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320BS-35 Mix 35 PPM CO, 1000 PPM, in Air

GASCO 320BS-35 Specialty Calibration Gas Mixture 35 PPM Carbon Monoxide, 1000 PPM Carbon Dioxide, Balance Air, for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA