A three-dimensional microscope with a sensitivity of 2.5 μG/Hz{sup}(1/2) has been developed on the basis of two Hall probes. The magnetic field dynamic range of the microscope at a frequency of 19 Hz is 2.5μG-80 kG. The maximum observed area of the objects under study is 7.5 × 7.5 mm{sup}2 with a resolution of 50 × 50 μm{sup}2. The minimum scanning step along the X and Y axes is 5μm. The maximum displacement along the Z axis is 25 mm with a minimum scanning step of 1μm. An arbitrarily shaped instrument function can be created in the magnetic complex by combining the temperature, the stationary and alternating magnetic fields, and the transport current. The microscope was used for the spatial and temporal visualization of the structure and properties of the critical state, as well as for diagnosing superconductors at temperatures of 4.2-300 K in magnetic fields of 0-80 kG.
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