The diploma is about the design and manufacture of hydraulic scales for the determining of the center of mass for cars. With analysis of the market and evaluation od possible solutions, the optimal solutions were chosen, which were used for the design and manufacture of the scales. A prototype of one part of the system was manufactured, which was calibrated and tested on a practical application. The information gathered was used to manufacture the entire system, which was used for the determining of the center of mass for the vehicle. Mesurement uncertainty of the hydraulic scale is 5 kg.