Professional-Grade Angle Measurement Tool

360° Double Scale Protractor with 30cm Diameter Ruler  

Key Features:  
- Full 360° Measurement Range  
  Accurately measure and construct angles in any direction (0-360°) with dual inner/outer degree scales for versatile math, engineering, and design applications.  

- Integrated 30cm Transparent Ruler  
  Combines a large-diameter protractor with a precision-calibrated ruler on a single shatterproof acrylic sheet, enabling simultaneous angle plotting and length measurement.  

- Ultra-Durable Construction  
  Crafted from 3mm thick optical-grade plastic for scratch resistance and long-term clarity. Withstands frequent classroom or workshop use without warping.  

- Enhanced Usability  
  - Non-Slip Grip Edges: Textured borders ensure stability during drafting.  
  - Laser-Etched Markings: High-contrast black/red scales resist fading.  
  - Radians Conversion Guide: Secondary scale for STEM/trigonometry calculations.  

Technical Specifications:  
- Material: BPA-free transparent polycarbonate  
- Dimensions: 30cm diameter circle + 30cm ruler extension  
- Scales: Dual-degree increments (1° precision) + centimeter/millimeter ruler  
- Compatibility: Works with dry-erase markers for temporary annotations  

Ideal For:  
- Geometry classes & university-level technical drawing  
- Architecture blueprints & mechanical engineering diagrams  
- DIY projects, quilting, and woodworking angle layouts  

Package Includes:  
1× 360° Protractor-Ruler Combo  
1× Quick-Start Guide (with angle calculation examples)  
1× Protective PVC sleeve for storage  

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This all-in-one tool eliminates instrument switching, offering unmatched efficiency for precise angle measurement and straight-edge tasks. ASTM International compliance ensures measurement reliability for academic and professional use.

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