pipettes (1 and 2) are designed for adding approximate volumes of solutions
or reagents. Some pipettes are graduated so that the 0 reading is at the
top (1). These can be filled up to the 0 mark and the appropriate volume
added. Others have the full volume at the top (2). These can be used by
drawing the correct volume into the pipette and then allowing it to discharge
its contents. Volumetric (bulb) pipettes (3) are designed for accurate work
and the volume will be printed or etched onto the pipette body. Pasteur
pipettes are used for the transfer or addition of small amounts of liquids.
These have no volume markings.