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 Monoxide 25 ppm, Gas Type Carbon Monoxide, Product Type Calibration Gas, Chemical Formula CO, CAS Number 630-08-0, Accuracy +/-5 Percent, Background Gas Air, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 3/4 in, Outlet Connection Type NGT, Standards ISO 9001:2015