Which type of pipette is considered the most accurate?

The volumetric pipette is regarded as the most accurate type of pipette used for measuring liquid volumes. This precision stems from its design, which is specifically engineered to deliver a single, fixed volume of liquid with minimal error. The shape of the volumetric pipette, characterized by its long neck and a bulbous body, helps create a uniform fluid column and reduces the effect of parallax during volume readings, ensuring a high level of accuracy.

In contrast, graduated pipettes can measure variable volumes but may not achieve the same level of precision as volumetric pipettes due to their scale divisions and possible user variability in reading them. Transfer pipettes are generally used for transferring liquids rather than for precise measurements, leading to less accuracy in volume delivery. Micro pipettes are excellent for small volumes, but their accuracy can vary depending on the specific design and the technique used. Hence, the volumetric pipette stands out for its reliability in delivering exact measurements, making it the preferred option when high accuracy is required.