Features: Engineered with high accuracy light markings and permanent aluminum alloy construction, this adjustable protractor ±0.1° accuracy for corner measurement and layout tasks. The T shaped metric scale combines a 180° protractor with a 300mm ruler, featuring resistant anodized surfaces and rounded edges for scratch resistant durability and user security. Ideal for STEM educators, woodworking enthusiasts, and mechanical engineers requiring corner calculation in workshops, classrooms, or construction. Perfect for cabinet installation, engineering, and geometry demonstrations where compact portability meets industrial strength measurement capabilities. Its function design serves as both an corner finder and ruler, with numbered gradations in metric units for seamless between drafting and practical applications. Specifications: Substance: Aluminum alloy. Size: 175x92mm. Weight: 60g. Color: Red. Application scenarios: [Engineering and Building] Accurately measure of and roofs to construction . [Woodworking]Help determine the precise connection corner when making furniture and other wood products. [Machining]It is used to position and correct machine parts to improve machining accuracy. [Education] Help learn geometric knowledge and corner concepts in class. Package Includes: High accuracy 0-180 measure angler note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.