Manufactured according to DIN 12 847, including 2 haemacytometer cover glasses. Combination of the Bürker and Thoma systems.The ruling shows 9 large squares of 1 mm² each. The large squares are subdivided into 16 group squares with 0.2 mm sides. in the central large square, each group square is subdivided into 16 mini squares with 0.05 mm sides (= 0.0025 mm²). BLAUBRAND® quality Outstanding measurement precision 100%  certified quality Manufactured according to DIN 12 847, including 2 haemacytometer cover glasses. Combination of the Bürker and Thoma systems.The ruling shows 9 large squares of 1 mm² each. The large squares are subdivided into 16 group squares with 0.2 mm sides. in the central large square, each group square is subdivided into 16 mini squares with 0.05 mm sides (= 0.0025 mm²). BLAUBRAND® quality Outstanding measurement precision 100%  certified quality