This thing is built absolutely simple and therefore without the instructions for use to use immediately and to understand.
(Acoustic guitars you can vote via the built-in micro / connect electric guitars over a phone cable and vote)
The strings are, as long as they are not totally out of tune, automatically recognized. Now only gradually strike and adjust the strings are the green LED lights - done.
Those who do not get along, or want to see how the part works, can on Youtube for "guitar tune with tuner" Search. The video of "guitar teacher" illustrative handling, in my opinion, the best (even if it here the "predecessor" of the GA-1 shows)
Putting up with a Plektum is (at least with my picks) rather awkward and shaky.
Rather just lay it on the knees - the most practical for me.
Overall, the tuner makes a good, handy and sophisticated look