Calibration Gas Gas Name Carbon Dioxide Carbon Monoxide Hydrogen Sulfide Methane Oxygen Gas Mixture 2.5 Percent CH4/18 Percent O2/25 ppm H2S/100 ppm CO/Balance N2 Background Gas Nitrogen Cylinder Capacity 34 L Cylinder Material Aluminum For Use With GasAlert Series Multigas Monitors Connection Size C-10 Max Pressure 500 psi Cylinder Dia 3 1/8 in Cylinder Height 10 41/64 in Accuracy +/-5 Percent Calibration Certificate Yes