Certification in concrete NDT is a 3-month duration certification course. It is frequently important to test solid structures after the solid has solidified to decide if the structure is appropriate for its planned use. In a perfect world such testing ought to be managed without harming the solid. The tests accessible for testing solid go from the totally non-ruinous, where there is no harm to the solid, through those where the solid surface is somewhat harmed, to mostly dangerous tests, for