I used the F2 in bad soil and had very little depth, but no detectors got any deeper in that horrible devil dirt.
That same F2 in wonderful mild Kansas soil goes way deeper.
The 4" sniper goes past 6", the 8" past that and the 10" concentric gab get to at least 9 or 10" , the deepest I have dug targets so far.
I can't talk about the F5 because I never swung one, but I did recently pick up an F70.
Definitely deeper than my great little F2 in the short time I have used it.
Using the standard elliptical coil the greater power lets me get to 6-7-8 and 9" more consistently and with very good ID's, I have acquired targets deeper than 10" but couldn't dig them because of frozen soil.
At one park that 10" coil locked onto a 10" deep target and I heard a tone from several directions even though there was no information at all showing up on the screen.
On very deep targets at the end of the scanning field the F70 will act this way...kind of like it won't even take a guess, but that tone was solid and stable all the way.
This was a beaver tail tab every bit of 10" in depth.
In another park at the outskirts where there was wifi and a power line so lots of EMI using the 11" DD coil the F70 found and identified an Indian head coin spill with good tones, pretty solid numbers, accurate ID's and correct depth readings at the 7-9" depth level despite the EMI.
On another hunt at this same old park more in the middle away from a lot of this EMI I used the F75 11" DD coil.
This coil is definitely deeper than the standard coil, I regularly get depth readings on targets consistently at levels more like 6-10" deep and even at 11" and deeper with audio and screen info.
On one target with this coil still in disc but with the settings jacked up to max I came across a signal that was again solid and repeatable in the tone and had numbers that jumped a bit but 25-27 showed up on my screen more than others.
The depth on my screen said 12-14" and I was surprised, but the dirt here was not frozen so I dug it just to see if something was really down there that deep.
At the very bottom of the hole there actually was a target that in air testing came in at a true 25-27 VDI, and I measured this hole and would you believe this target was laying at an actual depth of 14"?
I was floored...and very happy at that moment.
The target was trash, a thumb ringer off an old time bicycle handlebar bell, but I don't care.
The fact that this thing can get this deep with pretty solid audio and decently accurate screen ID information thrills me to no end. Can't wait for the weather to finally clear and for the season to really begin.
I don't think this will be the last surprise the F70 has in store for me.
