Features: This thermo-meter sticker is designed for measuring aquarium temperature,convenient to measure by stick on the outer surface of fish for tank. According to your aquarium temperature,it will show the temperature through colorful temperature scale while other temperature scale will still stay black. Easy to use and clear to read. Excellent for fish for tank owners,and will be good for fish living if it is a suitable temperature. Temperature range: 18 to 36 celsius degree. Specifications: Material: Plastic Type: Discoloration/Round Color: As pictures shown Temperature Range: 18 to 36 Degree Celsius Size: One Size Diameter: 5cm(1.97in) Quantity: 1 Pc(other accessories demo in the picture are not included!) Package Includes: 1 x Thermo-meter note: 1.Please allow 1-3cm 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!