Centering tools

Does anyone here know if professional graders use any tools for determining quality of centering on cards? I’m definitely aware of very special lighting and magnifiers that are used when they try to look for fingerprints or mark defects but I’ve always been interested to know if there are any tools used when it comes to evaluating card centering.

At PSA, they use a metallic ruler(no joke).

Like protractors or regular rulers?

Just a regular ruler. No need to measure angles here.

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That video where they show the “grading process” is so outdated. They may still use the same tools (metallic rulers); however, it’s tough to actually know for sure whether they do or not. I kinda doubt someone is sitting there measuring every card that gets submitted! LOL

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Yeah you’re right, I don’t think they measure most of the time especially for bulk submissions.

BGS are much more strict on centering. I wonder what they use.

They just eyeball it so estimated would be more accurate.
I have a lock 10 card that is worth multiple thousands sitting in a PSA 9 slab. It was docked for centering ONLY. An accurate measurement placed it well within the PSA 10 parameters. Uon review the centering deduction was upheld.
Makes sense to me???

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You could scan the card on a flatbed scanner, and then bring the file into Photoshop to get exact measurement. Or count the pixels to determine how off center it actually is.

Or a metal millimeter ruler would also do the job.

You mean for my card?