Concentric coils,

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Concentric coils,

Post by Bargeman » Wed Apr 05, 2017 10:12 pm

How many of you use a concentric coil, and under what circumstances?

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Re: Concentric coils,

Post by Koala » Wed Apr 05, 2017 10:27 pm


Pinpoint better so less damage by digging smaller holes

Discriminate better around iron.

Slightly deeper for given size.

Don't believe the advertising by a major manufactory of DD coils that show the detecting zone as a coke. It is false and widely reproduced on the internet without checking.

Some coke filled fields the DD is better. Suspect water logged ground also but never checked

The differences are very small. For example coin below two nails sweep along the nails and the DD wins. Sweep across the nails and the concentric wins.

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