Handheld Carbon Monoxide Meter,High Precision Carbon Monoxide Detector,Portable CO Gas Leak Detector,LCD Display CO Gas Tester Monitor - Amazon.com
First Alert 6-Pack Battery-Operated Carbon Monoxide Detector in the Carbon Monoxide Detectors department at Lowes.com
CO2 Leak Detector | CO2Meter.com
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
Slim Photoelectric Smoke Alarm with 10-Year Battery