Both pipette types have a piston that moves in a cylinder or capillary. In air displacement pipettes, a certain volume of air remains between the piston and the liquid. In positive displacement pipetting, the piston is in direct contact with the liquid.
Complete the form and download a pdf version of the GLP Guide.
Air displacement pipetting is highly accurate for standard pipetting applications. However, temperature and atmospheric pressure, as well as the specific gravity and viscosity of the solution, may affect the performance of air displacement pipettes.
Positive displacement pipetting is based on direct contact of the piston with the liquid. The aspirated liquid amount depends on the dimensions of the cylinder or capillary and the movement distance of the piston. In positive displacement pipettes the tips contain both the cylinder/capillary and the piston.
ClipTip technology locks tips firmly in place and ensures a complete seal on every channel with minimal tip attachment and ejection forces using Thermo Scientific™ F1-ClipTip™ Multichannel Pipettes. Newly enhanced volume adjustment allows for a silent, effortless and ergonomic user experience.
California Proposition 65 Warning: Products manufactured with polycarbonate (PC), polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG) or polystyrene (PS) contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.