Source : Webster's Revised Unabridged Dictionary (1913)

Haemochromometer \H[ae]m`o*chro*mom`e*ter\, n. [H[ae]mochrome +
   -meter.] (Physiol. Chem.)
   An apparatus for measuring the amount of hemoglobin in a
   fluid, by comparing it with a solution of known strength and
   of normal color.