MSA 10058022 Equivalent by GASCO, 1.45% Methane, 300 PPM CO, 15% O2, 10 PPM H2S, 2.5% CO2, 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