Calibration Gas, CGA Number CGA 600, Container Type Cylinder, Cylinder Capacity 17 L, Cylinder Diameter 2.9 in, Cylinder Height 10.75 in, For Use With All OEM Gas Detectors, Gas Mixture Carbon Dioxide 35 Percent, Methane 2.5 Percent, Gas Type Carbon Dioxide, Methane, Product Type Calibration Gas, Chemical Formula CH4, CO2, CAS Number 124-38-9, 74-82-8, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 3/4 in