The function of a test tube brush is the clean test tubes used in a science laboratory. Test tube brushes are also useful in cleaning aquarium tanks. They consist of twisted wire handles connected to bristles that are made of Nylon or a similar material such as Tynex.
Test tube brushes come in a variety of sizes to accommodate the tubes they are designed to clean. Some examples of sizes that may be used include those deigned for tubes of 11 millimeters, 13 to 18 millimeters and 18 to 25 millimeters in diameter. When used to clean aquarium tanks, test tube brushes remove slime and algae from the filtration system.