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355BS-15 300 PPM CO, 50%LEL CH4, 15% O2, in N2

GASCO 355BS-15 Precision Calibration Gas 300 PPM Carbon Monoxide, 2.5% Methane (50% LEL), 15% Oxygen, Balance Nitrogen, Calibration Certificate NIST, Made in the USA


GASCO Calibration Gas is ISO 9001 Certified.