A0430697 Calgaz | equivalent by GASCO | 10PPM Hydrogen Sulfide, 50PPM Carbon Monoxide, 2.5%(50%LEL) Methane, 18% Oxygen, Balance Nitrogen, 34 liters, C-10 contained in a 34 Liter Disposable Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA