Counting chamber, Fuchs-Rosenthal / Hecht, Karl / Assistent

With double ruling. Without snap-on clips. Calibratable.
Cell depth 0.2mm. Grid has 16 x large 1 mm² squares. Each square is divided into 16 smaller squares each with a side length of 0.25mm and an area of 0.0625mm². These counting chambers are commonly used to count cells in cerebrospinal fluid.