Fons and Porter Diamond Ruler
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<b>[Product Information]</b><br>
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<li>This ruler does the math for you.</li>
<li>Package includes clear ruler with black and yellow markings</li>
<li>Easy to understand directions printed on the ruler</li>
<li>Made in USA</li>
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<img src='http://ecx.images-amazon.com/images/I/41RWZgAMjrL.jpg'></br>