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The follow-up scheme for the lift-off-tolerant MFL probing system. 1: probe; 2: wheel; 3: support; 4: slide; 5: guide rail; 6: pressure string; 7: pipe end. (a) the wheel rolling up the pipe end from Position (1) to Position (2); (b) the wheel rolling down the pipe end from Position (3) to Position (4).
