A pipette (also known as a volumetric pipette) is a commonly used laboratory glass instrument for accurately transferring specific volumes of solution. It is widely used in titration analysis and quantitative control experiments. The tube is widened in the middle, with a pointed tip at the bottom and markings at the neck. Precise quantitative transfer is achieved by controlling the liquid level. Common sizes include 5, 10, 25, and 50 mL.