This flexible and easy-to-use Dual Scale Liquid Crystal Thermometer reads temperature between 39-97 degrees Fahrenheit (4-36 degrees Celsius). It comes with a waterproof self-adhesive that sticks to glass, plastic, and metal. Once attached to the fermentation vessel, it will illuminate the temperature. The thermometer comes with a protective film that can be removed once installed. It measures 0.71" x 5" (1.8 x 13 cm).