$308.75 120 Liter Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) quantity Add to cart SKU: GFX120-155-5300-I Category: Gas Cylinders Description Description H2S 25 ppm/ CO 100 ppm/ CH4 2.5% (50% LEL)/ O2 18.0%/ N2 Related products Carbon Dioxide (CO₂) Calibration Gas – 5000 ppm – 103L Cylinder $109.25 Add to cart Oxygen (O₂) Calibration Gas – 20.9% – 103L Cylinder $95.00 Add to cart Propane (C₃H₈) Calibration Gas – 50% LEL (1.1% Vol) – 34L Cylinder $52.25 Add to cart Propane (C₃H₈) Calibration Gas – 50% LEL (1.05% Vol) – 34L Cylinder $52.25 Add to cart