With easy-to-read LCD digital display for this thermometer, you can easily keep an eye on the temperature in your aquarium. Features: Clear temperature readings with the easy-to-read LCD display. Automatic high/low temperature alarm function(ONLY KT506). Mini size, compact design and easy to use. Just tear down the film at the back, then attach it on the outside wall of tank. Great digital thermometer for fish tank and aquarium. Specifications: Model Type: KT505 / KT506(Optional) Material: ABS Display: LCD Digital Display Temperature Range: 0°C to 37°C Default Setting for Alarm: Highest: 28°C; Lowest: 18°C (ONLY KT506) Power Supply: 1 * 1.5V AG10 Button Battery(Not Included) Item Size: 51 * 36 * 10mm / 2 * 1.4 * 0.4in Item Weight: 18g / 0.64oz Package Size: 12 * 6.5 * 1.5cm / 4.72 * 2.56 * 0.6in Package Weight: 25g / 0.9oz Note: Please attach the thermometer onto the outside wall of tank(do not submerge thermometer in water), put metal part below the water surface. KT506 model has