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421SO2B Mixture

GASCO Precision Calibration Gas 421SO2B Mixture 50% LEL Methane, 17% Oxygen, 100 ppm Carbon Monoxide, 10 ppm Sulfur Dioxide, Balance Nitrogen for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA