Manufactured according to DIN 12 847, including 2 haemacytometer cover glasses. Rulings correspond to the central large square of the Neubauer chamber. The mini squares have an area of 0.0025 mm² each. Since the outer large squares are not completed, the Thoma chamber is only used for counting thrombocytes and erythrocytes. BLAUBRAND® quality Outstanding measurement precision 100%  certified quality Manufactured according to DIN 12 847, including 2 haemacytometer cover glasses. Rulings correspond to the central large square of the Neubauer chamber. The mini squares have an area of 0.0025 mm² each. Since the outer large squares are not completed, the Thoma chamber is only used for counting thrombocytes and erythrocytes. BLAUBRAND® quality Outstanding measurement precision 100%  certified quality