KEY FEATURES Dramatically increase the speed and accuracy in detecting invisible delamination, voids and hollows below the surface of concrete, tile and natural stones, compared with tapping with hammers or dragging chains. Use for non-destructive inspections of concrete slabs, parking garages, bridge decks, beams, tile, balconies and tunnels. Changes in the sound of the sprocket teeth tapping the surface reveal the hidden defects. Safer than climbing up and down ladders with a hammer. Helps...