One major source of contamination is the volumetric pipette. Since usual glassware washers are expensive and large, chemists designed a device that could be hooked up to a waterline to allow the flow of water or other liquid through the inside and over the outside of the pipettes. As a result, less time is spent cleaning pipettes, and more time conducting research. The pipette washer/dryer is easy to use. Simply insert multiple pipettes at a time, close the door and attach the tubing to the wash or rinse line. The washer can also be used with the washer basin and pump to circulate wash or rinse solution through the pipettes.