Permits inspecting a hidden or inaccessible area of a pipe or structure from the exposed side. Penetrates up to 3m (10’) from the area of inspection. Ideal for lamp posts, pipes, or any structure where there is only partial access to the structure.
Check this paper to know more about inspection of inaccesible areas:
Inspection of lamp posts and other non-accessible areas with EMAT Medium Range Guided Waves.