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428-20CO2 Mixture

GASCO Calibration Gas 428-20CO2 Mixture 60 PPM Carbon Monoxide, 20 PPM Hydrogen Sulfide, 2.5% Carbon Dioxide, 1.45% Methane (29% LEL),  (58% LEL Pentane Equivalent), 15% Oxygen, Balance Nitrogen, For Use with Any and All Gas Detectors, Calibration Certificate NIST, Made in the USA