Key benefits Instant, at-a-glance temperature reading: a temperature-sensitive colored bar clearly shows the current water or environment temperature so you can react quickly to changes. Simple, reliable monitoring: no electronics or setup required — the visual color scale makes it easy to check conditions at any time. Wide compatibility: designed for aquariums and other small enclosed habitats, this round adhesive thermometer works for fish tanks, turtle and reptile enclosures, and many non-aquarium uses. What it does and why you need it Maintains animal health: consistent, appropriate temperature is essential for fish, turtles and reptiles. This thermometer gives fast visual feedback so you can adjust heaters or lights before conditions become harmful. Prevents fermentation or crop issues: use it to monitor temperature-sensitive processes such as home beer fermentation or small hydroponic/vegetable tanks to keep results consistent. Eliminates guesswork: the color-coded bar shows immediate changes in temperature, so you don’t need complicated instruments or frequent digital checks. Key features Temperature-sensitive color bar for high sensitivity and fast response to changes. Round design with adhesive patch for easy mounting on a tank wall or other flat surface. Intuitive, color-coded markings that make current temperature and typical ranges easy to interpret. Lightweight and unobtrusive — integrates with most tank setups without taking up space. Compatibility and typical applications Aquariums (freshwater and tropical fish tanks) Turtle and reptile enclosures that require surface-mounted monitoring Homebrew beer fermenters where ambient temperature monitoring matters Small vegetable or hydroponic tanks and other enclosed systems Practical use scenarios Fish tank: Stick the round thermometer to the outside glass near the heater to verify the heater maintains the correct temperature for tropical species. Reptile habitat: Apply the adhesive thermometer to one side of the terrarium to monitor the basking vs. cool zones and adjust lamps or heating pads accordingly. Home fermentation or hydroponics: Mount on the fermenter or nutrient tank to track ambient temperature trends that affect fermentation activity or plant growth. How to use Clean and dry the flat surface where you want to apply the thermometer. Peel off the adhesive backing and press the round patch firmly to the glass or flat surface. Read the colored bar to see current temperature and watch for any rapid color changes that indicate shifting conditions. Why it stands out Practical, no-fuss visual monitoring that helps you protect animals and processes without complex tools. Versatile across aquatic and non-aquatic applications. Compact round design with adhesive mounting for simple, visible placement. Note: Designed as a visual monitoring tool to give fast, easy feedback on temperature. For precision calibration or laboratory-level measurement, use a dedicated digital thermometer.