Figure 3. Fuchs Rosenthal Counting Chamber.

A. Two-chamber counting slides (0.200 mm depth; 0.0625 mm²). B. In total the grid contains 16 large squares of 1 mm side, enclosed by triple lines. All 16 large squares are subdivided into 16 small squares of 0.25 mm side. Due to the large counting grid and a depth of 0.2 mm the total volume amount is 3.2 μl, so the chamber factor is 312.5.