Choosing the right pipettor and pipette tips is one of the most important decisions a laboratory can make, because these tools can directly affect the accuracy, precision, and reproducibility of liquid handling steps in a workflow. From clinical diagnostics to research and quality control, the wrong combination of pipettor and tip can introduce measurement error long before a sample reaches analysis. This guide explains what to look for when selecting pipettors and pipette tips, how the two work together, and how to keep them performing reliably over time.
What Is a Pipettor Used for in a Laboratory?
A pipettor is a handheld or motorised instrument used to accurately measure and transfer small volumes of liquid between vessels. It is essential wherever precise volumes matter, including diagnostic testing, sample preparation, dilution series and reagent dispensing across clinical, research and industrial laboratories.
Pipettors work by creating a controlled air displacement, either through manual plunger action or an electronic motor, which draws liquid into a disposable tip and dispenses it with minimal variation. Air displacement pipettors are widely used for general laboratory work, suited to aqueous solutions and general-purpose work. Positive displacement pipettors, by contrast, use a piston that contacts the liquid directly, making them better suited to viscous, volatile or hazardous samples where air displacement can introduce inaccuracy. Selecting the correct mechanism for the sample type is the first step in reliable liquid handling.
What Volume Range Should I Choose for My Pipettor?
The correct volume range depends on the smallest and largest volumes routinely handled in your workflow, with most laboratories requiring at least two or three pipettors to cover microlitre and millilitre ranges accurately. Using a pipettor near the bottom of its range increases relative error.
Common ranges include 0.1 to 2.5 microlitres for ultra-low volume work such as PCR setup, 2 to 20 microlitres for concentrated reagents, 20 to 200 microlitres for general dilution and sample transfer, and 100 to 1000 microlitres for bulk reagent handling. A laboratory that regularly moves between these volumes benefits from a fixed volume option, such as the Livingstone adjustable and fixed-volume pipettor, alongside adjustable models for flexible workflows. Matching pipettor range to actual sample volumes, rather than defaulting to one general-purpose device, reduces the risk of systematic error across a testing batch.
Should I Use a Manual or Electronic Pipettor?
Manual pipettors suit low-throughput tasks and offer tactile control at a lower cost, while electronic pipettors reduce repetitive strain and improve consistency for high-volume or repetitive pipetting tasks. The choice depends on sample throughput and ergonomic risk.
Manual pipettors remain the standard choice for most laboratories because they are affordable, simple to maintain and require no charging or programming. However, laboratories processing large batches, such as pathology services or high-throughput research facilities, often move to electronic pipettors to reduce thumb and wrist strain associated with repeated plunger action. Repetitive manual pipetting has been linked to musculoskeletal disorders, and workplaces have a duty to manage this risk under Australian work health and safety law. Electronic and multichannel pipettors can also improve throughput and reduce variation between operators.
How Do I Choose the Right Pipette Tips for My Pipettor?
Pipette tips must be matched to the specific pipettor model and volume range, since even minor variations in tip taper or fit can cause air leakage and inaccurate volume delivery. Using manufacturer-recommended or verified compatible tips is essential for reliable results.
Beyond fit, laboratories should consider whether filtered tips are required to prevent aerosol contamination during PCR or infectious sample handling, whether low-retention tips are needed for viscous or precious reagents, and whether sterile, individually wrapped tips are necessary for clinical or molecular applications. Colour-coded tips corresponding to volume range also reduce the risk of selecting the wrong tip during high-pressure workflows. Livingstone’s range of pipette tips covers standard, filtered and low-retention options suited to a variety of pipettor brands and laboratory applications.
Why Does Pipettor and Tip Compatibility Matter for Accuracy?
Compatibility affects the seal between tip and pipettor shaft, and a poor seal is a common cause of pipetting error, alongside incorrect technique and lack of calibration. Even a well-maintained pipettor cannot deliver accurate volumes if the tip does not form an airtight fit.
An ill-fitting tip can allow air to enter the system during aspiration, resulting in under-delivery or dripping. This is particularly critical in quantitative applications such as serial dilutions, enzyme assays, and diagnostic testing, where small volume errors compound across a workflow. Laboratories should always test new tip batches against their existing pipettors before adopting them for routine use, especially when switching suppliers.
How Often Should Pipettors Be Calibrated?
Most laboratories should calibrate pipettors every three to twelve months depending on usage frequency, criticality of results and internal quality requirements, with high-throughput or accredited laboratories often calibrating quarterly. Regular calibration maintains traceability and confidence in reported results.
Calibration should follow a gravimetric method, checking accuracy and precision across the pipettor’s working range. Accredited, regulated, or quality-controlled laboratories are generally expected to demonstrate metrological traceability for their equipment. Between formal calibrations, a simple gravimetric spot check using a calibrated balance can help identify pipettors that are drifting out of tolerance.
What Maintenance Extends the Life of a Pipettor?
Regular cleaning, correct storage and prompt servicing after any sign of inconsistent dispensing extend a pipettor’s working life and preserve accuracy. Neglecting maintenance is a common cause of premature failure and calibration drift.
Pipettors should have their exterior wiped down after each use, with internal decontamination carried out according to the manufacturer’s instructions. Stored vertically on a stand were recommended by the manufacturer rather than lying flat and never used past their rated maximum volume. Any resistance in the plunger, visible droplets after dispensing, or inconsistent readings during routine checks should prompt immediate servicing rather than continued use, since compromised pipettors can silently affect results for weeks before the issue is noticed.
Selecting the right pipettor and pipette tips is not a one-off purchasing decision but an ongoing part of laboratory quality management. Matching volume range, mechanism and tip compatibility to actual workflow needs, combined with a consistent calibration and maintenance schedule, gives laboratories the confidence that every measured volume is accurate. Livingstone supplies a range of pipettors, and pipette tips suited to clinical, research and educational laboratories across Australia.
References
NATA (n.d.) Laboratory Accreditation to ISO/IEC 17025. Available at: (Accessed: 21 August 2026).
