Review on GZAIR Temperature Relative Mountable: Advanced 0-5000ppm Sensing for Precise Monitoring by Justin Zilinskas

I use this CO2 to monitor the CO2 levels in my house. I like the fact that this is a sensitive device that measures CO2 gas levels in real time. As expected, when I am near the monitor, the CO2 level increases as I exhale CO2 and thus increase the CO2 concentration around the monitor. When the outside conditions were pleasant, I opened the windows and found that the CO2 level had dropped significantly, as expected. It also tracks the current ambient temperature as well as relative humidity. Temperature readings as well as humidity readings match another monitor that measures both indoor and outdoor temperature and relative humidity. It has a backlight feature that can be activated by touching any function button on the screen, which is useful at night or in low light conditions. The numbers are easy to read and there is also a live graph of the monitored CO2 levels over the last few hours. It's USB powered so needs to be plugged into the USB charger that comes with cell phones, which I've had plenty of. initially indicated high CO2 levels. After the monitor has been running for a few minutes, it appears to go into self-calibration mode and eventually the displayed CO2 levels fall to the actual measured CO2 levels.