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301B 50 PPM CO, 5000 PPM CO2, 50%LEL CH4, in Air

GASCO 301B Precision Calibration Gas 50 PPM Carbon Monoxide, 5000 PPM Carbon Dioxide, 2.5% Methane (50% LEL), Balance Air, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA


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