This smart pool thermometer comes with a cable probe. Optionally, the cable probe can be lowered into the skimmer or in the swimming pool or optionally installed in the filter system with a pipe mounting set. The battery-operated control unit with display can also measure air temperature and humidity. The measured values can be queried either via Bluetooth or via WIFI with the optionally available WIFI gateway. The optionally available WIFI gateway has a large LCD display and shows the temperature and humidity of the pool thermometer as well as the air temperature and humidity values from the installation location.