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311-18 100 PPM CO, 25% LEL Pentane, 18% O2, in N2

GASCO 311-18 :100 PPM Carbon Monoxide, 0.35 % Pentane (25 % LEL), 18 % Oxygen, Balance Nitrogen, for calibration and maintenance of gas detectors, NIST Calibration Certificate Included. GASCO Calibration Gas is ISO 9001 Certified, Made in the USA

Shelf Life 48 Months