I was lucky enough to have been assisted with a member of this forum who helped me to tune using a very cheap tuner, see attached. You can get it at Musicians Friend.
I agree. If you don't have equal tension to start with you are lost. I find that the old method of tapping the eraser end of a pencil near each lug while listening for the same pitch still works best to equalize tension. When I first used my Drum Dial I can remember that all my tensions that I had set with a pencil were almost equal when I placed the Dial near the lugs.But what's the story with this drumtech tensioner? To me, it looks like it suffers from the same problem that regular tuning does in that it's hard to get all the lugs in tune with one another. If that's not done in the first place, then I bet it's no good. Probably the only advantage is being able to tune a whole head at once once it's in tune with itself.