Reinforced soil structures are often used in the practice of transport and industrial construction. The existing methods for calculating such structures have a number of significant drawbacks and do not always allow to accurately determine the design parameters, especially for settlement and tensile stresses in the reinforcing layers. To improve the methods for calculating reinforced soil structures, it is necessary to conduct full-scale experiments to determine their stress-strain state. Field experiments to assess the stress-strain state of reinforced soil structures are a complex technical problem. Most often, in these full-scale experiments, round stamps of various diameters are used. In the course of research, it is necessary to measure normal stresses and vertical displacements in the core of the reinforced soil base and tensile stresses in the reinforcing layers. To improve the accuracy of measurements and reduce the distortions that sensors introduce into the stress-strain state of reinforced soil structures, their careful selection is necessary for a number of parameters. The paper provides recommendations on the selection of pressure sensors for measuring vertical normal stresses in the soil mass. The diameter of the pressure sensors should not exceed 28-80 mm, depending on the diameter of the round die used for testing, and the recommended thickness of the pressure sensors should not exceed 2.8-8.0 mm. After the selection of pressure sensors, it is necessary to determine the measuring strain gauge system. The main criteria for selecting a measuring strain gauge system are the number of active strain gauges in each pressure sensor, the total number of measurement channels, and the electrical resistance of strain gauges. To measure tensile stresses in the reinforcing layers, you can use miniature strain gauge sensors using bridge or half-bridge connection schemes for active strain gauges.