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Since a magnetic field is inherently invisible, it is useful to develop effective-teaching materials which can make beginning electromagnetics-learners imagine a magnetic field. We have previously developed a method to combine Augmented Reality (AR) technology and real-time simulation to visualize an electromagnetic field, however, this visualization system cannot depict an actual magnetic field. Therefore, we have newly developed a teaching material to measure an actual magnetic field distribution by using many 3-axis magnetic field sensors and we have studied a method to effectively visualize a magnetic field. In this paper, we report a developed hardware configuration and software functions. This developed visualization system utilizes AR technology, and it is possible to observe a measured magnetic field in 3D space.