Calibration Gas Gas Name Chlorine Nitrogen Gas Mixture 5 PPM Chlorine Balance Nitrogen Background Gas Nitrogen Cylinder Capacity 44L Cylinder Material Aluminum Alloy For Use With Any and All OEM Gas Detectors Connection Size C-10 Max Pressure 825 psi Cylinder Dia 2-9/10 In. Cylinder Height 10-1/2 In. Accuracy +/-5 Percent Calibration Certificate NIST