Hi Moriador,
you can

Be sure to tune every string from "low to high" (low tension to higher tension).
If you reduce the string tension with a capo (tune down), some strings can stuck on the capo and slide down later (out of tune).
That´s why it´s the easiest way to tune the guitar first, then put the capo on and do the fine tuning (from low to high).
Next problem Vasja descriped:
Many cheap tuners show only the "basic" notes E, A, D, G and B.
That´s why some people need the little "trick" from my last post to tune to F and Bb.
I have some problems to express myself properly in English.
I hope you understand what I mean.
