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GASCO 34L-403E
(BIOSYSTEMS 54-9044E) Gasco Calibration Gas Cylinder with Carbon Monoxide (CO) 50 ppm, Methane (CH4) (1.62% vol or 50% LEL Pentane simulant), Hydrogen Sulfide (H2S) 25 ppm and Oxygen (O2) 18%. Balance Nitrogen. Available Sizes 34, 44, 58, 66 and 116 Liters.