The OIML (International Organization of Legal Metrology) is an Inter-Governmental Treaty Organization which was established in 1955 for the purposes of facilitating both the international trade of measuring instruments through the harmonization of national regulations related to measuring instruments, and also the mutual recognition of measurement results.
The OIML has Observer Status within the WTO/TBT committee, where it is recognized as a key standard-setting organization. Currently the OIML comprises 60 Member States and 51 Corresponding Members, and Japan signed the Treaty in 1961.
The AIST International Metrology Cooperation Office serves as Japanese contact secretariat of OIML activities and makes efforts to reflect an agreed opinion of the Japanese legal metrology circle in OIML International Recommendations and Documents related to measuring instruments.[ Link to OIML ]