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428-20MBS Mixture

GASCO 428-20MBS Precision Calibration Gas Mixture 60 PPM Carbon Monoxide, 20 PPM Hydrogen Sulfide, 0.375 % Pentane (25 % LEL), 15 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA

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