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Contact SupplierTest tubes are important pieces of laboratory equipment and have a wide variety of uses in the laboratory. They are very basic in structure, but useful in many different fields of science. Test tubes are slender containers that hold small amounts of liquid and are used in scientific experiments. They can range between 50 mm to 250 mm in length and 13 and 20 mm in width. Test tubes are usually made of glass or plastic, but the ones that are made of glass are able to be used in heat-up situations. These tubes may also be known as boiling tubes, as they can be used to raise solutions and reactions to boiling temperature.