Method and apparatus for automatically pipetting reagents which avoid contamination of the reagents. The reagents are withdrawn from a reagent bottle via a pipette tip which is unique to a particular reagent. The pipette tip is moved to a cuvette where the reagent is dispensed and then returned to rest...http://www.google.com/patents/US4927765?utm_source=gb-gplus-sharePatent US4927765 - Automatic reagent dispenser
