TRACEABLE, LCD, 0 to 20% CO2 Concentration, Data Logging Carbon Dioxide Meter - 53DU68|6526 - Grainger
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SMART SENSOR Handheld Carbon Monoxide Meter with High Precision CO Gas Tester Monitor Detector Gauge LCD Display Sound and Light Alarm 0-1000ppm - Walmart.com
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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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