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304TS-15 300 PPM CO, 50% LEL Ch4, 15% O2, in N2

GASCO 304TS-15 Calibration Gas 300 PPM Carbon Monoxide, 2.5 % Methane (50 % LEL), 15 % Oxygen, balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA