The ruling shows nine large squares of 1 mm². The marked 'L' 4 large squares in the corners are divided into 16 squares with 0,25 mm sides. They are used for counting leucocytes.

• The large square in the middle is subdivided into 25 squares each with a side length of 0,2 mm
• Each group square consists of 16 smaller squares each with 0,05 mm sides and an area of 0,0025 mm²
• The five group squares in the central large square are used for platelets and red blood cell count

Deserves special attention that all group squares have triple boundary lines. The middle line is limiting line and determines whether cells in the border area are counted or not.