http://www.seeedstudio.com/depot/micro-digital-storage-oscilloscopedso-nano-p-512.html

To give an idea of the kind of thing I need it for, the first thing I'm going to do with it is monitor the voltage over time at my car battery, as I suspect the alternator is not working as well as it should at idle revs. My simple multimeter won't do, as I have reason to believe the voltage isn't steady, and that's what interests me about it.

The DSO nano looks like it'd do the job, but I'm hesitant to buy one without asking opinions or seeing if anyone knows of any alternatives.

My need is for a relatively simple oscilloscope, ideally with more than one input channel (two would be fine). It's not for logic analysis work, and would need to be portable and battery powered (ideally, more or less hand held). Does anyone have experience with the DSO nano or an alternative device?