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This doesn't look good. I mean, a reduction in atmospheric CO2 might be nice (perhaps not this much of a reduction), but my device displaying 255 ppm CO2 immediately after calibration probably just means that it's faulty.

After I took it indoors the display rise above 300 for a few minutes and then it started displaying error 0x8002.

Anyone out there seen this fault before?
#Aranet4 #aranet #co2sensor #co2