A 3-part hematology analyzer bought from Hematology Analyzer Suppliers usually uses impedance to separate WBC into granulocytes (mainly neutrophils, but also eosinophils and basophils), lymphocytes, and MID cells (mostly monocytes) founded on cell size. Each cell passing over the aperture causes a drip in the electrical current (a beat). The number of produced beats is associated with the number of cells, whereas the extent of the beat is connected to the cell size