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use to hold test tube..
You could use a Red/Gray SST tube, or you could use a Green sodium heparin tube.
Test tube rack is use to hold test tube when they are not in use.
In chemistry, it is use to transfer chemicals from tube to tube
A geiger-mueller tube is used in the detection of ionizing radiation.
Gray top tube (GTT) is typically used for glucose tolerance test.
When heating a test tube, you would use a test tube holder. It can also be used to hold/ support pipettes, etc. http://www.answers.com/mt/test-tube-holder
A light blue tube is typically used for a prothrombin time (PT) test.
The color tube you use when drawing blood for a lab test depends on the type of test you are running. For a Na blood test you would use a red tiger strip tube.
A lavender/purple-top tube is commonly used for calcium testing.
A lavender-top tube containing EDTA is typically used for ferritin testing. This anticoagulant is used to prevent clotting of the blood sample.
To help clean used test tubes.