Distributed by Vanguard International, the Proline is available in five separate models that cover a total volume range of 0.5 µl to 5 ml. Volume is adjusted by turning the piston knob; each incremental change is accompanied by an audible "click" that sets the volume. The digital display window is located on the side of the barrel and is visible during right-handed use. Tip ejection is achieved by depressing a thumb-controlled button on the back of the handle, and a balancing hook on the front provides finger support. Another feature is the inclusion of black tip cones, which are chemical resistant and allow for visualization of a proper seal with the tip. Each unit includes a bench-top mounting holder for pipette storage and a calibration tool.

The main advantage of the Proline is its lack of bulk-it is one of the lightest of the pipetters evaluated for this article. Many...

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