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414-35 Mixture

GASCO Calibration Gas 414-35 Mixture 300 PPM Carbon Monoxide, 35 PPM Hydrogen Sulfide, 1.25% Methane,  (25% LEL),  (50% LEL Pentane Equivalent), 15% Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA