basically both are superior visual testing ie indications are get magnified that can detect by naked eye easily.pt is ment for non porus metals mt is ment for ferrromagnetic(strongly attracted towords magetic field) materials.In mpi we can be used for surface and subsurface but pt is only for surface indications.In mt get result as fast (within min) compared pt(min 30 min.) In mt skill is necessory to perform mt compared to pt. --- |
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