In the Mechanical Measurement laboratory of the University of Cagliari, together with other universities, they are studying some results relating to the use of E.R. strain gauges photo-etched to Davies’ bars. The use of such sensors in a partially bonded version is framed and presented in this study. The aim of this work is to verify the applicability of the partialization by means of experimental determinations, both in a static and dynamic condition. The Results drawn in a dynamic condition prove that the length of time of a free dynamic evolution of unbounded strain gauges is rather long, in the order of the ms and nearly unrelated to the dimension under stress.