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EL NINO
I believe that better technical capabilities of detectors - better separation, and especially better depth of separation, and with accurate VDI of the target during separation... as well as good identification of the detector for unwanted targets such as iron... enables great detection efficiency... in proportion to the number good goals for iron and other waste..

And exactly as Kac says... I also strongly believe in the possibility of further improving the detection properties of an already technically really good detector... with the help of a suitably large or small CC or DD coil... especially if the terrain is heavily traversed... where there are good targets... and where the use of a standard coil does not bring more finds... and detection practice confirms this...

I strongly rely on this type of detection and properly VDI targets if they are targets with the same or very similar VDI...even very old coins were strongly standardized and the VDI of such targets is strongly similar or the same..

As for the different brands of detectors.. each detector has its own target detection logic.. and its own iron or non-ferrous waste detection logic. I also take this into account in waste detection..