Calibration Gas Gas Name Propane Oxygen Nitrogen Gas Mixture 2000 PPM Propane (10 Percent LEL) Balance Air Background Gas Air 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