What do you mean by the International Organization of Legal Metrology (OIML) Certification System ?

The International Organization of Legal Metrology (OIML) is an intergovernmental treaty organization whose membership includes Member States, countries which participate actively in technical activities, and corresponding Members, countries which join the OIML as observers. It was established in 1955 in order to promote the global harmonization of legal metrology procedures. The OIML certificate system for measuring instruments was introduced in 1991 to facilitate administrative procedures and lower the costs associated with the international trade of measuring instruments subject to legal requirements. The System provides the possibility for a manufacturer to obtain an OIML Certificate and a Test Report indicating that a given instrument complies with the relevant requirements of OIML. Certificates are delivered by the OIML Member States that have established one or several Issuing Authorities responsible for processing applications by manufacturers wishing to have their instrument certified. Certificates are accepted by national metrology services on a voluntary basis and as the climate for mutual confidence and recognition of test results develops between OIML Members, the System serves to simplify the type (pattern) approval process for manufacturers and metrology authorities by eliminating costly duplication of application and test procedures.