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Instruments designed for automated or semi-automated transfer of programmed volumes of liquids from one container to another container. Pipettors typically consist of powered (e.g., electronic) benchtop or manually operated handheld devices that can transfer (i.e., dispense) very small, pre-established volumes of liquid (usually from 0.1 microliter to several milliliters). Some pipettors include detachable disposable tips. Most pipettors work by displacing a plunger in a cylinder but other mechanisms are used in some electronic units. Single-channel and multichannel pipettors are used in clinical laboratories; they improve the precision of measurements and lessen the possibility of cross-contamination among samples when compared with manual pipetting procedures.
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