Easy to install Peel off the backing from the sticker thermometer and remove the front protective film. Stick it to the outside wall of your aquarium. No tools required, and no water contact. Clear, ataglance readings Simple to use and convenient to read. Quickly check the temperature at a glance without opening the tank or opening any vessels. Wide compatibility and flexible use Designed to monitor temperature for aquarium environments as well as other common applications. Suitable for beer and wine barrels, terrariums, greenhouses, and general home use. Works well for any place in your house where temperature monitoring is helpful. Reliable, nonintrusive design Adhesivebacked sticker with a removable protective film on the front for easy mounting. Placed on the outside of glass or walls, it provides temperature information without entering the water or interior space. Practical use scenarios Aquarium outside wall: monitor water temperature indirectly through the glass to help keep fish healthy. Brewing or fermentation: keep beer or wine barrels at the appropriate temperature for results. Terrarium or greenhouse: maintain stable environmental conditions for plants and other pets. Key attributes Function: external temperature indicator for aquariums and other spaces. Compatibility: suitable for aquariums, brewing/fermentation vessels, terrariums, greenhouses, and general home use. Installation: adhesive backing with removable front protective film; no tools required. Performance: clear, easytoread temperature indication for quick checks.