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In the attached article, the max. and min. voltages shown on those DMMs are 10.21 and 9.85. That's a difference of 0.36 v., ()
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But is that realistic? I've worked in RF labs all my working life. I see lots of DMMs and lots of test gear and it's rare to see a DMM that gives a duff reading like that. Even the cheapy (and poorly built) DMM built into my various old Thurlby PSUs stays an order of magnitude better than the DMMs shown in that link.
A meter that is giving a reading that far out probably can't be trusted if you were to simply 'correct' it against a voltage reference. I'd question the linearity of the metering and I'd even question how someone could have three out of five DMMs that were that far apart. But they don't look to be decent quality meters anyway.
However, I think the point I'm really trying to make is to advise people not to wander into the ivory tower world of the volt nut.