A test tube rack is a piece of laboratory equipment used to hold multiple test tubes upright at the same time. They are especially useful for organizing test tubes when different solutions are being worked on or collected at once. Test tube racks also provide protective storage for test tubes and make transporting and cleaning test tubes much easier. A laboratory rack for test tubes is also very important in providing safe and efficient environments for physicians, researchers, and scientists to work in without risk of contamination or broken test tubes..