Finally, an easy way to read your water temperature from both indoors and outdoors. * The WS-17 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-17 includes an indoor thermo-hygrometer in the console and can remotely read and update up to eight remote sensors at the same from the large digit, uncluttered jumbo display.