The ergonomic design of these pipettors enhances comfort, utility and dispensing precision while helping to reduce the risk of injury from repetitive and awkward pipetting motions. This lightweight, affordable device provides accurate, trouble-free pipetting with simple, one-handed operation. The optimally located thumb wheel rotates easily for precision aspirating or dispensing, down to a volume of one drop at a time - all while using a more relaxed grip. The thumb wheel also can be used to "blow out" the pipette. Available in three different pipette volumes, 2, 10 and 25mL, each color coded for easy identification. Resistant to acids, alkalies and most solvents and easily disassembled for cleaning. Overall length 171mm (6.75").