Boat & yacht surveying & ultrasound (UTM) the steel on a boat or yacht.

www.yachtgrot.c...
Ultrasound testing is just one technique for assessing the health of a steel or aluminium hull. Most surveyors these days should be equipped, as I am, with multi echo ultrasound equipment. This is capable of reading through paint systems and reasonable amounts of filler, and usually avoids the necessity of grinding off expensive coatings.