Industrial Scientific 1810-9157 Equivalent by GASCO Calibration Gas, 100 PPM Carbon Monoxide, 25 PPM Hydrogen Sulfide, 0.35 % Pentane (25 % LEL), 18 % Oxygen, Balance Nitrogen contained in a 116 Liter Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA
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