Portable Pipet-Aid XL has a long lightweight handle, which lowers the arm lift required to perform the same pipetting operation as with a conventional pipettor. The lower, more comfortable arm position reduces shoulder and neck strain, particularly when working under a hood. The ergonomic design includes an adjustable hand rest and a removable stand which enables the unit to be set down without contaminating the pipet. A quiet, efficient pump reduces noise and extends operation period between charges. Three-speed settings provide more precise control for both aspirate and dispense modes.