Boyu Magnetic Cleaner With Thermometer [WD-Series]Magnetic Scraper Boyu WD-Seriesis designed to clean the glass (up to 12 mm) of the aquarium without damaging the glass.Equipped with a digital thermometer to determine the temperature anywhere in the aquarium.When separated from the outer part, the submersible part floats to make it easier to remove from the aquarium. Sizes:S : 10.4×4.3×6.2cmM : 11.4×4.7×6.8cmL : 12.85×5.3×7.4cm