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487TBS-M Mixture

GASCO Calibration Gas 487TBS-M Mixture 50 PPM Hydrogen Sulfide, 0.9 % Butane (50 % LEL), 18 % Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Cylinder connection Built in Aerosal Trigger, Calibration Certificate NIST, Made in the USA

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