DPI (Dye Penetrant Inspection) Elevated Tensile Hardness Intergranular Corrosion Image Dimension Measuring (Keyence) Micro Etch MPI (Magnetic Particl... DPI (Dye Penetrant Inspection) Elevated Tensile Hardness Intergranular Corrosion Image Dimension Measuring (Keyence) Micro Etch MPI (Magnetic Particl