International : International Organization of Legal Metrology (OIML) oiml.org

United States : National Institute of Standards and Technology (NIST) nist.gov

Canada : NRC-Institute for National Measurement Standards, cisti.nrc.ca

Chile : Center of Studies, Measurements and Quality Certification – cesmec.cl

Australia : Commonwealth Scientific and Industrial Research Organisation, csiro.au

Denmark : Danish Fundamental Metrology, dfm.dtu.dk

Estonia : Estonian Centre for Standardization, evs.ee

Finland : tukes.fi

France : Laboratoire National de Metrologie et d’Essals; metrologiefrancais.com

Germany : Physikalisch-Technische Bundesanstalt (PTB)  ptb.de

Hungary : National Office of Measures omh.gov.hu

Iceland : Icelandic Metrology & Accreditation, skima.is

Ireland : National Metrology Lab netc.ie/techserv/metrology.html

Italy : National Institute of Metrological Research inrim.it

Japan : National Institute of Metrology in Japan, nmij.jp

Korea :Korea Research Institute of Standards and Science kriss.re.kr

Luxembourg : Service de Metrologie’

Malaysia : Standards and Industrial Research Institute, sirim.my

Netherlands : Nederlands Meetinstituut, nmi.nl

Norway : Norwegian Metrology and Accreditation Service (Justervesenet) justervesenet.no

Poland : Polish Central Office of Measures, gum.gov.pl

Romania : Romanian Bureau of Legal Metrology

Saudi Arabia : Saudi Arabia Standards Organization, saso.org.sa

Singapore : Institute of Standards and Industrial Research, psb.gov.sg

Slovenia : Standards and Metrology Institute, usm.mzt.sl

South Africa : National Metrology Laboratory of South Africa, nmisa.org

Sweden : Swedish National Testing and Research Institute, sp.se

Switzerland : Swiss Federal Office of Metrology, metas.ch

Taiwan : National Metrology Laboratory, nml.org.tw

United Kingdom : National Physics Laboratory, nwml.gov.uk