Cuvette, comprising a first flat plate ( 1 ) and a second flat plate ( 2 ), both of which in a closed state of the cuvette are positioned so as to be situated opposite parallel to each other and at which there is at least one transparent first measuring surface ( 1.1 ) and at least one transparent second measuring surface ( 2.1 ), which define in pairs a measuring space ( 3 ), in which a liquid sample solution having a drop volume can be held by means of its surface tension and capillary forces. At least the second measuring surface ( 2.1 ) of each one of the measuring spaces ( 3 ) is a stepped surface, which has at least two plane-parallel partial measuring surfaces ( 2.1.1, 2.1.2 ), which are connected to each other by means of a setting surface ( 2.1.0 ), so that the partial measuring surfaces ( 2.1.1, 2.1.2 ) exhibit different vertical distances (b 1 , b 2 ) from the first measuring surface ( 1.1 ).
1. A cuvette, comprising a first flat plate having a first inner surface and a second flat plate having a second inner surface, wherein in a closed state of the cuvette the first and second inner surfaces are positioned so as to be situated opposite and parallel to each other at a first vertical distance; and inside the first inner surface there is at least one transparent first measuring surface and inside the second inner surface there is at least one transparent second measuring surface, both of which define in pairs a measuring space, in which a liquid sample solution having a drop volume can be held by means of its interfacial tension and capillary forces,
said at least one second measuring surface of said measuring space is a stepped surface, said stepped surface having at least two plane-parallel partial measuring surfaces which are connected to each other by means of a setting surface, wherein said partial measuring surfaces are spaced from said first measuring surface by second and third vertical distances respectively, said second and third vertical distances being different from each other, and wherein the setting surface encloses with the plane-parallel partial measuring surfaces an angle of between 5 and 35 degrees.
2. The cuvette, as claimed in claim 1 , wherein at least one of the measuring surfaces, defining the at least one measuring space, is formed on an optical element, which is inserted into the first or second flat plate.
3. The cuvette, as claimed in claim 2 , wherein said at least two partial measuring surfaces are elevated with respect to the second inner surface, so that the first vertical distance is greater than the second vertical distance and the third vertical distance.
4. The cuvette, as claimed in claim 1 , wherein said at least two partial measuring surfaces are elevated with respect to the second inner surface, so that the first distance is greater than the second vertical distance and the third vertical distance.
5. The cuvette, as claimed in claim 1 , wherein said second measuring surface of a respective measuring space is circular; and said partial measuring surfaces constitute sectors of a circle.
6. The cuvette, as claimed in claim 1 , wherein said second measuring surface of a respective measuring space is rectangular; and said partial measuring surfaces constitute rectangles.
7. The cuvette, as claimed in claim 1 , wherein said setting surface has a reflective coating.
8. The cuvette, as claimed in claim 1 , wherein at least one of the two measuring surfaces of the at least one measuring space is enclosed by a groove.