Description 4-Gas Cylinder for RKI, H2S 25 ppm / CO 50 ppm / CH4 50% LEL / O2 12% in N2, 58L, 81-0154RK-02 Description Specifications This 4-Gas Cylinder can calibrate RKI products. Gases include Hydrogen Sulfide 25 ppm, Methane 2.5% vol (50% LEL), Carbon Monoxide 50 ppm, and Oxygen 12% vol with Nitrogen balance. TypeRKI Mix Gas NameHydrogen Sulfide, Carbon Monoxide, Methane, Oxygen, Nitrogen Gas MixtureHydrogen Sulfide 25 ppm, Methane 2.5% vol (50% LEL), Carbon Monoxide 50 ppm, Oxygen 12% vol Background GasNitrogen Cylinder Capacity58 L Accuracy /-5% Max. Pressure1000 psi