This is an aquarium thermometer with two suction cups, one on the back of the thermometer and the other on the probe cable. You can attach a thermometer to the aquarium. Two temperature units (°C and °F) can be switched. Measurement probe: -50°C~+70°C / -58°F~158°F Dimensions: 58×37×16mm. An on/off button is provided. This aquarium thermometer is perfect for tropical marine aquariums, aquariums, reptiles, incubators, cars, refrigerators, brooders, cigars, etc. This reptile thermometer with probe is ideal for monitoring the living environment of reptiles such as lizards, turtles, snakes and more. LCD display digital thermometer with probe. Probe cable length: about 98cm. Note: Do not put the thermometer in water, only the probe is waterproof.