Magnetic densities or magnetic conditions or points where magnetic fields or other fields press against each other or combine and transform and reflect can form various types of magnetic fields or electromagnetic fields with negative electric charge or positive electric charge. that these fields will have a quasi reflection of the main target field in the surrounding area and become the cause of error in the detection of detectors, and these field changes can create a quasi target situation for any type of magnetic detector or shaping frequency used in a magnetic detector or metal detector Magnetic such as pulse metal detector or VLF metal detector or TR metal detector… or magnetic detector or function generator or magnetic wave system, the conditions for detecting these dense magnetic fields or other error causing fields that are quasi target fields The main one is not there and this is the form of combination detection in magnetism