Feature: 1. Using this thermometer and hygrometer, you can effectively monitor the temperature and humidity of the water tank. 2. It can automatically sense the outside and automatically sense the contact temperature, which is convenient and quick. 3. Equipped with an easy to read LED display, you can easily read the temperature of the aquarium. 4. The thermometer is small in size, light in weight, easy to carry, and has a small footprint, making it more convenient for you to use. 5. The preferred material is safe to use. You can use it to measure the temperature of various fish tanks and aquariums. Specification: Item Type: Wireless Thermometer Material: Plastic Product Size: Approx.5x3x1.5cm/2x1.2x0.6in Battery Model: 2 x LR44 Button Batteries (Shipped with Built-in Battery) Voltage: 3V Battery Capacity: 160mAh Temperature Range: -50-100°c Temperature Resolution: 0.1℃ Package List: 1 x Wireless Thermometer