melangeur

noun2

1. •
   A machine for grinding ingredients and mixing them when making chocolate (or rarely nut butter, etc), consisting of roller stones inside a drum.

   • The nib, coarse or finely ground, is mixed with the sugar in a kind of edgerunner or grinding-mixer, called a melangeur. This consists of two heavy millstones supported on a granite floor. — 1921
2. •
   An instrument, essentially a capillary tube with a bulb at one end, for drawing and diluting specimens of blood for examination.