The hemocytometer is used by putting the cover slip on the device, and filling the space with a liquid containing the cells you want to count. There is a "V" or notch at either end which is the place where the cell suspension is loaded into the hemocytometer. The fluid is usually drawn into the space by capillary action. A cover glass, which is placed on the sample, does not simply float on the liquid, but is held in place at a specified height. In addition, the grid arrangement of squares of different sizes allows for an easy counting of cells. It is possible to identify the number of cells in a specified volume by this method..