Calibration Gas Gas Name Carbon Dioxide Methane Nitrogen Gas Mixture 15 Percent Carbon Dioxide 15 Percent Methane Balance Nitrogen Background Gas Nitrogen Cylinder Capacity 103L Cylinder Material Steel For Use With Any and All OEM Gas Detectors Connection Size C-10 (5/8 in UNF) Max Pressure 1000 psi Cylinder Dia 3-21/64 In. Cylinder Height 13-2/3 In. Accuracy +/-5 Percent Calibration Certificate NIST