Counting chambers, BLAUBRAND®, improved Neubauer, without clips, double ruling

The counting net shows 9 large squares of 1 mm² each.
The 4 large squares marked "L" in the corners are divided into 16 squares each with a side length of 0.25 mm. They are used for leukocyte counting.
The large square in the middle is divided into 25 group squares, each with a side length of 0.2 mm. Each group square consists of 16 small squares, each with a side length of 0.05 mm and an area of 0.0025 mm².
The 5 group squares in the middle large square are used for platelet and erythrocyte counting. Particular attention should be paid to the fact that all group squares have triple border lines on all sides. The middle line is the boundary line and decides whether cells in the boundary area are to be counted or not.