uxcell Aquarium Fish Tank Spiral Handle Test Pipe Tube Washing Brush Cleaner 3 in 1 The test tube brush is not only suitable for test tubes, also fit for cleaning all sorts of surfaces. After you finish your experiment, you can clean your test tube with it, very convenient. Suitable for laboratory test tubes, the nylon bristles are great for cleaning all sorts of surfaces. Convenient and practical. Comfortable and easy to use.