As an NDT assistant, you help perform nondestructive testing on a property, usually before the owner sells it to someone else. In this role, you may inspect the quality of each material used in its construction, use various techniques to conduct an analysis of hard-to-reach areas, and otherwise help the primary tester conduct their business. NDT assistants often work on larger properties like apartment complexes that can be hard for a single inspector to evaluate, and rarely work without an on-site supervisor. Depending on the needs of each inspection, you may work as part of a team of assistants rather than being the sole assistant.