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413X Mixture

GASCO Precision Calibration Gas 413X Mixture 50 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 1.05 % Propane (50 % LEL), Balance Air, for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA