GASCO | 17L-36-5S-20.6 | X03NI74CP1709A6 | Calibration Gas 5 % Carbon Dioxide, 20.6 % Oxygen balance Nitrogen contained in a 17 Liter Disposable Steel Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection CGA 600, Calibration Certificate NIST, Made in the USA