Review on X-Sense SC08 10-Year Battery Smoke and Carbon Monoxide Detector with LCD Display, Dual Sensor Smoke and CO Alarm, UL 217 & UL 2034 Compliant, Auto-Check Technology by Quintin Gore

When the Carbon Monoxide (CO) level is below 29ppm, this monitor will falsely tell you that the CO level is *Zero*. This is by design - it won't show a number above zero until the CO level exceeds 30ppm, which is pretty late. I bought this product because I wanted to monitor CO levels in real time. For example, when using a fireplace, I wanted to know if carbon monoxide was leaking into the room from the start. If you're trying to monitor real-time CO, this isn't the product for you (I'm now using the Sensorcon monitor instead). If you don't want to control CO, there's no reason to pay extra for an LCD screen.