Shrinkage cracks in concrete often start to form in the first few hours after concreting. These shrinkage cracks accelerate both carbonation and direct corrosion of the reinforcing steel. By adding fibers to the concrete matrix, it is possible to reduce the early shrinkage cracks. However, the effect of the fibers on the characteristics, as well as the number of cracks depends on many fiber-specific factors, which make a quantifiable prediction almost impossible. By adjusting the environmental conditions in the laboratory to achieve a very high evaporation rate, it is possible to generate shrinkage cracks and thus obtain a comparison between fiber-reinforced and non-reinforced concrete profiles. Suitable geometric and physical parameters for conducting a shrinkage test in a wind tunnel were defined more than 40 years ago. At the University of Applied Sciences (THM) in Germany, this process is being further developed to achieve even better reproducibility. During the optimization process, special additively manufactured guide wheels were designed to enable the most laminar air flow possible over the concrete slab under investigation. This is accompanied by the best possible reproducible environmental conditions, which make the test feasible worldwide and thus establish comparability. Several test executions with different concrete mixes and fibers demonstrate the functionality of the test setup. Basalt fibers were also investigated for the first time in a direct comparison with polypropylene fibers.