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International Organizations
- BIPM ：Bureau International des Poids et Mesures
- APMP ：Asia Pacific Metrology Programm
Asia Pacific 　
- NMIJ：National Metrology Institute of Japan 　　
- CTL：Chunghwa Telecom Laboratories (Taiwan)
- NMC/A*STAR：National Metrology Centre/Agency for Science, Technology and Research (Sigapore)
- NTSC：National Time Service Center (Republic of China)
- KRISS：Korea Research Institute of Standards and Science (Korea)
- NIM：National Institute of Metrology (Republic of China)
- NIMT：National Institute of Metrology (Thailand)
- NPLI：National Physical Laboratory (India)
- NML-SIRIM：Standards and Industrial Research Institute of Malaysia Berhad
- VMI-STAMEQ：Vietnam Metrology Institute, Directorate for Standards and Quality
- MSL：Measurement Standards Laboratory of New Zealand
- NMIA：National Measurement Institute of Australia
Europe
- PTB ：Physikalisch-Technische BundesanstaltSTAMEQ (Germany)
- OP：Observatoire de Paris (France)
- NPL：National Physical Laboratory (England)
North America
- USNO：The U.S. Naval Observatory (U.S.A.)
- NIST：National Institute of Standards and Technology (U.S.A.)