Durable plastic construction with high transparency for long-lasting use All-in-one measuring tool: professional drawing triangle ruler with a built-in protractor and clear scale numbers for precise readings Versatile geometry and drafting tool: suitable for art design, score measurement, building templates, architecture, network technology, and drawing Precision you can trust: transparent material and accurate scale marks help ensure clean, exact results Use scenarios - Draft architectural layouts and templates: align edges, measure angles with the protractor, transfer measurements accurately - Art design and technical drawing: create precise geometric shapes and scale drawings for projects - Education and schoolwork: geometry homework and class projects in architecture and design This triangle ruler protractor combination is designed to be sturdy, easy to read, and reliable for everyday drafting and measuring tasks.