$308.75 120 Liter Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Methane (CH4), Oxygen (O2) quantity Add to cart SKU: GFX120-150-100-I Category: Gas Cylinders Description Description Hydrogen Sulfide 20 ppm/ Carbon Monoxide 60 ppm/ Methane 1.45% (58% LEL Pentane Equiv.)/ Oxygen 15.0%/ N2 Related products Methane (CH4) $95.00 Add to cart Hydrogen Cyanide (HCN) $232.75 Add to cart Carbon Dioxide (CO2) $109.25 Add to cart Nitrogen (N2) $95.00 Add to cart