Markus Robert Kessler wrote:
> Most significant "outlayer" is produced by Adafruit BME280, which claims
> that the humidity value is around 10 percent points higher than most
> other sensors (i.e., 40% China noname and 50% Adafruit).

Yes. humidity mearuement is guesswork and approximate at best, whatever
consumer grade stuff you use.

> Any experiences with that stuff, or knowing ways to test / verify /
> calibrate those modules?

There are some manuals describing closed containers and salt solutions
at given concentrations. Are you sure, it's worth it?

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