This work presents the analysis and study of the technology used by the instrumented pig called Feeler Pig, used for detection and measurement of loss of wall thickness in pipelines due to internal corrosion. Those study´s objective are the evaluation of dynamic measurement of Feeler Pig´s sensors, through the application of experimental vibration tests, geometric evaluation`s tests and finite elements analysis, so that are showed the results rewarded by this new micro geometric measurement technique. Submarine pipelines (offshore pipelines) inspection traditionally employs the same technologies used for onshore pipelines and one of such technologies is the instrumented pig. However, it is very common to find offshore pipelines with many kinds of obstacles that may prevent the use of conventional instrumented pigs, like MFL (Magnetic Flux Leakage) pigs and ultrasonic ones. The relevant factors that make the inspection difficult, particularly in offshore pipelines, are the different diameters along the pipeline, small radius bends, equipments installed in the pipeline (such as manifolds and valves), increased wall thickness, multi-phase fluids, etc. Currently available techniques in the market to inspect these pipelines are ultrasonic and magnetic pigs, which, nevertheless, have their own limitations. Focusing on this context, a new tool was developed to detect and measure the loss of wall thickness in pipelines due to internal corrosion. This tool, called Feeler Pig, was designed to be able to overcome some of the limitations of conventional inspection pigs. The results achieved by instrumentation of the feeler type sensor`s body, experimental analysis tests, proved that vibration modes of the sensor interferes in the measurement of micro geometric. The possibility of detection, mitigation and / or elimination of the deficiencies of sensor`s issues are viable and addressed in this work. These, coupled with the excellent results of Feeler Pigs field inspections prove the technical feasibility and success in using this technology.