Kidde 10-Year Worry Free Smoke & Carbon Monoxide Detector, Lithium Battery Powered with Photoelectric Sensor and Voice Alarm 21030866 - The Home Depot
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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SMART SENSOR AS8700A CO Gas Monitor 1~1000 ppm Carbon Monoxide Alarm Portable Carbon Monoxide Detector - AliExpress
PRO-LAB Carbon Monoxide Detector, Professional Laboratories in the Test Kits department at Lowes.com