To me, the presence of the VSC machine was the most revelatory thing about the video. (If you haven't watched the vid, think of putting a card under a black light which clearly and immediately exposes any hidden wrinkles and such.)
I assume PSA has one of those guys, too. That would explain how a couple of the cards I had graded came back 4 or lower, even though they outwardly looked beautiful. They must have 'not easily detected by the human eye' wrinkles in the surface. Kinda frightening to realize why every card you send out to be graded comes back much lower than you expected.
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