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Pipette Graduated - 5ml, 10ml, 25ml with Pipette Bulb 3No. A pipette is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, Pipette bulb (Rubber bulbs) are used in chemistry laboratories, by placing them on top of a glass or plastic pipette. It serves as a vacuum source for filling reagents through a pipette and also help control the flow of liquid from the dropping.