Pipettes are widely used as instruments for moving small amounts of liquid in chemistry laboratories. Compared with glass pipette, the pipette is easy to operate and can greatly improve the efficiency of inspection and detection, so it is favored by experimental workers. However, there has always been a phenomenon of heavy use and light management of pipettes, most laboratory inspectors directly use adjustable pipettes without training, and the verification cycle of pipettes during most laboratories is one year or half a year. The system error caused by the environment and operation of the pipette is extremely obvious, which may eventually lead to deviation of the detection results.