The elliptical XP coil offers increased sensitivity to small parts and separates iron better from non-ferrous and precious metals due to the narrower detection field and is therefore particularly suitable for heavy iron contamination in the ground.
Compared to the double-D series coil, the detection field is tapered/smaller towards the bottom, so that a better separation of debris is possible. A nice side effect is that this coil increases the sensitivity to small parts. Note: