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409 Mixture

GASCO 409 Calibration Gas Mixture: 50 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 2.5 % Methane (50 % LEL), 12 % Oxygen, Balance Nitrogen, Ships with NIST COA certificate of Analysis certification, Made in the USA

Blend Tolerance +/-5% and Analytical Tolerance is +/-2%