At-a-glance temperature display - Our round fish tank thermometer shows the water temperature clearly, so you can quickly notice changes and adjust feeding or habitat conditions without complex readings. Easy, tool-free installation - Adhesive backing sticks to the outside of the tank (glass or acrylic) or other containers, with no tools or mounting hardware required. Stylish and practical design - The round, tasteful form enhances the look of your fish or turtle setup while providing reliable temperature information. Color-changing indicator - A temperature-sensitive color rod offers a simple, visual reading for ongoing monitoring. Practical use scenarios - In freshwater or saltwater aquariums to keep temperatures within the safe range during care and feeding. - On turtle or reptile enclosures to monitor water temperature and basking conditions. - On small outdoor containers or ponds for quick temperature checks without opening the setup.