Below are links to various articles and videos about metrology. They are worth reading and viewing.
This article contains several videos about the redefinition of the units. A turningpoint for humanity: redefining the world's measurement
SI unit 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
SI unit Kelvin
SI unit Second
SI unit Mol
Two movies about the mole. The mole
Calibrating a Micropipette
On 4 april 2018 CALLAB Magazine published my contribution on pipette calibration.
This paper discusses the calibration of pipette, with particular attention to the type that is used and calibrated most frequently. This is the so-called air-displacement pipette, single channel, adjustable volume pipet. The new ISO/IEC 17025, published November 2017, demands more attention to the agreement of the calibration procedure with the customer. The paper describes points that need to be agreed with the customer and calibration by the gravimetric method (weighing). The alternative calorimetric method (ISO 8655-7) is not described in this paper. Read the full article (PDF)