Not really sure - Incorrect values

In addition, I have asked for testing purposes 2 other stations to include a has built Venta which probably quite reliable sensors. Values ​​displayed after prolonged standing:

Netatmo
Indoor 23.5 degrees
67% speak.
Outdoor: 24.1 degrees
59% speak.

Venta: 23.8 degrees
50.9% speak.

Other additional station (TFA):
24.1 degrees
51%

The aviat. Values ​​are so far apart that I also wonder if the other displayed values ​​are correct, which I now can not check (dB, CO2). After a brief e-mail to the support I received a reply in English and the device should now send to France in the "Test Lab". This I have done at their own expense. The answers from the support often come only after 2-3 days. I believe that the review currently, am curious how it goes.

The air humidity measurement can not be calibrated by setting well. This is only possible at the temperature. So for 160 have since been ordinary sensors must be installed. The station of Venta cost 30 ...
The very fact that you have to recalibrate and can not simply rely on the station, bothers me immensely already. I do not know if I keep them eventually .. but lacks me to alternatives.

Update:
Another star deduction is available for the miserable support. I have criticized above values ​​and communicates in English with the support.
I sent the station to France. There just hygrometer was exchanged, as I found out, thanks to demand.
I have the same false values ​​still. The whole lasted 3 weeks. The support needed to respond to 2 days for each question.
Oh, the station had slight scratches when I get them back on the cover ..

The station is definitely back.