Hematology analyzers (also spelled haematology analysers in British English) are used to count and identify blood cells at high speed with accuracy.[1][2][3] During the 1950s, laboratory technicians counted each individual blood cell underneath a microscope. Tedious and inconsistent, this was replaced with the first, very basic hematology analyzer, engineered by Wallace H. Coulter. The early hematology analyzers relied on Coulter?s principle (see Coulter counter). However, they have evolved to encompass numerous techniques.