An instrument used to measure the number of red blood cells or estimate the amount of hemoglobin in a blood sample.
From Greek 'haima' (blood) + 'metron' (measure), combining terms for a blood-measuring device used since the 1800s.
Before automated machines, doctors used haematometers to count blood cells one by one under a microscope—a tedious task that might take an hour, now done by computers in seconds.
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