If you're running 400 KHz I2C, that units 1M (1000 KHz) samples/sec will not tell you much about the signals - you'd want something that can do 4M (4000 KHs), otherwise you barely see more than a high & low each clock signal.
Oscope below 200MHz is wasting the money, imho..
I really want a small digital unit with much better bandwidth than my current USB DPScope.
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