Ambient Weather WS-19 Wireless 8-Channel Floating Pool and Spa Thermometer with Two Remote Sensors Finally, an easy way to read your water temperature from both indoors and outdoors. The WS-19 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 8-channel selectable switch allows you to monitor water temperature from up to eight different locations. The screw-on lid design with internal gasket provides a leak free, water resistant design. Simple to read, simple to use, and affordable, the WS-19 includes an indoor thermometer in the console and can remotely read and update up to eight remote sensors at the same from the large digit, uncluttered jumbo display.