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 Carbon Monoxide 200 ppm, Methane (50 Percent LEL) 2.5 Percent, Oxygen 18 Percent, Gas Type Carbon Monoxide, Methane, Oxygen, Product Type Calibration Gas, Chemical Formula CH4, CO, O2, CAS Number 630-08-0, 74-82-8, 7782-44-7, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST