OIML R 137 is the new approval standard for gas meters. In 2014, the test report format as well as the Certificate of Conformity system for the R 137 have been completed. The document covers diaphragm gas meters, turbine gas meters, ultrasonic gas meters and any other type of gas meter. Manufacturers whose gas meters are tested according to OIML R 137 , underpinned by a Certificate of Conformity, will be able to gain fast market access in countries outside Europe, such as Australia, Canada, the USA, China and Russia.