Calibration Gas Gas Name Propylene Air Gas Mixture 1 Percent Hydrogen (25 Percent LEL) Balance Air Background Gas Air Cylinder Capacity 105L Cylinder Material Aluminum For Use With Any and All OEM Gas Detectors Connection Size C-10 Max Pressure 1200 psi Cylinder Dia 3-13/64 In. Cylinder Height 12-1/2 In. Accuracy +/-2 Percent Calibration Certificate NIST