So, I am in need of something that will help me find my buried well cap.

Basically I want to attach something small to the end of a steel line and then track with the phone through the ground.

I've seen a number of things which seem close but my knowledge and experience is such that I need more help in focusing my efforts.

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    Please explain (in your question) why you think a steel line and a phone make useful components in a well finding expedition. You might also explain what the well cap is made of, it's size and depth. It should be obvious that this is required information. – Transistor Jul 2 '16 at 12:41
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    I've just noticed that you've tagged the question with 'bluetooth' and 'rfid'. How will Bluetooth or RFID help unless there is a Bluetooth or RFID device in your well cap. Is there? – Transistor Jul 2 '16 at 12:48
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    I think maybe he has a pipe leading to the well cap, and he plans to push an RFID tag or similar down the pipe on a steel wire, and follow that above ground with the phone? Either way, the question needs to be clearer. – Jack B Jul 2 '16 at 14:24
  • If this is a product recommendation rather than design question, it is off topic. – user2943160 Jul 2 '16 at 14:50
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    There are devices that will track a buried steel line with a RF signal applied to it - but they are not a phone. Look for documents, which will typically have a distance from two points such as foundation corners (draw an arc from each, X marks the spot), hire a line locator service with the right tools, or dig outside your house where the waterline comes out, and figure it goes in a straight line most of the time for digging the next hole. When you find the well, have the casing extended above ground (buried caps are so last-century.) – Ecnerwal Jul 2 '16 at 15:13

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