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Schematic drawing of the magnetic microrheometer. 1) Light source, 2) Thoroid, 3) Specimen holder, 4) Microscope lens, 5) Set of mirrors, 6) Pair of photocells, 9) Amplifier, 13) Oscilloscope, 14) Microcomputer, 15) Moving steel microsphere. Source: Nakagawa et al., 2000.
