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414B Mixture

GASCO Calibration Gas 414B Mixture 300 PPM Carbon Monoxide, 35 PPM Hydrogen Sulfide, 1.3% Methane,  (26% LEL),  (52% LEL Pentane Equivalent), 15% Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA

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