Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 58 L, Cylinder Diameter 3.53 in, Cylinder Height 14.25 in, For Use With All OEM Gas Detectors, Gas Mixture Hydrogen Sulfide 10 ppm, Methane (50 Percent LEL) 2.5 Percent, Gas Type Hydrogen Sulfide, Methane Oxygen, Nitrogen, Product Type Calibration Gas, Chemical Formula CH4, H2S, N2, O2, CAS Number 74-82-8, 7727-37-9, 7782-44-7, 7783-06-4, Accuracy +/-5 Percent, Background Gas Air, Calibration Certificate NIST