how to do mpi inspection?
['Introduction to Visible Magnetic Particle Inspection. [00:03]', 'Check that that part is ferrous, then clean the part. [00:43]', 'Position the yoke or prods on the part or test area. [00:59]', 'Switch on the magenetizing current. Apply the magnetic particles Switch off the current. [01:39]', 'Demagnetize the part or test area. [02:04]']