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403S Mixture

GASCO Calibration Gas 403S Mixture 50 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 1.62 % Methane, (32.4 % LEL), (50 % LEL Propane Equivalent), 19 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA

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