$2.50
Now in two versions to choose from, Celsius (only) and combined Fahrenheit/Celsius. Reads temperatures between about 4 and 36 ºC (39 and 97 ºF).
Comes with a waterproof self-adhesive that sticks to glass, plastic and metal. Once attached to the carboy it will illuminate the temperature. Flexible and very easy to use.
Comes with a protective film that can be removed once installed.
Size: 5″.