How Long Is a Test Tube

The clear plastic test tubes measure 18 cm (7″) tall, 4.5 cm (1.75″) in diameter. Each tube holds a whopping 240 mL (8 ounces) of liquid.

How long is the average test tube?

Test Tubes – Standard (15 x 150mm), pk of 12 : United Nuclear , Scientific Equipment & Supplies.

How are test tubes measured?

You can get a reasonably accurate measure of volume by measuring the internal diameter of the tube and the height of the liquid. The best way to measure the diameter of a test tube is to measure the widest distance between the inside glass or plastic surfaces.