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428-20SO2-10 Mixture

GASCO 428-20SO2-10 Calibration Gas Mixture: 60 PPM Carbon Monoxide, 20 PPM Hydrogen Sulfide, 10 PPM Sulfur Dioxide, 1.45% Methane (29% LEL),(58% LEL Pentane Equivalent), 15% Oxygen, Balance Nitrogen, Certification NIST, Made in USA