Liquid - handling instruments are key equipment for precise manipulation of liquids in laboratories. Taking pipettes as an example, they use advanced piston - drive technology. By finely adjusting the piston movement, they can accurately control the volume of liquid absorption and discharge, with a wide range of volume capacities to meet the processing needs of different liquid volumes. Their outer shells are mostly a combination of high - strength plastics and stainless steel, which ensures the lightness of the instrument while enhancing its durability and resistance to corrosion from chemical reagents. Their advantages include extremely high precision with minimal errors to ensure the accuracy of experimental data; flexible operation for quick adjustment of volume ranges according to experimental requirements; and good sealing to prevent liquid leakage and environmental pollution. They are widely used in laboratories such as biochemistry, molecular biology, and drug research and development, playing an important role in sample preparation, reagent addition, and solution preparation, and are essential tools for ensuring the smooth progress of experiments.