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Cheffort Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Gas Tester with LCD Backlit Display, 0-1000PPM Range for Industrial and Home (Battery Not Included) - Amazon.com
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Shield USB 6.0 Portable CO Detector – With iOS App – White – CostAero.com | Avionics and Pilot Supplies
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