Top combustible gas detector for the money. Pangaea Digital Gas Detector. What you need to know: It’s great for basic at-home detection but not for professional-grade use. What you’ll love: It ...

Best Overall: Kidde Carbon Monoxide Detector AC-Powered with Battery Backup; Best Value: ... Power Source: Plug-in: Sensor Type: Electrochemical: Dimensions (L x W x H) 2.8 x 1.5 x 4.5 in. 2.

The Best Water-Leak Detectors . Best Overall: ... Power Source: AC adaptor, two AAA batteries ... The battery-operated remote sensors pair up with a plug-in hub that’s connected to your router.

Top smoke detector for the money. X-Sense Battery Operated Smoke and Carbon Monoxide Detector. What you need to know: The 10-year lithium battery means you won’t need to change it every year ...