Ambient Weather WS-25 Wireless 8 Channel Floating Pool and Spa Thermometer with Indoor Temperature and Humidity Finally, an easy way to read your water temperature from both indoors and outdoors The WS-25 wireless pool and spa thermometer is water proof and floats on the surface of the water. The sensor displays and wirelessly transmits the water temperature to the display console The console also includes an indoor thermometer and Hygrometer for Monitoring your environment The 8-channel Selectable switch allows you to monitor temperatures from up to eight different locations The screw-on lid design with internal gasket provides a Leak free, water resistant design