Abstract: A fluid impermeable housing includes a lower support body receiving a battery, with an upper body portion mounting a printed circuit board containing a light-emitting diode panel for indication of temperature with the light-emitting diode panel operative through the printed circuit board and a temperature sensor directed through the housing to effect indication of ambient pool water temperature. The organization includes a threadedly securable lower and upper cap permitting access to the components of the organization for maintenance and replacement of various portions thereof. A modification of the invention includes cup support structure arranged on diametrically opposed sides of the support housing utilizing the temperature indication of the light-emitting diode panel for indication of ambient pool water temperature. The cup support structure includes a cup holder wherein drinking cups may be mounted.