Coriolis meters have gained worldwide acceptance in liquid applications since the early 1980’s with an installed base or more than 350,000 units. Newer designs have shown greatly improved low-flow sensitivity, lower pressure drop, and immunity to noise; factors which now enable their successful use in gas-phase fluid applications. With more than 20,000 units on gas around the world, groups including the AGA, API, Measurement Canada, German PTB, and Dutch NMi are all involved in writing standards for this “emerging” gas flow technology