A test tube holder is used to hold test tubes.[1] It is used for holding a test tube in place[2] when the tube is hot or should not be touched.[3] For example, a test tube holder can be used to hold a test tube while it is being heated.[4] Moreover, when heating the tube with liquid or solid contained inside, the holder ought to tightly hold a test tube[5] in order for the tube to be safely held while heating.[6]
Particularly, for liquid heating, when holding a test tube holder with a test tube, hold it such that it aligns with the lab bench and also point the open end of the tube away from yourself or anyone nearby.[7]
Additionally, while using a test tube holder, the proper distance between the test tube holder and the top of the test tube is approximately 3 centimetres.[8]
Structurally, jaws of a test tube holder are self-closed by a spring and can be manually adjusted.[9]
The purpose of a test tube holder is to be used only to hold a test tube as it is not structured for flasks or other heavier objects. It also is used when wanting to burn something small that cannot be held using your hand.[10]