Kind of sounds like a tv show.
File this under "stuff found while cleaning out the back room of a card store"
When topps started placing those 3M stickers on the back of autos and game used, they sent dealers this little item to magnify (and verify) the sticker.
Honestly, I never used it because it strictly was a gimmick as there was no need to use it.
But as we all know from the "bowman originals" debacle, the stickers could easily be messed with, thereby providing no true authenticity.