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409-ISO Mixture

GASCO Calibration Gas Mixture 409-ISO, 50 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 100 PPM Isobutylene, 2.5 % Methane (50 % LEL), 12 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA

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