Even if you see a curve on a fence, you need a better square. Those kind are for construction type work and are notorious for not being perfectly square.
I have some from Woodpecker, Incra and iGaging.
Starrett has a great reputation for adjustable squares but they're not cheap
In the end, it's worth the money because if you take care of them, you'll be using them for a long time and will greatly improve your cuts and your assembly.
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