How often should carbon monoxide alarms be tested & replaced? Much like knowing how often you should test your smoke detector ...

Portable carbon monoxide monitors can alert you to gas leaks in hotels and resorts as several tourists have died recently ...

The best smoke detectors quickly and reliably ... Its screen displays the real-time amount of carbon monoxide in the air, the status of the unit during a test, and a battery level icon.

In addition, the Nest Protect has sensors for carbon monoxide ... Nest Protect (as with all smoke detectors) by spraying an aerosol smoke-detector-tester spray from 5, 10 and 15 feet away ...