LONG BATTERY LIFE: The aquarium thermometer has a built-in battery for long battery life. DISPLAYABLE: The aquarium thermometer can be simply peeled off the adhesive and attached to the outside of the aquarium below the water level. The aquarium thermometer has a reading range of 0-60 degrees Celsius. CORDLESS AND TOUCHABLE DESIGN: The adhesive sensor thermometer senses the water temperature through the probe, with cordless design, there are no messy wires in the water, providing a clean and safe environment for your fish. Temperature is displayed at the touch of a button and the thermometer go to sleep after 5 seconds outside the aquarium. The digital thermometer is suitable for freshwater, tap water, salt water, seawater and other water qualities. LED DISPLAY: The aquarium thermometer uses an LED screen to display the temperature, the LED display has a wide viewing angle and high color saturation, making it easy to read the data day or night. APPLICATION: Suitable for fresh water, tap water, salt water, seawater and other water qualities. Colour:As Shown Material:plastic Precautions: Simply fix the thermometer to the outside of the aquarium and make sure it is not near heat sources such as light bulbs or heat pumps. The first time the thermometer is attached to the outside of the aquarium, it take about 15 minutes to get used to the temperature. Package Contents: 1 * Fish tank thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.