Re: Nuking media
You're looking for smartmontools, found at the imaginatively named smartmontools.org ... yes, they do SSDs, check their database to see if your device is supported. It probably is, I've never run across one that isn't.
As a side-note, I haven't bought used media (unless already installed in a complete, running system, or to restore a dinosaur) since the days of floppy based systems. Try to remember, the prior owner sold it along for some reason ... are you sure you want to take on his/her problems? That's not a bet I'm willing to take; these machines are tools, not toys, and new is cheaper than my time is.