I don't think you will get a better determination of a target before digging it than the ID provided by an Explorer. Regardless of whether you are using a DD or concentric coil. By measuring and displaying both the ferrous content and the conductivity simultaneously, you are getting the best of both worlds. But even so, without X-ray vision, we are limited to the detector making an analysis of the condutivity and ferrous content, listening for the abruptness of the tone and displaying the visual information to us. If the metallic content of a coin is the same as a piece of trash, the TID will be the same. You might distinguish trash from treasure by size. But it is possible for the TID to be the same. For example, screw caps come in different metallic compositions. Many of them around here read 07 / 27. Coincidently, that is the same as a US $10 gold coin. Some screw caps read 06 / 27. The same reading as many Memorial cents. But, with that said, the "double analysis" of the Explorer (32 Ferrous posiblities and 32 Conductive possiblities) should give you an edge over the 28 two-digit notch segments of the X-Terra 70. In other words, the X-70 only has 28 "compartments" to categorize a target. Theoretically, the Explorer has 32 Ferrous numbers and 32 Conductive numbers, making for over 1000 combinations in which to "label" the target.
You had mentioned the DeLeon and Cortes in your previous post. I think both models are good detectors. They provide excellent discrimination characteristics and the 120 circuitry is pretty good in iron. However, if you want or need manual Ground Balance, neither model offers it in the Discriminate mode. The Cortes offers manual GB in the all metal mode. But both are factory preset in Discriminate mode.
HH Randy
You had mentioned the DeLeon and Cortes in your previous post. I think both models are good detectors. They provide excellent discrimination characteristics and the 120 circuitry is pretty good in iron. However, if you want or need manual Ground Balance, neither model offers it in the Discriminate mode. The Cortes offers manual GB in the all metal mode. But both are factory preset in Discriminate mode.
HH Randy