Patent ID: 7229210

Claim:
A self-standing aquarium thermometer for an aquarium having a glass wall, comprising: a self-standing housing having a bottom cavity and a front side defining a display window thereon; a weighting element disposed within said bottom cavity of said self-standing housing for providing a downward sinking force which is greater than a water floating force, wherein said self-standing housing is adapted for disposing in said aquarium to sink towards a bottom side thereof while said self-standing housing is positioned at an upright manner, wherein said self-standing housing further has an air chamber formed at a position above said bottom cavity for providing an upward floating force against said sinking force such that said self-standing housing is allowed for sinking towards said bottom side of said aquarium at an upright orientation; and a thermometer unit, comprising: a power supply sealedly received in said self-standing housing; a temperature sensor having a sensor probe outwardly protruded from said self-standing housing for monitoring a water temperature of said aquarium; and a temperature display which is electrically connected to said power supply and is sealedly received in said self-standing housing at a position aligned with said display window for displaying said water temperature of said aquarium, such that when said self-standing housing is retained at said upright orientation, said water temperature is shown at said display window and is adapted for being seen from an exterior of said aquarium through said glass wall.