chanwaia How can I rename the 2nd one to ÖAG-EAF?
Use ZWO's ASIStudio.
A number of components of ASIStudio have access to the electronic focuser (I guess you have already discovered that there is nothing "automatic" about it -- it is just a dumb stepper motor that runs off a USB-HID microcontroller).
When you open the EAF in ASIStudio, there is an icon next to the name that allows you to edit the name field. It does not allow you to change the name, it only allows you to add a string that is then added in parenthesis after the string "EAF" . I have mine named EAF(fsq), EAF(foa), EAF(55FL), EAF(Lens), etc. You will need something more recent than EAF firmware version 3.3.1 or somewhere around there to be able to edit the name field.
I am not sure it allows umlauts.
Will it also detect both "Temperature & Humidity" at the same time?
No. And the temperature reading is an on-chip sensor which does not accurately reflect the temperature of your telescope tube, unless you add the external probe (that you can make yourself using an NTP 10kΩ thermistor, if memory serves, to avoid that long cable from ZWO). If you need dew point estimate, you will need something else than the ZWO EAF.
Chen