Calibration Gas Gas Name Carbon Monoxide Gas Mixture 100 ppm Carbon Monoxide Balance Nitrogen Background Gas Nitrogen Cylinder Capacity 34 L Cylinder Material Steel For Use With GasAlert Series Models That Include Carbon Monoxide Sensors Connection Size CGA-600 Max Pressure 500 psi Cylinder Dia 3 1/8 in Cylinder Height 10 41/64 in Accuracy +/-5 Percent Calibration Certificate Yes