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+ - Recomendations about very cheap PC based oscilloscope

fffdddooo writes: I know it is something that people use to ask every few years, but answers get old so quickly........
I'm electronics teacher and I'm wondering if it's possible to find some oscilloscope (and why not spectrum analyser) for recommending my students to be able to work at home.
I'm thinking on something near $50-$70. The question is may be something that is not crap for these price?
Two or three years ago I'm sure the answer was no, but nowadays?
I've seen to cheap

http://www.amazon.com/VELLEMAN...
It is 200Khz oscilloscope and 75Khz spectrum analyzer... very cheap but in Khz

But
http://www.amazon.com/Hantek-D...

It aims to be capable of 20Mhz, 2 channel.

What do you think?

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