Neubauer’s chamber is a thick glass plate with the size of a glass slide (30x70x4mm). The counting region consists of two square shaped ruled areas. There are depressions or the moats on either side or in between the areas on which the squares are marked thus giving an “ H ” shape. The ruled area is 3mm2 divided into 9 large squares each with a 1 mm 2 area.
https://laboratoryinfo.com/manual-cell-counting-neubauer-chamber/

