116L-404-17 | Calibration Gas | Carbon Monoxide 100 PPM | Methane 50% LEL | Hydrogen Sulfide 25 PPM | 17% Oxygen | Nitrogen Balance | contained in a 116L Liter Disposable Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA