Product details:

The Intermatic PA122 is a water temperature sensor. It is designed for use with PE650 transceivers. Depending on the position of the diverter valves, the sensor monitors both spa and pool water temperature. For the thermostatic control to work, installation is necessary. After the sensor is plugged into the panel-mounted transceiver PE650, the water temperature will be displayed on the Intermatic PE953 hand-held transceiver.