Celloscope automated cell counter was developed in the 50s for enumeration of erythrocytes, leukocytes, and thrombocytes in blood samples.[1] Together with the Coulter counter, the Celloscope analyzer can be considered one of the predecessors of today's automated hematology analyzers, as the principle of the electrical impedance method is still utilized in cell counters installed in clinical laboratories around the world.[2][3]