| DPM | General Directorate of Metrology | Albania |
| BEV | Bundesamt für Eich- und Vermessungswesen | Austria |
| SMD | FPS Economy, DG Quality and Safety, Metrology Division | Belgium |
| IMBiH | Institute of Metrology of Bosnia and Herzegovina | Bosnia and Herzegovina |
| BIM | Bulgarian Institute of Metrology | Bulgaria |
| DZM | State Office for Metrology | Croatia |
| MCIT | Weights and Measures Service / Ministry of Commerce, Industry and Tourism / Cyprus | Cyprus |
| CMI | Czech Metrology Institute | Czech Republic |
| DFM | Danish Fundamental Metrology | Denmark |
| Metrosert | AS Metrosert | Estonia |
| MIKES | VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES | Finland |
| LNE | Laboratoire national de métrologie et d'essais | France |
| PTB | Physikalisch-Technische Bundesanstalt | Germany |
| EIM | Hellenic Institute of Metrology | Greece |
| BFKH | Government Office of the Capital City Budapest | Hungary |
| NEST | Neytendastofa | Iceland |
| NSAI NML | NSAI National Metrology Laboratory | Ireland |
| INRIM | Istituto Nazionale di Ricerca Metrologica | Italy |
| LATMB | LNMC Metrology Bureau | Latvia |
| FTMC | Centre for Physical Sciences and Technology: Metrology Department | Lithuania |
| ILNAS | Bureau luxembourgeois de métrologie | Luxembourg |
| MCCAA-SMI | Malta Competition and Consumer Affairs Authority - Standards and Metrology Institute | Malta |
| MBM | Montenegrin Bureau of Metrology | Montenegro |
| VSL | VSL | Netherlands |
| BoM | Bureau of Metrology | North Macedonia |
| JV | Justervesenet - Norwegian Metrology Service | Norway |
| GUM | Central Office of Measures/Glówny Urzad Miar | Poland |
| IPQ | Instituto Português da Qualidade | Portugal |
| INM-RO | National Institute of Metrology | Romania |
| DMDM | Directorate of Measures and Precious Metals | Serbia |
| SMU | Slovak Institute of Metrology | Slovakia |
| MIRS | Ministry of Economic Development and Technology - Metrology Institute of the Republic of Slovenia | Slovenia |
| CEM | Centro Español de Metrología | Spain |
| RISE | RISE Research Institutes of Sweden AB | Sweden |
| METAS | Federal Institute of Metrology METAS | Switzerland |
| UME | Ulusal Metroloji Enstitüsü | Turkey |
| NPL | National Physical Laboratory | United Kingdom |
