noun
water temperature gauge; water temperature meter
A device that measures and displays water temperature, used in contexts such as aquariums, car engines, or industrial equipment.
車の水温計が上がっているので、エンジンを止めた。
I stopped the engine because the car's water temperature gauge was rising.
熱帯魚の水槽には水温
A water temperature gauge is necessary for a tropical fish tank.