Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 66 L, Cylinder Diameter 3.13 in, Cylinder Height 10.64 in, For Use With All OEM Gas Detectors, Gas Mixture Hydrogen Sulfide 25 ppm, Methane (50 Percent LEL) 2.5 Percent, Oxygen 19 Percent, Gas Type Hydrogen Sulfide, Methane, Oxygen, Product Type Calibration Gas, Chemical Formula CH4, H2S, O2, CAS Number 74-82-8, 7782-44-7, 7783-06-4, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST