Starter set with 3 temperature transmitters WEATHERHUB OBSERVER | TFA Dostmann
TFA Weatherhub-System Pro 3+1 31.4005.02
WeatherHub - Apps on Google Play
TFA WeatherHub Starter-Set with wireless thermo and hygro meter
Weather Hub Observer Web Monitoring System with Thermo Hygrometer with Professional Temperature Sensor Cable Cat. No. 31.4013.02 : Amazon.de: Business, Industry & Science