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: KT502(Optional)Color: KT502: BlackMaterial: ABSDisplay: LCD Digital DisplayTemperature Range: 0C to 37C / 32F to 98.6F*Power Supply: KT502: 1 * 1.5V AG10 Button Battery(Not Included)*Item Size: KT502: 60 * 46 * 12mm / 2.36 * 1.8 * 0.47in*Item Weight: KT502: 27g / 0.97oz*Package Size: KT502: 10 * 8.5 * 1.5cm / 3.94 * 3.35 * 0.6in*Package Weight: KT502: 36g / 1.28ozNote: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!!!).