Easy to read: With compact design, the Large LCD display unit is easy to read. Celsius/Fahrenheit: It records a wide range of temperature (can be read in Celsius or Fahrenheit), which makes it exceptionally useful in that you can use it in any kind of fish tank. Precise: Displaying temperature measurements within 0.1 degrees. And has a temperature range from -50 to +70 degrees celsius. Easy to set up: This thermometer comes with two parts that have suction cups that simplify the mounting process. Durable: its powered by one LR44 battery. These are very long lasting and easy to replace. Making this a great choice if youre looking for an accurate and durable thermometer. Item Name: Thermometer Material: Plastic Measuring Range: -58 Fahrenheit Degree to +158 Fahrenheit Degree (-50 Celsius Degree to +70 Celsius Degree) Working Temperature: -50 to 140 Fahrenheit Degree (-10 to 70 Celsius Degree) Working Humidity: 20%~85% (No Condensate) Maximum Precision: 0.1 Celsius Degree Margin of Error: +/-1 Celsius Degree Powered by: 1 x LR44 Button Battery (Included) Features: Mini Size, Digital Display, High Precision, Battery Powered Thermometer Size: 5.8cm x 3.7cm x 1.6cm/2.28" x 1.46" x 0.63" (Approx.) Cable Length: 1m/39.37" (Approx.) Installations: 1. Open the battery cover and insert the battery, please make sure (+) positivepole face upward. 2. Set up the suction cup. 3. Clean the surface of the suction cup with for the best adsorption. 4. Adhere it at the glass of tank. 5. Press and hold the power (PWR) button to turn on. Press the power button for 3 seconds to turn off. Notes: To get the best result, the probe should be submerged into the tank to gauge the water temperature. Please dont submerge the whole thermometer, only the probe. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 x 1 x Thermometer 1 x LR44 Button Battery 2 x Suction Cup Mounts 1 x Standard Color Package