The article analyzes the influence of the construction stiffness of the measuring device and its effort to the resulting measured results. The article deals with the possibility of increasing the accuracy of measurement and at the same time reducing the measurement deviation on the measuring device by increasing the rigidity of the structure of the device. In the introduction, the article describes the stiffness, errors and analyzes the possibilities of increasing the accuracy of measurement on the measuring device and examines the causes of measurement deviations. In the next part, the article offers the possibilities of increasing the rigidity and strength of the measuring device. In the practical part, the structural modification of the device increasing the overall rigidity and strength of the structure is presented. In the practical part we made a simulation of old device frame and modified frame. In the last part, the article compares the results of measurements before the structural modification and after the structural modification of the increase in stiffness.