A high-resolution product shot of the STAEDTLER Mars Professional 12-inch adjustable triangle (MPN: 964-51-12-NA) on a pure white background.
A male hand holds the 12-inch wide STAEDTLER 964-51-12-NA triangle, showing its scale.
An extreme close-up view of the STAEDTLER Mars adjustable triangle, detailing the knurled metal adjustment screw and precision protractor arc on a textured, white drawing surface.
A photo of the Staedtler Mars Professional Adjustable Triangle 964-51-12-NA on a wooden drafting desk with a technical drawing, pencil, and eraser, in a professional workspace.
A matrix displaying four clear acrylic STAEDTLER Mars adjustable triangles from diverse angles, highlighting features like protractor scales and metal adjustment screws.
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Packaging and shipping process ensures the STAEDTLER adjustable triangle arrives safely and securely.
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Staedtler Mars 12-Inch Adjustable Triangle - Professional Precision Angle Scale

$67.25
  • Free Shipping Over $50

  • 100% Satisfaction Guarantee

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A high-resolution product shot of the STAEDTLER Mars Professional 12-inch adjustable triangle (MPN: 964-51-12-NA) on a pure white background.

Staedtler Mars 12-Inch Adjustable Triangle - Professional Precision Angle Scale

$67.25
Product description

Master Every Angle with Professional Ease

Achieve absolute drafting precision without the clutter of multiple tools. This professional-grade 12-inch adjustable triangle allows you to set, lock, and transfer angles instantly, turning complex architectural and engineering tasks into a streamlined, creative process.

Why the Mars 964 Matters for Your Projects

Whether you are designing structural schematics or teaching advanced geometry, you need a tool that stays true. The heavy-duty blue acrylic construction ensures a flat, reliable edge that resists breakage, while the aluminum thumb screw locks your specific angle in place for repetitive, error-free design work.

Two-in-One Calculation
The integrated protractor features an inner arc for degree measurement and an outer arc for architectural rise/run slope calculations.
Smudge-Free Inking
Beveled edges are specifically engineered for use with technical pens and markers, preventing messy ink bleed and smears on your final design.
Reduced Eye Strain
The transparent blue tint provides high contrast against white paper, making it easier to see your work underneath during long professional drafting sessions.
Secure Locking
The aluminum thumb screw provides a firm grip, ensuring your set angle won't slip mid-stroke, maintaining consistency across every page.

Technical Fit & Versatility

  • Adjustment Range0° to 90° Degrees
  • MaterialHigh-Grade Transparent Acrylic
  • Locking TypeAluminum Thumb Screw
  • Scale SystemDegrees & Rise/Run

Reliable Canadian Fulfillment
Fast, duty-free shipping across Canada from our local warehouses for a worry-free shopping experience.

Shipping & Return

Free shipping over $50.00 🚚

We want you to be 100% satisfied with your purchase.

Items can be returned or exchanged within 30 days of delivery.

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