These requirements cover indicating pressure gauges of the elastic element type usually employed in the high-pressure side of regulators or reducing valves used on compressed gas containers or cylinders of oxygen@ hydrogen@ nitrogen@ and other gases. Such gauges usually have pressure ranges of 0 ?C 1500@ 0 ?C 2000@ 0 ?C 3000@ 0 ?C 4000@ 0 ?C 5000@ or 0 ?C 6000 pounds per square inch (psi) (0 ?C 10.34@ 0 ?C 13.78@ 0 ?C 20.68@ 0 ?C 27.56@ 0 ?C 34.47@ or 0 ?C 41.36 MPa).