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The Vanquish 440’s smaller sized coil (top) doesn’t penetrate as deeply as being the Simplex BT’s (base), but it might be a bonus in pinpointing a small item’s spot. Photograph: Marki WilliamsAfter that, I did what’s referred to as a seeded hunt. I dug a hole 8 inches deep in my backyard and set in a metal bolt, a short length of copper p