I've never owned a proper strobe tuner, but I've used "TB Strobe Tuner" on my laptop (via USB on a THR 10 amp) and Strobe Tuner 1.4 on my android phone via the microphone. Both of these are pretty old pieces of software now, but are as good as they were 10-15 years ago and there are many forum tales on the internet of people using these programs to get results as good as anything. When I set intonation it is a 1-2 hour process usually. I obsess over getting strobe pattern to match (open string to 12th fret, I gave up on harmonics). I don't have a nut problem. I just setup a guitar like this and thought I had nailed it. I played some open chords in G, recording into a looper, and then did played in the 12-15th fret G pentatonic zone... and it sounds terrible! If you were jamming in a band you'd stop and have to retune. Do I need an expensive Peterson tuner? Or do I just get close with the tuner and then go by ear?