I hear when theres 70% brown Tricomes? then they are done..
You are talking about the white hairs that will turn brown during maturity.
Are the White Hairs what i am looking to turn brown?
This is one way, not the most accurate. Get a Mini Microscope at Radio Shack...$11...Priceless!
Are the white hairs the same as the tricomes?
No. Trichomes are the crystals people speak about that cover frosty weed (check my signature). These "trikes" change as the bud matures. They begin clear, then turn milky/cloudy and finally amber. While they are clear, it is too early to harvest. Once they become milky, the bud will produce an up buzz. Once they are amber, the bud will produce a "couch lock" buzz. Harvest when you have 50/50 milky/amber trikes. Look through the mini scope and be amazed. I have seen a plant covered with red hairs and all the trikes were still clear. Pull this plant and miss out on its full potential.
I don't need a pocket microscope for that right? or is there something else that I'm looking for?
Yes, get the Mini. 