On the Detectorpro, the sensitivity is adjustable, it can be set to be from less then an inch to 4-6 inch max. The signal is off the bottom 3rd of the probe, it is not detecting in a circle. When I locate a target, I switch to the probe, hold probe perpendicular to the ground and run probe across cround, its signal tells me when I am directly over the target, I then use a probe to identify the depth, then cut a slit in sod and use my EX-Dig-R to recover it.
I rarely dig more then a 1-2 inch wide hole depending on the depth of the target. On 90 % of the times when I am finished you can not see where I was digging at all, there are no dirt mounds, since I cut a slit, not a plug, grass just pinches back together, there is never any dead grass from a plugs later on, and it takes very little time to recover target.
I am very honest when I say my holes are rarely if ever wider then 1.5-2 inches in city, or county parks. Now if I am hunting an area where hole doesn't matter like in fields, woods, beaches, or old homes sites that have recently been cleared or marked for demo, then I dont worry about the holes as much.
The combination of the DP Uniprobe and the EZ-Dig-R is amazing......... I have had park employees stand and watch me recover coins, with me just waiting for them to tell me I can't dig there, then when I am finish they look where I was digging, see no sign of a hole and turn and walk away.