Fast dead pixel detection for LCD testing

I've been reading a lot about how customers are returning their Surface Pro 3's due to dead pixel issues right out of the box. So, that got me thinking, how does one even test for it. This link is what came up in search and it's very simple. I've never bothered to do a test before because I never had issues with my Monitor. Figured I'd post this here if anyone else wanted to test theirs.