Combustible gas models start around $25, while those that include carbon monoxide detection start around $35. Kidde Nighthawk Plug-In CO and Gas Alarm. If you’re looking for a plug-in gas leak detector that’s on-duty day and night, consider the First Alert Explosive Gas and Carbon Monoxide Detector. Carbon Monoxide Detector Reviews. The KN-COEG-3 includes 9-Volt battery back up that provides protection during a power outage, when AC-only units can not provide protection. Our most popular products based on sales. Protect yourself from both carbon monoxide and explosive gas buildup while you sleep with this inexpensive detector. 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An 85-decibel alarm alerts you to a problem while the display screen will let you know just how high the CO concentration is. The detector … Whether you’re looking for a hardwired or battery-powered CO detector, we … It is one of the best carbon monoxide and gas detectors available in the market. Digital display – Displays the level of carbon monoxide the unit is sensing. Atwood 12 Volt CO and Propane Gas Detector This is a sleek modern design gas leak detector that keeps homes safe. Whether you are a service engineer or a homeowner looking to protect your family from explosive and dangerous emissions, one of these gas detectors will sound the alarm to help keep any premises safe. You can easily silent that alarm in case of false alarms. Protects you and your family from two deadly threats: Carbon monoxide and explosive gas. 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