Institutul National de Metrologie
http://www.inm.ro

International Organization of Legal Metrology
http://www.oiml.org

National Institute of Standards and Technology
http://www.nist.gov

Physikalisch: Technische Bundesanstalt (PTB)
http://www.ptb.de

Bureau International des Poids et Mesures
http://www.bipm.fr

Laboratoire national de métrologie et d'essais
http://www.bnm.fr

European Collaboration in Measurement Standards
http://www.euramet.org

National Physical Laboratory
http://www.npl.co.uk

NMI
http://www.nmi.nl