English to Spanish Science Chemistry; Chem Sci/Eng Laboratory equipment

Apparently, this is a component or feature of 'variable volume pipettes'. This is the context:

Accurate and reliable pipetting: reverse pipetting option for accurate and precise aspirating and dispensing of viscous liquids / innovative soft grip prevents transfer of heat to internal components, ensuring accurate pipette operation / lock counter mechanism of variable volume pipettes prevents volume changes while pipetting / blow out system allows last drop dispensing

Many thanks!!

Carlos C.