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Lunarlipes Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Sensor Tester with LCD Backlit Display, 0-1000PPM Range for Industrial & Home (Battery Not Included) - Amazon.com
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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup | First Alert
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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CO Check Carbon Monoxide Alarm Test Gas (co8) Aerosol Can, uL | InspectUSA.com