The depth on the T2 6.5 is very very impressive. I dug a small round metal trash object that was a good 7" and when I say small I mean less than a Quarter inch in diameter.. The area is next to a River, and it floods a lot around it. So items do tend to go deep in the muck and soft ground.. I dug a 1983 Quarter at 9". Sens at 60, Tones 3b.. Discrimination mode of course.My standard T2 does not have anywhere close to the power of the 6.5. I also want to mention it is very quiet operational machine too. I just got this one, and it's the first time I used it.. My other 6.5 is close but not as quiet, or deep..Anyone have an explaination why three T2's could be so different in operation........The manual that comes with the 6.5 's are still the manual that came with T2 standards..So if changes were made Tek isn't saying..