Test tubes are hand held tubes used for compounding or heating chemicals in a laboratory. A test tube also known as a culture tube or sample tube, may be a common piece of laboratory Connection consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom. Lab Connection is the leading in Test Tube Manufacturer, Test Tube Suppliers, Test Tube in India, Test Tube Exporter, Test Tube, Glass Test Tube, Laboratory Test Tubes, Borosilicate test tubes.