Counting chambers with dark line
A counting chamber is a precision measuring instrument made of special optical glass. It is used to count cells or other particles in suspensions under a microscope. Counting chambers are mainly used for counting blood cells (e.g. leucocytes, erythrocytes, thrombocytes, …) and cells in fluid of the brain and spinal cord. Furthermore, counting chambers are also used to count bacteria, sperm and fungus spores.
Dark lines: Standard counting chambers have counting grids which are engraved into the chamber bottom.