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calabash digger
the low conductive targets are hard to me gonna keep at for awhile and see what happens.
If you are finding low conductive targets difficult to identify when using full tones, it may be worth using a discrimination of 5 and digging every repeatable signal, even if you think it sounds to low. Theoretically using disc at 5 you should eliminate most small to medium sized Iron, which normally run the low tone.
Good luck please keep us posted