Visual inspection is dependent on the human operator. I decided to skip it for others that utilize more than a human operator. But now that you have mentioned it, i will discuss it with the others listed in the sequel.
Thanks @adetola.
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Yes it is dependent.. I would be writing on a ndt technique. Very soon it would be released on my blog. Its about an advancement on the current technique using a special sensor to overcome the subsurface limitation. Stay tuned to my blog for it.