Do you want the user to be able to perform calibration? If yes, ensure that this is possible and that it is easy to do. If the user will clean the pipette, it should be easy to disassemble and have as few removable parts as possible. The easiest pipettes to clean have only three removable parts and can be disassembled without tools. If you plan to use external calibration and maintenance services, check the location of the closest service center, as well as the quality, cost, and speed of their services.