Features: High quality acrylic plate, high hardness, long service life. Precise scale, precise scale engraving, convenient to view. Good accessories for drawing and measuring. Goodtransparency: The navigation parallel ruler has goodtransparency and does notobscure too much information. Convenient to grip. Hold ruler in each hand, alternating and moving in parallel. Strong link provide appropriate tension for lines parallel to another line or reference points. Usage scenario and crowd: Used to draw lines, bearinglines or courses, bearingalignment or number. Specifications: Material: Acrylic Length: Approx. 60cm/23.62in Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Parallel Ruler