QICA (Quality Infrastructure Council for the Americas)

APMP (Asia Pacific Metrology Programme)

COOMET (Euro-Asian Cooperation of National Metrological Institutions)

SADCMET (Southern African Development Community Cooperation in Measurement Traceability)

EURAMET (European Collaboration in Measurement Standards)

AFRIMETS (Intra-Africa Metrology System)

GULFMET (Gulf Association for Metrology)

BIPM (Bureau International des Poids et Mesures)

OIML (International Organization of Legal Metrology)

PTB (Physikalish-Technische Bundesanstalt)

IAAC (Inter American Accreditation Cooperation)

COPANT (Pan American Standards Commission)

NSCLi (National Conference of Standards Laboratories International)