eBay

Precision and Accuracy: 12" Triangular Architect's ruler features 3 sides with 6 different scales, You will calculate dimension and perspective for plans and other blueprints without struggling with the guesswork.
Mterial: Made from high grade anodized aluminum, reliable and skillfully crafted for your most project needs, it’s a workhorse on the drafting table.
Laser Etched: Architect ruler for laser etched, They will not wipe or scratch off ever.
Widely Application: Good for technical artist, architect, engineer, plan drawer, hobbyist, modeller, draughtsman, graphic designer, student.
Purchase with Confidence: If you're not fully satisfied, please return it for a full refund.

Constructed of Solid High-Grade Aluminum to reduce flex and warping. This allows the ruler to lay flat on the drawing surface for precise and accurate placement. The concave design feature helps reduce smearing for clean pencil lines.
Specification:
Color: Color-Coded
Scale:1-1/2", 1, 3/4", 3/8", 3/16", 3/32", 1/2", 1/4", 1/8", 3, 16
Package Included:
1 Pack