Just be sure to take two readings a few days apart. If they're the same, it's done, but it's ALWAYS best to leave it in primary for a week or two longer than that to let the yeast clean up after themselves and metabolize some of the byproducts of the more agressive fermentation stages. Makes for tastier beer. I think you'll find that waiting almost always improves beer at every step after pitching the yeast.
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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