Used 0f dropper in laboratory experiments?

Answer 1

Pasteur pipettes, also known as droppers or eye droppers, are used to transfer small quantities of liquids. They are usually glass tubes tapered to a narrow point, and fitted with a rubber bulb at the top. Pasteur pipettes come in various lengths. They are sold in boxes of hundreds, and are generally considered cheap enough to be disposable. However, so long as the glass point is not chipped, the Pasteur pipette may be washed and reused indefinitely. The name eye dropper also may refer to early models of fountain-pens, which had to be refilled with some kind of Pasteur pipette before the invention of rubber sacks, piston devices or the modern ink cartridge.