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 mm 2 Group square: 0.04 mm 2 Small square: 0.0025 mm 2 Counting chamber Neubauer improved Bright lines, 2 spring clamps The grid structure is incorporated in a very thin, transparent metal layer. The bright lines contrast well with the darker, metallic background, which simplifies the evaluation of cell suspensions.Spring clamps securely fix the coverslip to the counting chamber. In vitro diagnostic medical device class A Delivery incl. two haemocytometer coverslips (20 x 26 mm).