A haemometer (or hemoglobinometer) is used to determine the quantity of hemoglobin in blood. The form proposed in 1902 by Hermann Sahli (1856-1933), a professor of medicine at the University of Bern, in Switzerland, compares the color of the tested blood, treated with hydrochloric acid, with standard colors. The inscription on the case of this example reads “PERFECTED / SAHLI HAEMOMETER / TIP-TOP.”
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