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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
INDUSTRIAL SCIENTIFIC TANGO TX1, CO MONITOR - Single-Gas Detectors - IDSTX1-1 | TX1-1 - Grainger, Canada
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