Physikalisch-Technische Bundesanstalt – Wikipedia

The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks.It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Energy.

: https://en.wikipedia.org/wiki/Physikalisch-Technische_Bundesanstalt