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Before trolling a bit, I remember the main costs don't come from hardware (though it definitely costs something) - rather for r&d, patents, and most of all proper certification, since, in the end, it's a matter of life and death. That being said, this experiment is mostly a dev kit to help curious tinkerers explore the topic :)

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> in the end, it's a matter of life and death

But also if you can't afford one.

You don't go to jail for not building one.

Am I allowed to built an ultrasonic probe the way I want if I don't use it on anybody else but me ?

I guess nothing prevents you from doing so :)

Yes. Just come up with a non-medical/safety use for it and you are good. Check your car's engine to see if it will last through the next race - a very useful thing to do and nobody will think twice. Check a boiler to be sure it won't explode - you better get this right or people will die so don't talk about potential uses here.

Yes, more and more (since I started reusing old devices), I wished I could inspect things non invasively. To find locking or friction points.

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