สมาคมมาตรวิทยาแห่งประเทศไทย

American Society for Testing and Materials (ASTM)

Bureau International des Poids et Mesures (BIPM)

National Physical Laboratory (NPL)

National Measurement Institute (NMI)

European Co-operation for Accreditation (EA)

National Institute of Standard and Technology (NIST)

National Metrology Institute of Japan (NMIJ)

Physikalisch-Technische Bundesanstalt (PTB)