A graduated pipette commonly used in medical technology with serologic pipettes for volumetric analysis. Typically the pipettes are vertically stored on holder called pipette stands. The most advance pipette stand can directly control electronic pipettes. Graduated pipettes are considered to be more precise than the Pasteur pipette. Instruments required are a computer-controlled robotic pipette and a centrifuge. Sterile technique prevents liquid from coming into contact with the pipette itself. The remaining solution (supernatant) may be discarded with a pipette.. A special pipette used in measuring viscous fluid such as whole blood. Rinsing the pipette before use is required to prevent error. Pipetters with disposable plungers and extra-long pipette tips should be routinely used. A Serological pipette is designed for use as a blow-out pipette. A graduated pipette is a pipette with its volume, in increments, marked along the tube. To make these recordings, the patch pipette is compared to the ground electrode. A normal sample leaves the pipette in small discrete drops. This reduces the concern of liquid remaining in the pipette.