Just lifted this on another site.
Teknetics T2 Vs Omega 8000 are very close, in some ways, yet a bit different in others. Here are some basic differences:
Operating Frequency: T2 is 13 kHz and the Omega 8000 is 7.8 kHz.
Battery System: T2 is 4-AA alkaline batteries and the Omega 8000 uses 1-9V alkaline battery.
Ground Balance Differences: Both the T2 and Omega 8000 feature the quick "auto-balance" with the T2 trigger-activated called Fast Grab and the Omega 8000 touch-pad activated method called Ground Grab. Different name, but the same function.
The main difference for me comes when I want to make a manual Ground Cancel adjustment as theT2 requires switching to the All Metal mode and then menuing to the GC adjustment which the Omega 8000 can be manually adjusted in either the All Metal auto-tune mode or in the motion Discriminate mode.
An additional 'difference' is that when making a manual CG change, there are 5 'steps" between one whole number and the next with the T2 while there are 10 "steps" between whole numbers with the Omega 8000. In some applications this will provide a little more "fine tuning" with the Omega 8000.
Numeric VDI read-Out: Both the T2 and Omega 8000 provide excellent VDI numeric read-out.
Graphic TID Read-Out: The T2 has adequate Target ID for most "Coin hunters" and will give a pretty decent lock-on with mainly shallower coins, while the Omega 8000 seems to provide a much better coin-based and common trash Target ID with their segments. Probably a little better for most "Coin hunting" applications IF you're quite dependant on visual TID.
Search Coil Options: As we know, quite a few hobbyists seem to really like the 11" BiAxial DD coil which is standard on the T2, and many have found it to appeal to them on the Omega 8000 as well. However, while I personally like it for certain applications, such as where I favor a T2 and on occasion grabbing an Omega 8000 with the 11" mounted, the Omega 8000, like the T2 can also use an excellent 5" DD coil for very trashy and/or confined spaces. Still, the Omega 8000 has two coils not available for the T2, to include the very nice 10" concentric wound elliptical coil that is 'standard, as well as the 8" round concentric coil that comes on the Alpha, Delta and Gamma models.
Weight & Balance: I like both the T2 and Omega 8000 more than most any other detector on the market, but I find the Omega 8000 to be slightly lighter and a little better balanced of the two models.
Discriminating Differences; The two models have somewhat different rejection levels for the same sample targets, but that's fine as we learn each model. One "feature" or "function" that does attract some day-to-day coin hunters is the ability for the Omega 8000 to employ "Notch Discrimination." That feature is not found on the T2.
Certainly there are other small differences, but these are basically the ones that seem to strike me as more 'different' from one model to the other.
I own both models. I like both models. I favor the Omega 8000 most of all, however, due to the weight, maneuverability, and the 3-coil options, combined with the types of hunting I do the most, I tend to grab my Omega 8000 most of the time, usually with either the stock 10" concentric or 5" DD coil. Site environment makes the choice difference.