You searched for: “leukocytometer
leucocytometer, leukocytometer (s) (noun); leucocytometers; leukocytometers (pl)
A specialized and standardised glass slide which is adapted to count the leukocytes: Dr. Lawson, an expert in the application of a leucocytometer, made sure that the measured volume of of precisely diluted blood was close at hand for calculating the leukocytes.