< Topic >Being one-touch in the tank, you install and you offer the thermometer for the aquatic organism tank which is made possible.SolutionsAs you pull out the hook component 6 which provides the brattice piece 7 of collar condition in the Tip of slide body 8 computer in the thermometer which joints with the temperature sensor which detects the water temperature inside 1 of the frame condition which has the temperature indicatory department and the tank electrically, from the rear of the computer and provide unrestrictedly, you pull out and the time the computer rear and you configurate the interval of the brattice one rear of the hook component more largely than thickness of the tank.< Choice figure >Drawing 3【課題】水槽にワンタッチで取り付け可能とした水棲生物水槽用温度計を提供する。【解決手段】温度表示部を備えた筐体状の本体1と、水槽内の水温を検出する温度センサとを電気的に接続した温度計において、スライド体8の先端に鍔状の張出片7を設けたフック部材6を本体の背面から引き出し自在に設けると共に、引き出し時の本体背面とフック部材の張出片背面との間隔を水槽の厚みより大きく設定する。【選択図】図3