It is a clamp that holds a test tube -- for instance to hold a test tube while heating it without getting burned. It is made from a thick piece of metal wire that is shaped into a spring-loaded clamp to securely hold a test tube.
Note the difference between a test tube clamp, and a test tube rack. A clamp is a way to hold a single test tube without actually touching the test tube itself. A rack is instead used to hold many test tubes at once in an upright position. See the Related Questions links to the left for more information on test tube racks.
See the Web Links to the left for a picture of a test tube clamp.
First answer by JEK. Last edit by JEK. Contributor trust: 1774 [recommend contributor]. Question popularity: 14 [recommend question]
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