The idea of the final work was to show action of force on the joist on the didactic appliance, which has the purpose of an educational apparatus. For this purpose electrical resistance tapes were used which were installed on a measuring element made of aluminum. The measuring element is mounted on the measuring support, and the measuring support on the didactic device. In the paper are the components and tools that were used to obtain the desired measurement. Tests were performed on the several measuring elements, thinner, ticker, as well as on plastic and aluminum. Methods for better response are described, apropos detection of voltage which is measured with electrical resistance tapes, ass well connection of amplifiers with measuring tapes. Towards the end of the work the software tool used to display measurment results was processed. The values of the voltage depends of force function are described, and the ways of the connecting the card for acquisition measurment data to a computer are discussed.