Material: Made of premium acrylic sheet, high hardness and long service life. Function: Designed to draw bearing lines or course lines, indicating the degree or amount of direction. Precise Scale: The scale is engraved for accuracy and clear visibility. A reliable accessory for drawing and measurement. Good Transparency: The navigation parallel ruler offers good transparency and does not obscure underlying details. Easy to Use: Hold one ruler in each hand and move them alternately in parallel. Sturdy connecting links maintain proper tension for drawing lines parallel to a reference line or point. Material: Acrylic Color: As shown Package Contents: 1 x Parallel Ruler Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3 cm.