Hi Jan,
If there is not much small magnetic garbage sitting on the ground or at shallow depth, the height of the sensor over ground is not too important.
All the modules of the PPM-MarkII are designed and built to contain a minimum of magnetic material. The only part which we could not remove is the skeleton of the LCD which is a small sheet of steel. Every other parts are either stainless or aluminum or plastic or brass. The battery is lead-based thus, non-magnetic.
It means that the electronic box (NEMA box) should be kept at at least one meter out of the sensor coils but no other precautions should be taken.
Willy
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