ASTM Field Indicator or Pie Gauge – MPI Testing

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Pie Gauge or ASTM Field Indicator. What is Pie Gauge or ASTM Field Indicator ?The pie gauge is a disk of highly permeable material divided into four, six, or eight sections by non-ferromagnetic material. The divisions serve as artificial defects that radiate out in different directions from the center. The diameter of the gauge is […]

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