Material: glass. Double counting grid. Counting grid with nine large squares. The smallest square in the centre is split into 16 group squares and these in turn are split into 16 small squares. Large square: 1 mm 2 Group square: 0.04 mm 2 Small square: 0.0025 mm 2 Counting chamber Neubauer 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 clips securely fix the coverslip to the counting chamber. In vitro diagnostic medical device class A Delivery incl. two haemocytometer coverslips (20 x 26 mm).