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Siterlink Carbon Monoxide Detector, 10-Year Life Carbon Monoxide Alarm, Replaceable Battery CO Detector with LCD Digital Display and Test Button, 3 LED Lights CO Alarm for Home, GS828C-D, 2 Pack - Amazon.com
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Industrial Scientific Calibration Gas: 100 ppm Carbon Monoxide, 25 ppm Hydrogen Sulfide; 10 ppm Sulfer Dioxide; 18% Oxygen; 25% LEL Pentane; 116L Cylinder - Conney Safety
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