Hello everyone, I am a treasure hunter from the Loess Plateau in northern China. I am very happy to come here to meet you. With my current simple experience, I cannot determine the use of a machine suitable for our local soil. I would like to ask all the experts to consult. The pure loess plateau here is less mineralized, the soil layer is pure, and there are very few rocks. I am currently optimistic about the machines, Whites Spectra v3i, AKA SiGNUM MFD, mostly Xp35 and Minelab. I want to buy a deep A good machine is mainly looking for silver coins and copper coins. I hope you can give excellent suggestions. In addition, I want to know if the depth of the Whites TDI SL pulse machine can exceed V3I and Aka. Please give excellent suggestions from friends who have used it. I will be grateful for this, thank you all!