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For non-destructive testing of mechanical properties, stress-strain and fatigue states of ferromagnetic materials, are widely used coercimeters with attached transposable magnetic device (MD). In such coercimeters all stages of estimation of the coercive force (c.f.) are performed with stationary MD at the test point during the entire measurement cycle, i.e. for measuring c.f. at another point, the transducer can only be relocated. Disadvantages of such a discrete in time and space method are: limited performance due to the need to maintain the same position of MD during the measurement cycle (about 5-10 s), dependence of the instrument readings on the ratios of items with large surface (plates, sheets, etc.) and small 'work site' of MD; inherent discreteness of distribution of the resulting c.f. over the surface of the item, undoubtedly more complicated automation of c.f. measurement process with such a movable transducer. Proposed technical solutions allow to significantly expand the scope of application of coercimeters with movable MD, especially for diagnostic robots, because they ensure continuous highly efficient measurement of coercive force in the elongated items (pipelines, rails, bridges, tanks, etc.). This simplifies the process of documenting the results of measurements, their lock-on (in the course of movement of the device) to specific parts of the tested item, the construction of the topography of distribution of coercive force values on the surface of the item. In addition, use of permanent magnet as magnetizing component of the device can provide a significant reduction in energy consumption of the kit; it allows designing self-contained power supply coercimeters, which further extends the functionality of the device due to access to sites located far from industrial power supply sources.