pipette
Laboratory tool used in chemistry and biology to transfer fixed quantities of liquid.
Most pipettes depicted in anime-related art are pasteur pipettes, consisting of a tapered glass (sometimes plastic) tube with a bulb on one end that is depressed to draw in and dispense liquids. The overall shape resembles an oversized eye dropper, and the pipette is sometimes referred to as such.
The following tags implicate this tag: holding_pipette (learn more).