What an absolute load of rubbish, may I ask by what...

What an absolute load of rubbish, may I ask by what qualification do you hold to make these statements. I would rather accept the published results put out by Dennis Roach who over many years ran these sensors through rigorous testing, PM200 included. He is highly regarded in the aviation industry, are you. Eddy currents can’t detect a closed crack, give us a break do you actually know what a eddy current is and what’s occurring when you apply it. Pipes will pinch laughable.
Need to certify the instrument for use rubbish, was in the industry for years qualified avionics and we used measuring instruments all the time. Certified no, you simply picked a reputable brand and used that. Sure Roach would have satisfied himself the PM200 was up to it.