Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) 120 Liter $241.30 Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) quantity Add to cart SKU: GFX120-155-1500-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 Propane (C₃H₈) Calibration Gas – 50% LEL (1.05% Vol) – 34L Cylinder $52.25 Add to cart Ammonia (NH₃) Calibration Gas $304.00 Select options This product has multiple variants. The options may be chosen on the product page Silane (SiH₄) Calibration Gas – 10 ppm – 60L Cylinder $304.00 Add to cart Phosphine (PH₃) Calibration Gas – 0.5 ppm – 60L Cylinder $304.00 Add to cart