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400-20 Mixture

GASCO Precision Calibration Gas 400-20 Mixture 250 PPM Carbon Monoxide, 20 PPM Hydrogen Sulfide, 2.5% Methane (50% LEL), 18% Oxygen, Balance Nitrogen, Certification NIST, Made in the USA, Blend tolerance +/- 5%

GASCO Calibration Gas is ISO 9001 Certified.

 





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