements and SI units
Largest overhaul of scientific units since 1875 wins approval
This article contains several videos about the redefinition of the units. A turningpoint for humanity: redefining the world's measurement
You know kilo, mega, and giga. Is the metric system ready for ronna and quecca?
Universal units reflect their earthly origens
World Metrology Day: How NASA Lost a Satellite
SI unit Kilogram
Unit of the month May 2019: kilogram
Interesting article. don't forget to click on the link. "Learning with: the kilogram is dead, long live the kilogram."
Good movie about the silicion sfere with dutch subtitles World's roundest object
For our Spanish visitors: Desde hoy rige la nueva definición del kilogramo y entran en vigencia las nuevas unidades de medida
SI unit Meter
Countdown to the SI redefinition: the meter
SI unit Kelvin
The Kelvin is the SI base unit for thermodynamic temperature
SI unit Second
Newest atomic clocks can detect the gravitational distortions of time itself
Atomic clock performance enabling geodesy below the centimetre level
SI unit Mol
Two movies about the mole. The mole