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Lee Valley/Veritas Phi Rules Dual-Scale Ruler for Golden Ratio Measurements
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Lee Valley Phi Rules Dual Scale ruler The Phi Rules dual scale ruler allows you to make simple measurements as well as doing more complex angle measures on the fly.

Phi Rules from Lee Valley/Veritas make it easy to calculate the “Golden Ratio” of 1.618. A dual scale has normal graduations on top and Phi-scale graduations on the bottom. They come in different lengths; prices start at $1.95 for the 6" rule.

posted on February 1, 2008 by Matt Hocking
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