Hi Wolferl

I looked at some of the recent A3 indiegogo units and found some CO2 sensors that looked like they were behaving.
These units looked like they were mounted indoors ( from the temperature swings )
The units mounted outdoors (again from looking at the temperature swings ) had random excursions of the CO2 like mine.
There should be some daily movement outdoors, but it is usually periodic, or related to a weather event.
The movement on my CO2 sensor like others outside appears to be random.
I was wondering if the CO2 sensor in ABC calibration mode was not suited for outdoor installation as indicated by the spec sheet.

David