I think the thing to keep in mind about strobe tuners is that when they are moving really slowly, you are very close to absolutely in-tune. It would be nice to be have an audible demonstration of that. I think I know how you can do that if you have an iPhone, or if you have some type of audio signal generator. I have an app called Beeping App - Tone Generator. You can get that to play a pretty specific frequency, to many decimals. Try A=220 and tune your 5th string. You may have to calibrate either the tuner or the adjust the frequency to match the Peterson. Then listen for the beating of the guitar’s string versus the tone generator, If you look at the Peterson, one of the octaves will be moving in sync with the beating, from black to white and then black for one wave cycle. That will give you a really good sense of how in-tune you are.