GASCO 58L-421 | 100 PPM Carbon Monoxide 2.5% CH4 (50% LEL) Methane 25 PPM Hydrogen Sulfide 18% Oxygen in Nitrogen contained in a 58 Liter Aluminum Cylinder, Cylinder connection C-10 5/8″-18 UNF, Calibration Certificate NIST, Made in the USA
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