Dieses hier wäre das gesuchte: TFA WeatherHub SET7 :)

Hi, the thermometer works well and as described. I don't remember the certificates, I disposed of the packaging. Have a look at the manufacturer's website. Good for room climate monitoring. greetings

Yes, additional temperature sensors of up to 50 pieces (available at Galaxus) are possible on the app. I have already added 2 additional sensors to the app... Works perfectly.