While the Nano is really cute, figure it can only really show
stuff up to about 100Khz. Yes, I know Nyquist says 2X
sampling, or 500Khz, but that only applies if you are looking
at sine waves.
Not a sine wave? Then you have higher order harmonics that
will blow past the sample rate. As a kid I built a 5Mhz Heathkit
oscilloscope and didn't understand at the time that it wouldn't
show a 5Mhz square wave very well. In fact, it came out looking
like a mangled sinewave, because the poor frequency response
above 5Mhz was acting like a low pass filter, removing the higher
order odd harmonics.
In short, I'd say the Nano is useful for audio stuff, but not much else.
My Rigol DS1052E is good up to 50Mhz, but is sampled at 1Ghz, a 20x
difference!
Scott