16ths-inch increments, centimeters, architect's scale, and tenths-inch graduations, plus dedicated 8ths and tenths graph sections for quick proportion checks. The translucency matters more than you'd expect, you maintain visual contact with your work beneath, aligning measurements without lifting and repositioning. Laminated construction protects calibration marks from wear while resisting the warping that plagues unprotected rulers exposed to studio humidity. Technical illustrators appreciate having architect's scale integrated rather than requiring separate tools, while the dual imperial-metric system eliminates conversion delays. Two size options let you match the ruler to your typical drawing scale, whether working on detailed components or full-sheet layouts. Westcott's calibration accuracy holds through years of studio use, maintaining the measurement consistency that professional drafting requires.