High Precision Display: This aquarium thermometer uses a high precision temperature sensor that will accurately display the temperature of your aquarium HD LED Display: This aquarium thermometer uses a digital LED display ,you can see the temperature of the aquarium thermometer on it,the temperature value is clear and easy to read Small and easy to use: This digital aquarium thermometer uses double-sided adhesive transparent on the back, the package can be stuck on the aquarium for use Long battery life:The aquarium fish thermometer is equipped with a 3V battery, which has a long lifespan.Long lifespan, up to five years Easy to use and read 1. Clean and dry the outer glass of the aquarium. 2. Peel off the back of the thermometer. 3. Stick the strip against the exterior wall of the aquarium, making sure it is below the water level. 4. Just touch the display screen and the temperature will show. Practical Tips: Simply attach this thermometer to the outside of your aquarium, and ensure make sure it is not near a heat source such as a light bulb or heat pump. It takes about 15 minutes to get used to the temperature when it is stuck to the outside of the aquarium for the first time.