Movie DVD quality test?

Hey everyone, I’m new here and hopefully this post won’t make it blatantly obvious. This is the situation:

I’ve recently acquired thousands of used movie DVDs that I’ll be reselling in an online store. I’d like to be able to make sure the DVDs are in good condition before I sell them without having to watch them all.

Is there any piece of hardware/software (I run Mas OSX only) I can buy to quickly test the quality of the used DVDs before I put them up for sale? Any ideas?