Measuring cuvette for counting and/or characterizing cells

A measurement cuvette comprising a base and a transparent lateral enclosure extending from the base so as to form therewith an optical measurement chamber;

• the base having a through-orifice of 30 μm to 100 μm in diameter for cells to pass through, wherein the base and the transparent lateral enclosure form a one-piece cuvette suitable both for impedance measurement and for optical measurement, wherein the base has an upper surface that penetrates inside the optical measurement chamber as a frustoconical shape having a first end of a greater radius positioned proximate to where the transparent lateral enclosure extends from the base, a second end of a lesser radius comprising a surface, and between the first end to the second end extends a lateral surface, wherein the upper surface is formed by the combination of the lateral surface and the surface of the lesser radius, and the through-orifice traversing the base at a portion thereof of the surface of lesser radius of the upper surface.