1. Laboratorios Nacionales de Metrologia:

•Red Nacional de Metrología - Chile
•Physikalisch-Tecnische Bundasanstalt
•Centro Nacional de Metrología - México
•SP Swedish National Testing and Research Institute
•National Physical Laboratory - UK
•Danish Institute of Fundamental Metrology
•National Institute of Standards and Technology - USA -•Thermometry Group
•Servicio Nacional de Metrología de INDECOPI - Perú
•Departamento de Patrones Nacionales de Medida de INTI - Argentina
•Bureau National de Métrologie - Francia
•Laboratorio Tecnológico de Uruguay (LATU)
•Sección de Metrología Científica e Industrial de INMETRO - Brasil
•BEV-Bundesamt für Eich- und Vermessungwesen - Austria
•National Institute of Metrology - Thailand

2. Asociaciones de Metrologia:

•NCSL International
•Metrology Society of Australia
•International Measurement Confederation (IMEKO)
•Sociedade Brasileira de Metrologia
•Co-Operation on International Traceability in Anaytical Chemistry

3. Organismos Regionales de Metrologia:

•Bureau International des Poids et Mesures (BIPM) -
•The BIPM key comparison database (KCDB)
•Sistema Interamericano de Metrología (SIM)
•European Collaboration in Measurement Standards (EUROMET)
•EURACHEM
•Euro-Asian Cooperation of National Metrological Institutions (COOMET)
•Southern African Development Community Cooperation in Measurement Traceability (SADCMET)
•Asia Pacific Metrology Program (APMP)

4. Organismos de Acreditación:

•Sistema Nacional de Acreditación (SNA/INN) - Chile
•Deutscher Kalibrierdienst (DKD) - Alemania
•German Accreditation Council (DAR) - Alemania
•National Voluntary Laboratory Accreditation Program (NVLAP) - US
•United Kingdom Accreditation Service (UKAS)
•Comité Français d'Accréditation (COFRAC)
•Standards Council of Canada
•International Laboratory Accreditation Cooperation (ILAC)
•Interamerican Accreditation Co-operation (IAAC)
•European co-operation for Accreditation (EA)
•National Association of Testing Authorities (NATA)- Australia
•Ente Costarricense de Acreditación (ECA) - Costa Rica
•Superintendencia de Industria y Comercio (SIC) - Colombia