This technical paper shows the proof from the inspection results of internal surface degradation or defects of ferromagnetic steel pipe sample by Metal Magnetic Memory (MMM) technology. The inspection result using the technology validated by the sample itself which proven for the type of defects and location. In this case, the defect validated is a known corrosion at internal surface of steel pipe sample. The output (magnetogram) of the inspection result shows that the scanning results from Metal Magnetic Memory (MMM) technology on the known degradation sample of corrosion and pitting have distinctively shown distinctive signature of magnetogram when compared with defect-free material. MMM’s magnetogram of Self Magnetic Leakage Field (SMLF) on known defect material shown a burst signal at the screening location, giving indication of its capability or prove of successful detection defects on ferro-magnetic materials’ internal surface, This proof test results indicate that MMM technology can provide information for monitoring and detecting degradation of ferromagnetic materials, defects screening to monitor internal pipe corrosion and cracks detection by only refer to the signal output magnetogram of Self-Magnetic Leakage Field (SMLF). Metal Magnetic Memory (MMM) technology system is based on the concept of self-magnetic leakage field (SMLF) measurement at the surface. The technology is passive, non-intrusive of advanced NDT and it does not require any induced energy applied to the system to detect material defects or material degradation. Its application for detecting material defects or degradation of material-corrosion is very robust, fast, no need for prior cleaning or preparation process. In addition, the inspection or screening can apply to insulation coating pipe and economical where its inspection can cover wide inspection area with arrangement number of sensors. MMM technology has now gained attention as condition monitoring and tools for periodic inspection schedule, and base-line data not required.