Product review (5 stars): Excellent Gizmo
This meter changed my world! The moment I powered the meter a High CO2 level alarm sounded. My CO2 was around 2800 ppm. I was a bit surprised at first but then realized that the small office gets filled quite fast with breath exhaust carbon dioxide. In my bedroom (closed environment) for example I have around 350-500ppm (fresh air) and after 10 hours of sleep it was 2000ppm (over 2k ppm is considered unhealthy). I found on the internet that the FDA suggests keeping the C02 levels to be kept below 1000 ppm and they explain that levels over 2000 ppm is unhealthy as it reduces energy and sometimes causes slight headaches. I've inspected all rooms for air pollution and found out that the meter responds quite fast to new environments and can give you stable reading within less than a minute. It seems that good fresh air circulation is needed to keep the CO2 levels normal.
I highly recommend this product!