Implementation of this report format is informative with regard to the implementation of OIML R 139-1 and -2 in national regulations. However, its implementation is mandatory within the framework of the OIML Certificate System for Measuring Instruments. Note concerning the references: All references are to the combined publication OIML R 139-1 and -2:2014. In this report format this publication is referred to as “R 139”. This report format applies for any kind of compressed gaseous fuel measuring system for vehicles (independent of its technology). It presents a standardized format for recording the results of the various tests and examinations, described in R 139-2:2014, to which a type of a compressed gaseous fuel measuring system for vehicles shall be submitted with a view to its approval based on this OIML Recommendation.