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Jon:

I've also mention scopes a simple hand held and? Velleman too... No longer available... $130 many moons ago...

Having used some rather high end Tek scopes this little scope is not much more and a good VOM that has squiggely lines... Useful to look for spikes and that the wave form looks okay.

Sounds like one of those expensive Fluke Scopemeters.? Useful for an electrician, not useful for much more. They are just a little too crude to be useful beyond the MRO field.

You want something that will produce a reasonably accurate trace, unfortunately, the nice people at Tek hold a lot of patents relating to the front end input circuits, and they are not sharing. Considering what an old analog Tek scope goes for used, the low cost Chinese DSOs available now are a steal for $500.

I'm looking at scope hats for Pi and other such gadgets and I don't anything better than my Velleman.

That said it's useful...

Reading through web sites for tech It looks like something north of $400 will get you something that you would dive into something higher up the food chain frequency wise to really see what's going. Unfortunately computers have moved into such high frequencies to work on any thing other than I/O we need lot of $$$.

Off topic a bit the bet scope I found was a Tek Scope/Spectrum anylzer... go out to 35GHz... Can you say $235,000...

I did see one just before Christmas, used, 50% off, ?120,000 IIRC.? Not that I need something like that. I do have a $1200 battery powered crimper at work, 1.6 tons of force.? I just mentioned it would be nice to have, and a few weeks later I have one. Could be very useful for bus wiring...