Water temperature is an important factor that affects the health of fish. The
Marina Lcd vertical mount digital thermometer (1.75" 4.45 cm in length) is
accurate and easy to read, it ranges from 18 to 30 degrees C (64 to 86 degrees
F). It comes with an adhesive backing which makes it easy to mount to the
outside glass. Ideal for all fresh and saltwater aquarium setups.