I was concerned about CO2 levels in my basement office. Levels turn out to be okay, but there are some fluctuations. 400ppm with the windows open indoors, about 950ppm max with the windows closed and I'm running. In the darkness I noticed that from time to time the inner light shines. I don't know how to determine CO2 or relative humidity. It does not bother me. A very useful, unobtrusive device.
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