Patent ID: 8561485

Claim:
A hand-held pipetting device, comprising a housing, a pipette receptacle coupled to the housing for a replaceable pipette, the replaceable pipette received with a first end in the pipette receptacle and having a tip at a second end, a negative pressure source for aspirating a liquid, an overpressure source for dispensing an aspirated liquid, an air line which connects the negative pressure source and overpressure source with the pipette receptacle, a valve system which is at least partially electrically controllable and which is arranged within the air line, an aspirating button coupled to the housing, a dispensing button, a light source coupled by an illumination support to the housing at a relatively short distance to a longitudinal axis of the pipette receptacle, an optical system coupled to the light source which generates a light cone from light emanating from the light source, the light cone illuminating the tip of the replaceable pipette and an area proximate the tip of the replaceable pipette and having a longitudinal axis that is substantially parallel to a longitudinal axis of the pipette receptacle, and first electrical contacts on an outside of the housing which can be tapped from outside and which interact with second electrical contacts arranged on the illumination support, a connection between the first electrical contacts and the second electrical contacts interrupted when the illumination support is in a first position, and closed when the illumination support is in a second position.