Physikalisch-Technische Bundesanstalt (PTB)

Address
Bundesallee 100
38116 Braunschweig
Germany
National Standards in
Acoustics, Ultrasound and Vibration
Electricity and Magnetism
Flow
Ionising Radiation
Length
Mass and Related Quantities
Metrology in Chemistry
Photometry and Radiometry
Thermometry
Time and Frequency