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499BS Mixture

GASCO Calibration Gas 499BS Mixture 0.50 % Carbon Monoxide, 130 PPM Hydrogen Sulfide, 1.25 % Methane (25 % LEL), 11.78 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA