Provides fast, efficient, and accurate one-handed control of manual pipetting operations. Each unit can be used with glass or plastic to deliver or to contain pipets from 0.1 to 100mL. Aspiration and dispensing are easily controlled by a single rocker-switch rather than a fatiguing thumbwheel. Constructed of chemical-resistant materials and easily disassembled for cleaning; a replaceable hydrophobic filter (17753-594) acts as a barrier for safety and sterile pipetting. Pipet connection components and filter can be autoclaved.