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the device was designed for metal materials. It was tested with other materials and although it works, the precision of the measurement is not satisfactory for me to sign under it as a manufacturer. It works quite well with wood, but a change in structure (a knot in a board) can significantly change the capacitance.

so the answer is: No, the device is designed only for metals.

But I have tried both adding gpio to user and not adding. (They were with fresh image install)
I hav read all that link before writing here but nothing changed.
I am using hal and ini files from another working rpi5. Their user names, file names and locations are same.
If i added hal_gpio to hal file, it gives an error about permission.
I added gpio to user, not worked.
I have created 90-gpio-access file as it described, not worked....
The only thing that I havent tried is SPI... I will try it and write here...