OIML (International Organization of Legal Metrology) is a transnational organisation founded in 1955. OIML cooperates with Metre Convention and BIPM (International Bureau of Weights and Measures) for international harmonisation of legal metrology. 


OIML develops and publishes international standard-like recommendations, on the basis of which members can establish national legislation for various measuring instruments. Technical requirements in the draft of the European Measuring Instruments Directive (MID) are mostly identical to OIML recommendations. 


Main content of the OIML recommendations consists of the following:


  • scope of application, manner of application and terminology
  • metrological requirements
  • technical requirements
  • methods and controls to be used in testing and demonstrating compliance
  • test report format.


Technical Committees and Subcommittees that consist of OIML Member State representatives prepare the drafts for OIML recommendations and documents. Representatives appointed by both Member States (59 countries) and Corresponding Members (56 countries) may participate in the OIML Technical Committees, but only Member States have the right to vote. Certain international and regional organisations also participate in the work as consulting parties. OIML and different institutions (such as ISO and IEC) have concluded cooperation agreements with a view to preventing contrasting requirements. This means that manufacturers and users of measuring instruments and testing laboratories may use the publications of OIML and other institutions in parallel.


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