Calibration Gas, CGA Number CGA 165, Container Type Cylinder, Cylinder Capacity 221 L, Cylinder Diameter 9 in, Cylinder Height 16.25 in, For Use With All OEM Gas Detectors, Gas Mixture Carbon Dioxide 25 Percent, Gas Type Carbon Dioxide, Product Type Calibration Gas, Chemical Formula CO2, CAS Number 124-38-9, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 3/4 in, Outlet Connection Type NGT, Standards ISO 9001:2015