Neubauer counting chamber improved, 9 large squares, with 2 spring clampsNeubauer counting chamber improved, 9 large squares, with 2 spring clamps Material: glass. For leucocyte, thrombocyte and erythrocyte counting. Double counting grid. Counting grid with nine large squares. The four corner squares are used for leucocyte counting. The smallest square in the centre is split into 25 group squares and these in turn are split into 16 small squares. Five of the group squares are used for erythrocyte counting. Large square: 1