Sera Glass Cleaner 2in1 cleaner+thermometer
These magnets make cleaning the aquarium glass easy. Sera glass cleaner can not only clean the glass but it also shows the water temperature. 2in1 cleaner + thermometer.
The cleaning surface of the inner part removes the algae layers. The surface of the outer magnet is covered with a particularly fine synthetic matt that protects the glass. The magnets have an oar that allows attaching a piece of string for retrieving it.