Calibration Gas Gas Name Carbon Monoxide Hydrogen Sulfide Methane Oxygen Nitrogen Gas Mixture 200 ppm Carbon Monoxide 100 ppm Hydrogen Sulfide 2.5 Percent Methane (50 Percent LEL) 10 Percent Oxygen Balance Nitrogen Background Gas Nitrogen Cylinder Capacity 34L Cylinder Material Aluminum For Use With Any and All OEM Gas Detectors Connection Size C-10 Max Pressure 650 psi Cylinder Dia 2-29/32 In. Cylinder Height 10 In. Accuracy +/-5 Percent Calibration Certificate NIST