A historical medical instrument used to measure blood or blood cells, or to count red blood cells and other blood components.
From Greek 'haima' (blood) + 'metron' (measure). This term emerged in the late 1800s as doctors developed early tools to count and measure blood components.
Early hematometers were incredibly crude—some used grid patterns under the microscope to count cells by hand—and modern automated blood counters that do millions of counts per second evolved directly from this invention.
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