116l-409 | X05NI85CP161FJ0 | Calibration Gas Carbon Monoxide 50 PPM, Methane 50% LEL, Hydrogen Sulfide 25 PPM, Oxygen 12%, Balance Nitrogen in a 116 Liter Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA