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425X Mixture

GASCO Precision Calibration Gas 425X Mixture 10 PPM Hydrogen Sulfide, 0.14% Pentane (10 % LEL), 18 % Oxygen, Balance Nitrogen, for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA

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