provide the decisive advantage when protecting pipettes and samples against contamination. They therefore contribute decisively to extending the service life of pipettes. If replaced regularly, the filters provide excellent protection for the internal components of the pipette. Use of filter tips to prevent cross contamination of liquid samples or vapours when pipetting radioactive, biohazardous or corrosive samples is standard practice today. The safety filters can serve as additional protection in this respect against the penetration of liquids into the interior of the pipette.