The old vacuum tube Tektronix finally gave up the ghost so I'm looking at going with the PC-based version. For around $60 you get a hardware interface, software, probes and USB cable. I wouldn't think about it if it didn't have the hardware interface to protect the computer. Most are AC-in max is 60 volts peak to peak, so that would handle most amps. I could easily apply a voltage divider if needed. 20 mhz. Anyone use these and are they any good? Here's an example of one: http://www.ebay.com/itm/Hantek-6022...-USA-Seller-/291053997898?hash=item43c42b8f4a TIA.