Calibration Gas Gas Name Propane Air Gas Mixture 0.33 Percent Propane (15.71 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