Pipettes and liquid handling equipment are the most-used tools in most laboratories. Analysts, clinical technicians, QC labs and research groups rely on them to transfer volumes from microliters to hundreds of milliliters, and every downstream result inherits whatever error the transfer introduced. Because a pipette is handled hundreds of times a day, ergonomics and calibration stability matter as much as headline accuracy.
Types of liquid handling equipment
Air-displacement pipettes are the standard choice for aqueous samples and cover most routine work. Positive-displacement pipettes handle viscous, volatile or dense liquids where an air cushion would cause errors. Repeating (stepper) pipettes dispense the same aliquot many times from a single fill, which speeds up plate loading. Multichannel pipettes (8- and 12-channel) are built for 96-well microplate work. For bulk reagents and solvents, bottle-top dispensers mount directly on the reservoir bottle and dispense repeatable volumes without decanting. Electronic pipettes add motorized aspiration, programmable modes and reduced thumb strain for high-volume users.
Key factors to consider
- Volume range and resolution. Choose a pipette whose nominal volume sits close to the volumes you dispense most often. Accuracy is specified as a percentage of nominal volume, so using a large pipette at the bottom of its range is one of the most common sources of error in the lab.
- Single-channel vs. multichannel. If you run microplates regularly, a multichannel pipette pays for itself quickly in time saved and in reduced row-to-row variation. For general bench work, a set of single-channel pipettes covering overlapping ranges is more flexible.
- Sample properties. Viscous samples, organic solvents, and liquids that foam or have high vapor pressure often need positive-displacement pipettes or solvent-compatible bottle-top dispensers with appropriate seal and valve materials. Confirm chemical compatibility before buying.
- Ergonomics and duty cycle. Plunger force, tip-ejection force and weight add up over a long day. If technicians pipette for hours, electronic or low-force manual models meaningfully reduce repetitive strain risk.
- Tip fit and consumable cost. Some pipettes require the manufacturer's own tips for stated accuracy; others accept universal tips. Since tips are an ongoing expense, factor consumable cost and availability into the total cost of ownership, not just the instrument price.
- Calibration and service. Look for models that can be user-adjusted and fully autoclaved, and check whether calibration service is available locally. Regulated labs should verify that documentation supports their ISO or CLIA requirements.
Practical tips
Pre-wet the tip before the first dispense, hold the pipette vertically during aspiration, and keep a consistent plunger speed. Store pipettes upright on a stand so residual liquid cannot run into the shaft. Verify performance gravimetrically on a balance at regular intervals, and always after a drop or repair. For bottle-top dispensers, purge air from the discharge tube before the first dispense of the day and check valve seating if delivered volumes drift.
Explore our range of pipettes, bottle-top dispensers and liquid handling equipment to find the right fit for your workflows. If you verify dispensed volumes gravimetrically, pair your liquid handling setup with a suitable pipette calibration balance for routine accuracy checks.