Calgaz calibration gas 10PPM Hydrogen Sulfide (H2S), 300PPM Carbon Monoxide (CO), 1.45% Methane (CH4), 2.5% Carbon Dioxide (CO2), 15% Oxygen (O2) Balance Nitrogen 34 Liter Aluminum Cylinder, Inlet: C-10, Cylinder/Blend: 2AL 10PPM H2S/300PPM CO/1.45%CH4/2.5%CO2/15%O2/N2, Catalog: A0430665