Westcott Combo Scale Ruler, 12-Inch/30cm (M-100) 3 scale ruler Graduations in 16ths, 10ths to the inch & millimeters Inch graduations in sixteenths, tenths to the inch and metric calibrations 3 scale ruler ^Graduations in 16ths, 10ths to the inch & millimeters ^Inch graduations in sixteenths, tenths to the inch and metric calibrations