Calibration Gas Reactive Multi Gas - 50 PPM CO, 50% LEL PROPANE, 25 PPM H2S, 18.0% O2, BALANCE N2 34 Liter Aluminum Cylinder 58 Liter Aluminum Cylinder 116 Liter Steel Cylinder 50 PPM CO, 50% LEL PROPANE, 25 PPM H2S, 18.0% O2, BALANCE N2Cylinder SizeSelectSave to Wishlist