>>512697275
>i can dig a hole at the range a metal detector has
The point I made with that is that you can find out what's below your feet that is buried with other material. I can't believe I'm having to explain such a simple concept.

>i just want clarification for what's the range of the instruments that you posted
Here.
https://en.wikipedia.org/wiki/Earth%27s_inner_core

As you can see, it says exactly the same thing I posted in a reply to you.