Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 74 L, Cylinder Diameter 4.25 in, Cylinder Height 14.25 in, For Use With All OEM Gas Detectors, Gas Mixture Hydrogen Sulfide 25 ppm, Methane 2.5 Percent, Gas Type Hydrogen Sulfide, Methane, Product Type Calibration Gas, Chemical Formula CH4, H2S, CAS Number 74-82-8, 7783-06-4, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Aluminum Alloy