Hi, I've only just started to learn how to play guitar, and obviously am not too hot on tuning up yet! I bought this without even previously having had a tuner in my hand , ever! This little gadget is a god send. You just switch it on pluck the string and it automatically finds the right note. There is a little arm on a pendulum that swings back and forth, you keep tuning until the arm is in the middle and the green light comes on to let you know that you have optimised tuning! so simple! It also does a bunch of other things too, that I haven't explored yet, such as it will tell you if you are playing the right chord! Get one, it really is worth a few quid! Hope this helps!