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In this paper a new rheometer for Self-Compacting-Concrete (SCC) and High-Slump-Concrete is presented. It is installed in a concrete mixer and provides results of the rheological properties immediately at the end of the mixing process. The intention was to find a way to evaluate the rheological properties automatically in the last step of the mixing process. Therefore, the rheometer immerses in the concrete and starts the measurement. At this time a correction of the mixture is still possible, before it is filled into the truck. In a first step, a laboratory rheometer was built and the measurement procedure was developed. In a second step, the laboratory rheometer was installed in a 75 1 concrete mixer and data were collected and evaluated. The accuracy is proven by comparing test results with a slightly different mix design.