Why an oscilloscopeI hadn't really looked at oscilloscopes for decades, because I really didn't have much use for one. I only recently started doing electronics again, and tend to stick with things centered around microcontrollers and specialized digital modules. A circuit with even as many two analog components is pretty rare for me.
So I was surprised to see a reference to a $20 oscilloscope. Didn't think you could get one for even an order of magnitude more than that. So I investigated them, and found a slew of micro-controller based oscilloscopes ranging in price from that $20 - for a kit - to a little over $100. They typically have one channel, a small display, and a a very low bandwidth limit. But what do you know - I might even have a use for one!