BrandTech Transferpettor Single Channel Positive Displacement Pipette, 100-500 uLThe Transferpettor Positive Displacement Pipette is the best tool for many liquids that render traditional air-displacement pipettes ineffective. Unlike air displacement pipettes, the piston of the Transferpettor directly contacts the media, wiping the tip walls clean as the media is expelled. This results in negligible wetting and highly accurate, reproducible results, especially with viscous, foaming, high-vapor-pressure, and other problematic liquids.