If you ever visited a medical laboratory 25 years ago, you would have probably found a med tech looking through a microscope,using a hand tally counter calculating white cells, red cells, or platelets. Or, they might have been using a sorting counter for differentiating white cells. Nowadays in America, most of this work is done using automated ^equipment. In developing third world countries, they still use the old method. Hand tally counters cost $40 and sorting counters run about $600.
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