Digital thermo-hygrometer with a large display. Measures outdoor temperature and humidity. Large display for easy reading from indoors. Maximum/minimum values with automatic reset. Easy to attach and removable for window cleaning. Weatherproof. It couldn't be easier to stay informed about the weather outside. When the VISION thermo-hygrometer from TFA is in use, the outdoor temperature and humidity are displayed in large digital numbers right on the window pane. Slim, lightweight, and elegant, it hangs outside the window, allowing you to conveniently read the measurements from inside. The maximum and minimum temperatures of the day are always included, updated daily with automatic reset. The weatherproof thermo-hygrometer is very easy to install: simply stick the holder on the outside of the glass, hang the device, and you're done. It can also be easily removed for window cleaning or battery replacement. TFA Dostmann. With over 1000 weather and measuring instruments, the German company TFA Dostmann is one of the leading companies in the industry in Europe. The TFA range is characterized by its own innovative technologies and exclusive designs, continuously developed in collaboration with meteorologists, IT specialists, and designers.