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491 Mixture

GASCO Precision Calibration Gas 491 Mixture 50 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 0.7 % Pentane (50 % LEL), 18 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA

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