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303E Mix 50 ppm CO, 1.62% CH4, 18% O2 in N2

GASCO 303E Calibration Gas Mix, 50 PPM Carbon Monoxide, 1.62 % Methane, (32 % LEL),(50 % LEL Propane Equivalent), 18% Oxygen, Balance Nitrogen, Certification: NIST, Made in the USA.