The measurement of natural gas and those associated with the measurement of natural gas are in a unique situation. Many companies are practicing gas measurement using AGA 1985, AGA 1992 (Revision) or a latest standard. The AGA 1992 (Revision) was slow to be accepted as the latest standard. Many companies could not make the separation between equipment in the field and the calculation as presented by the AGA 1992 (Revision). Consequently many companies did nothing for a considerable amount of time to make the changes from 1985 to 1992. The use of more flow computers and transmitters has encouraged the use of AGA 1992, in recent years