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365-305-50 Mix CO2 30%, CH4 50% by Volume in N2

GASCO 365-305-50 Calibration Gas Mixture, CO2 30%, Methane 50% by Volume, Balance Nitrogen, for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA