Test tube

Test tube

Two small test tubes held in spring clamps
Other names	Culture tube
Uses	Chemical reaction
Related items	Vacutainer Boiling tube Centrifuge tube

A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom.

Test tubes are usually placed in special-purpose racks.