Haemocytometer
Haemocytometer is used to count the blood cells. It has a glass microscope slide that has a central chamber that has a grid. It is done by preparing the sample, then loading it in the hemocytometer. Then counting of the cells are done under a microscope and then the concentration of the cells are calculated.
So, the correct answer is (A): Haemocytometer
Read More: Fundamental Unit of Life: Cell
The different parts of a cell and their functions are as follows: