A transfer pipette, or transfer pipet, is a plastic pipette specifically designed to transfer a quantity of liquid. Used in laboratories, classrooms, and research facilities, transfer pipettes are usually composed of polyethylene or low-density polyethylene (LDPE), which are chemically inert and heat sealable for freezing, long-term storage, or transport. While the bulb on some transfer pipettes functions as a measuring device that transfers a specific liquid volume, most transfer pipettes have low accuracy and provide only rough measurements. Capacity ranges from a few microliters to several milliliters. Plastic pipettes are economical, disposable, and available in a variety of styles and capacities, including sterile or non-sterile varieties. Features to consider when choosing a transfer pipette include capacity, properties of the liquid being transferred, required accuracy, specific volume measurement capability, and quantity.