The Hobby Clean Mag Thermo cleaning magnet allows you to quickly and easily clean the inside of your aquarium glass while keeping an eye on the water temperature. The Hobby Clean Mag Thermo is equipped with a strong magnet that adheres securely to aquarium glass up to 6 mm thick. The built-in digital temperature gauge shows you the exact water temperature at all times, so you can always see if your aquarium is within the optimum temperature range. This is especially important for the health of your aquarium inhabitants. The Clean Mag Thermo with digital thermometer is the ideal aid for cleaning your aquarium glass in a flash, without the hassle of getting your hands wet. This saves time and effort, and clean glass means a better view of the underwater world and more enjoyment from your hobby.Hobby Clean Mag Thermo+ ideal helper for a clean aquarium+ cleaning magnet with digital temperature display+ quick and easy cleaning of aquarium glass+ the magnet adheres securely to aquarium glass