Droppers are laboratory tools that are used to dispense small and precise volumes of liquids. They consist of a glass or plastic tube with a narrow opening at one end and a bulb or pipette at the other end. The bulb or pipette is used to draw up the liquid, and the liquid is dispensed through the narrow opening by squeezing the bulb or releasing the pressure on the pipette.
Droppers are available in various sizes, from small micro-droppers for dispensing very small volumes, to larger droppers for dispensing larger volumes. Some droppers also have a graduated scale marked on the side, which allows for accurate measurement of the volume being dispensed.