CO2 reading is waay off! Any ideas why?
TIA!
Jack
My reads next to 0 at ambient… 
Did you solved your problem? I tried to push both up and down button together for more then 5 sec, than you come to a hidden menue. Here you can adjust time in the first line and a value in the second line. Fabric-setting is 3 min. in toppline and the value 400 in secondline. I have set the value to 850 and let it do its work for the 3 minutes, and now it seems to work …
This worked for my sensor that was reading high levels of co2 wouldnt drop my tent below 1100 ppm now it reads comfortably less than 900. But what does this actually change in the sensor settings? Have you tested it against another sensor?