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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!