I'm getting disillusioned with TID machines, so I thought I would ask. What is the realistic Target Identification depth (readout, not just sound) you can expect to get with something like an Explorer or even an Etrac (since they seem to be the preferred VLF depth monsters)? Now, I know conditions play a huge part in this, so I'll set some to work with. We know most good finds are not isolated by themselves, just waiting to be found. So, say the conditions are good ground, some amount of iron within a couple inches of the target but not touching or over it, target canted a little but not on edge, and moist ground. With those conditions how deep could I expect something like the Explorer to give me a good idea, via the display, that something worth digging is mixed in?