Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) 34 Liter $118.75 Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) quantity Add to cart SKU: GFX34-155-1500-I Category: Gas Cylinders Description Description Hydrogen Sulfide 25 ppm/ Carbon Monoxide 50 ppm/ Methane 2.5% (50% LEL)/ Oxygen 12.0%/ N2 Related products Carbon Dioxide (CO₂) Calibration Gas – 2.5% Vol – 103L Cylinder $109.25 Add to cart Methane (CH₄) Calibration Gas – 50% LEL – 103L Cylinder $95.00 Add to cart Hydrogen Cyanide (HCN) Calibration Gas – 10 ppm – 60L Cylinder $232.75 Add to cart Propane (C₃H₈) Calibration Gas – 50% LEL (1.1% Vol) – 34L Cylinder $52.25 Add to cart