Calibration Gas Gas Name R22 Air Gas Mixture 100 PPM Refrigerant R22 Balance Air Background Gas Air Cylinder Capacity 221L Cylinder Material Steel For Use With Any and All OEM Gas Detectors Connection Size CGA 165 Max Pressure 250 psi Cylinder Dia 9 In. Cylinder Height 16-1/2 In. Accuracy +/-5 Percent Calibration Certificate NIST