MSA 10007049 Equivalent by GASCO 0.35% VOL. Pentane, 19% O2, 100 PPM CO, 25 PPM Hydrogen Sulfide, Balance Nitrogen contained in a 650 liter factory refillable cylinder, For Use with Any and All Gas Detectors, Cylinder Connection: TBD Gas Specific, Calibration Certificate NIST, Made in the USA