Mechanical pipettes are divided into standard series, advanced series and advanced plus series. The standard and advanced series are semi-autoclaves, and the advanced plus series is a full autoclave. Each series includes a single channel adjustable volume, a single channel fixed volume, an 8-channel adjustable volume, and a 12-channel adjustable volume. Different pipettes can be used for various experiments in some areas like chemistry, biology, etc. Users can choose based on their different needs.