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Sensorcon Inspector CO Carbon Monoxide Monitor with Visual and Audible Alerts, Waterproof - Amazon.com
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Google Nest Protect Smart Smoke and Carbon Monoxide Detector Alarm (Battery) in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com
System Sensor COSMO-2W 2-wire Smoke CO Detector Combo
Kidde Firex Smoke and Carbon Monoxide Detector, Hardwired with Battery Backup and Voice Alarm, Adapters Included, 2-Pack 21029889 - The Home Depot
X-Sense Wi-Fi Listener for Smoke & Carbon Monoxide Detectors, SBS50 Base Station Accessory (Not Included), Not for Monitoring Smoke or CO, Model SAL51 - Amazon.com
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First Alert Hardwired Talking Photoelectric Smoke and Carbon Monoxide (CO) Detector, 2-Pack | Costco
First Alert Battery Smoke and Carbon Monoxide Detector - Ace Hardware
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
Pro Lab Instant Results Carbon Monoxide Test Kit - Parker's Building Supply
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System Sensor COSMO-4W 4 wire Smoke CO Detector Combo