Types of Droppers and Graduated Pipettes Graduated Pipettes have many uses. Not only can they be found in the laboratory—nowadays, they can be used domestically for many types of liquids, including eye drops, incense, essential oils, CBD tinctures, and more. What is a graduated pipette vs a dropper? These two go hand-in-hand, for they are both interchangeable terms, with droppers allowing for controlled dispensing. With that said, a pipette, also called a pipet, pipettor, or chemical dropper is a laboratory instrument used to transport a measured volume of liquid. It comes in several designs for various purposes with differing levels of accuracy and precision. Glass and Plastic Droppers The original pipette was made of glass. It is more commonly used in chemistry with aqueous solutions. There are two types of these—the volumetric pipette, which typically has a large bulb and is calibrated for a single volume, and Mohr pipettes, typically straight-walled and graduated for different volumes. However, today, graduated pipettes come in plastic as well. They are more commonly used in both biology and chemistry. These graduated pipettes are also designed for aqueous solutions but not recommended for use with organic solvents which may dissolve the plastic. Both glass and plastic graduated pipettes are sterilized and plugged with a polypropylene bulb at the open end, blocking contamination from the rest of the tube. They also both have been widely adapted to be used not only for science and medicinal purposes but also for domestic purposes too, as aforementioned. Graduated pipettes have become the best scientific tool in both the medical field and in the household. With medical professionals administering medicine using the precise amount, and household parents utilizing graduated pipettes to measure products such as essential oils, pet and child medicine. The Five Grades of Pipettes Besides the known materials for pipettes, there are five grades of pipettes—disposable/transfer, graduated/serological, single-ch