Features: Simple to use and convenient to read. Measure the temperature of your fish for tank, your DIY Brew Beer and wine barrel, Terrarium, Green-house, Vivarium and any sort of pet for tank, or any place in your house. The right water temperature is very important for the for health of your fish, get your beer and wine right or use in kitchen or around the home to monitor temperature. Easy to install, just peel off the back of the sticker and the transparent protective film at the front and stick it on the outside wall of the aquarium, that is it. No battery and suction cup to worry about. The thermometers change color according to the surrounding temperature. If the surrounding temperature is 27C, then the background of scale mark 27C will turn colorful and other scale marks remain black. Specifications: Material: PET Dimension: 13 for cm/5.12" of length, 1.8 for cm/0.71" of width. Measurement range: Celsius degree18-34C, Fahrenheit degree 64-93F. Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: Quantity:1Pc