Small Size, light weight. No affect the living space of fish. Build-in Sensor: No wire required, exactly measuring temperature. LCD display, easy reading in celsius degree , -50°C ~ 70°C measuring range. Simple operation, pressing the bottom suction cup to the interior of the aquarium and attach it. Waterproof of submersible grade, allow the thermometer completely immersed inside the aquarium. Multi Fuction: Used in the aquariums and reptile feeding box, ideal equipment for monitoring the temperature.