Calibration Gas Gas Name Isobutylene Gas Mixture 100 ppm Isobutylene Balance Air Background Gas Air Cylinder Capacity 58 L Cylinder Material Aluminum For Use With GasAlert Micro 5PID VOC Detectors Connection Size C-10 Max Pressure 500 psi Cylinder Dia 3 1/2 in Cylinder Height 14 1/4 in Accuracy +/-5 Percent Calibration Certificate Yes