With large and easy-to-read LCD digital display for this thermometer, you can easily keep an eye on the temperature in your aquarium. Features: Great accurate temperature readings with the easy-to-read LCD display. Automatic high/low temperature alarm function(default setting: highest: 28C; lowest: 18C). 2 temperature units to switch: Celsius(C), Fahrenheit(F). With LED alarm indicator light. Compact design and easy to use, just attach the thermometer onto the tank wall. Suitable for fish tank or aquarium use. Specifications: Model Type: KT501 / KT502(Optional) Color: KT501: White; KT502: Black Material: ABS Display: LCD Digital Display Temperature Range: 0C to 37C / 32F to 98.6F *Power Supply: KT501: 1 * 1.5V AG13 Button Battery(Not Included) KT502: 1 * 1.5V AG10 Button Battery(Not Included) *Item Size: KT501: 76 * 60 * 13mm / 3 * 2.36 * 0.51in KT502: 60 * 46 * 12mm / 2.36 * 1.8 * 0.47in *Item Weight: KT501: 38g / 1.34oz KT502: 27g / 0.97oz *Package Size: KT501: 11 * 10 * 1.5cm / 4.33 * 3.94 * 0.6in KT502: 10 * 8.5 * 1.5cm / 3.94 * 3.35 * 0.6in *Package Weight: KT501: 51g / 1.79oz KT502: 36g / 1.28oz Note: Please attach the thermometer onto the outside wall of tank(do not submerge thermometer in water), put metal part below the water surface. For KT502 model, user can adjust the high/low temperature alarm settings with 3 buttons(ONLY KT502!!!). Package List: 1 * LCD Aquarium Thermometer