Feature:

This thermometer strip for easy monitoring, great for use in your fish tank or aquarium, it seems to be precise and sticks well to the aquarium. Allows you see the water temperature in either the Fahrenheit or Celsius temperature scale.

Temperature is accurate up to 1 degree in Celsius 
Size is Just Right for Any Aquarium
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
Measuring range: 18–34 °C
Place on the tank glass outside the aquarium tank Suitable for cold water, tropical and marine aquarium
Unbreakable and Reusable.

Specification:

Type: Thermometer
Features: Celsius and Fahrenheit 
Material: PET
Color: Black
Temperature Range: 18°- 34°C/ 64°-93℉
Temperature Interval: 2°C/ 2℉
Net Weight: 0.08kg/ 0.18 lbs

Package Includes: 

1/3/5/10 x Sticker Thermometer 

Note:
- Please refer to the measurement. Tiny measuring error is allowable in normal range.
- There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item.