Calibration Gas Gas Name Acetylene Carbon Dioxide Carbon Monoxide Ethane Ethylene Hydrogen Methane Nitrogen Oxygen Gas Mixture 100 PPM Carbon Monoxide/100 PPM Acetylene/100 PPM Ethane/100 PPM Ethylene/100 PPM Hydrogen/100 PPM Methane/405 PPM Carbon Dioxide/2500 PPM Oxygen/17000 PPM Nitrogen Background Gas Nitrogen Cylinder Capacity 103 L Cylinder Material Steel For Use With Any and All OEM Gas Detectors Connection Size C-10 (5/8 in UNF) Max Pressure 1 000 psi