It is quite possible to make a simple metal detector by yourself. You will only need a cheap smartphone and an old compact disc.
The stripped wires from the headphones are divided into two parts. One will go to the reflective part of the disc, the other to the power supply element. The disc itself is wrapped in copper wire.
The headphone jack is plugged into the smartphone. The disc with the power element will serve as a signal receiver.
Other questions
Can a metal detector detect 24k gold?
How to make a homemade metal detector with a magnet?
What is a 2 box metal detector used for?
How small of metal can a metal detector detect?
All that is left is to secure the smartphone to a convenient handle, and you can try yourself as a seeker. Such a homemade device won't penetrate deeply, but it will definitely notice something on the surface.
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