The load tests have the primary objective to compare the experimental arrows obtained during the testing phase and the theoretical arrows of the project, in order to evaluate the deformation profile of the element tested. The test loads used can be distributed (bricks, blocks or cement bags, water tanks) or similar concentrates (hydraulic jacks). The tests that use similar concentrated loads can be of pull or push test type. the result of the load tests and elastic behaviour of the structure is represented through load/shift graphs and hysteresis curves. The measurement of the shifts and deformations can be taken with manual systems, such as mechanical comparators or deflectometers or with automatic-electric systems, such as movement transducers (resistive, inductive, potenziometric). The use of these electric systems allows continuous, stable and precise readings that can be transmitted also far away from the relative testing area. Rapidity of execution, accuracy and safety make this system the most diffused one nowadays, in the test and trial sector.