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Thanks-That's one of the ones I'm thinking of.

I just edited to add the actual link that I forgot in the OP-sorry.

And if the Iphone magnifier is useless for edge diagnostics, anybody want to chime in on the other best options currently...

https://www.nytimes.com/2017/05/16/technology/personaltech/use-phone-as-digital-magnifying-glass.html?_r=0

I don't know if anyone has seen this or tried it. I didn't know it, but IOS 10 comes with...