Keep your pool or spa operating at the proper temperature with this water, air, solar sensor. As a WATER sensor install into the pipe between the filter pump and filter to keep the water temp where desired. As an AIR sensor install in the open air to notify your automation system of ambient air temperature. As a SOLAR sensor install next to the solar panels for unglazed panels, for glazed panels suspend sensor between the collector and the glazing. This replaces TS5T, STS5T Not replacement for Compool TS5L sensor