
I'll admit, I was a bit concerned at first. I laid my straight edge across the surface and could see light shining through underneath. However, I used my smallest feeler gauge (0.015" / 0.04mm) and couldn't slide it under the straight edge anywhere.Is it flat within .0025mm as they claim? Probably not. It's definitely better than 0.04mm though and that's perfect for my needs.

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