BIPM – The International Bureau of Weights and Measures

http://www.bipm.org/en/about-us/

EURAMET – The European Association of National Metrology Institutes

https://www.euramet.org/

The European Metrology Research Programme (EMRP)

https://www.euramet.org/research-innovation/emrp/

The European Metrology Programme for Innovation and Research (EMPIR)

https://www.euramet.org/research-innovation/research-empir/

European Partnership on Metrology

https://www.euramet.org/research-innovation/metrology-partnership

EA – European Accreditations

http://www.european-accreditation.org/

ILAC – The international organisation for accreditation bodies

www.ilac.org

ISO TC164/SC3 – Hardness Testing

https://www.iso.org/committee/53558.html

CODATA Internationally recommended values of the Fundamental Physical Constants

http://physics.nist.gov/cuu/Constants/index.html