Abstract: A method for manufacturing a measuring capillary, wherein in each of a number of substantially plate-shaped parts 1, a recess 2, 3 is formed. The shape of the recesses 2, 3 is such that when said plate-shaped parts 1 are superposed with the recesses 2,3 facing each other, said recesses 2,3 define the capillary. The walls of the recesses 2, 3 and at least the plate surface portions directly adjacent thereto are coated by a substance. The plate-shaped parts 1 are superposed such that the recesses 2, 3 formed therein together define a capillary and the plate-shaped parts 1 are secured to each other.