This machine takes some getting used to. I bought it because I was considering being a piano tuner as a profession. Tried to learn the "old school" method by ear...no success. This machine was recommended, so I bought it. Very expensive. Strobe patterns are hard to read at times...especially when you get up in the high treble section of the piano. When I get that far up, I have to just rely on my ear alone. Gets a little frustrating at that point. If you purchase this machine, give yourself a lot of time and practice getting used to it and using it before you attempt to go out and tune pianos for the public.