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Title: Useless
Review: I haven't been able to use it once since I got it. Unless the proportions you are trying to figure out are exactly whats on the wheel, it's useless. Plus...it's not all that intuitively easy to use. Obviously I'm not a "math" person or I wouldn't have tried this device, but I can do better with pencil and paper and a calculator. I think I wasted my money.
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