Metering unit having better measuring properties

The subject of the invention relates to a measuring unit with improved measuring characteristics to facilitate the analysis of samples in various states of matter, especially blood samples, which has a light source (10) suitable for emitting a controlled light beam (11), an accommodation body (20) located in the path of the emitted controlled light beam (11) containing a flow cell (21) for the sample (1) to be measured to flow through, and an optical part-unit (30) located on the output side (23) of the accommodation body (20) opposite the input side (22) of the controlled light beam (11), and the optical part-unit (30) comprises a primary light path influencing optical member (31), a secondary light path influencing optical member (32), and light output measuring bodies (33). The characteristic feature of the invention is that the primary light path-influencing optical member (31) is a collecting lens suitable for producing a converging light beam, the secondary light path-influencing optical members (32) comprise projecting pieces (32a) located in the optical axis (12) of the controlled light beam (11) passing through the accommodation body (20) but separated by a given space (T1, T2) and having a reflecting surface (32b), as well as supporting elements (32c) carrying the individual projecting pieces (32a).