Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 103 L, Cylinder Diameter 3.3 in, Cylinder Height 13.6 in, For Use With All OEM Gas Detectors, Gas Mixture Carbon Monoxide 1,000 ppm, Oxygen 8 Percent, Gas Type Carbon Monoxide, Oxygen, Product Type Calibration Gas, Chemical Formula CO, O2, CAS Number 630-08-0, 7782-44-7, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 5/8 In.-18