A test tube, also known as a culture tube or sample tube, is a common piece of ... blue top tube Citing: McGraw-Hill Concise Dictionary of Modern Medicine.
Test tube holders are used to distance a person from potentially dangerous tasks
when using chemicals in test tubes. ... What is the
a hollow cylinder of thin glass with one end closed, used in chemical and
biological experimentation and analysis. Origin Expand. 1840-50.
Used to plug a flask or testtube for safe keeping. Test Tube. Used to mix, heat, or
Exporter of Chemistry Lab Instruments - Test Tube Brush,