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 Hall sensors has two phenomena, hall effect and Magnetoresistive effect.  Inductive coil measures FLUX GRADIENT, Hall Sensors directly measures the components of the flux.  Typical application of MFL are by the steel products, where blooms, billets, rods, bars, tubes and ropes are tested  Wire rope, installed tubing or retrieved oil field tubular goods by independent facilities  Steps of magnetic flux leakage testing  1-magnetize the test object so that discontinuities perturb the flux  2-scan the surface of the test object with a magnetic flux sensitive detector  3-process the raw data from these detectors in a manner that best accentuates discontinuity signal  4-present the test results clearly for interpretation. INTRODUCTION  Magnetic flux testing is an electromagnetic technique that can provide a quick assessment of the integrity of ferromagnetic materials.