Features: The thermometer activates by pressing the power button to accurately measure temperature, immediately displaying the reading. The thermometer switches between Celsius and Fahrenheit. When not in use, press the power button to turn off the device to conserve energy. If the thermometer loses power, replace the battery located on the back and continue using. Suitable for aquarium enthusiasts, breeders, and researchers concerned about water quality and health. Specifications: Dimensions: 5×5×1.4cm / 1.96×1.96×0.55in Material: ABS Package Includes: 1 x LCD Digital Thermometer Note: 1. Please allow 1-2cm errors due to manual measurement. 2. Due to differences in monitor displays, the actual color may vary. 3. This is an electronic thermometer and must not be submerged in water. The battery is replaceable.