Feature 1Acrylic Material: The parallel ruler is crafted from a high hardness acrylic plate for exceptional durability, ensuring it won't easily break or crack over extended use, thus offering a long use life. 2Marine Plotting Tool: Provides a convenient way to accurately mark distances; it's fully adjustable and easy to use for fast, precise one handed operating, a great tool to supplement your navigation kit. 3Clear Scale: Its engraved scale is precise and easily visible, making it an invaluable accessory for accurate plotting and surveying during navigation at sea. 4High Transparency: Featuring excellent transparency, the navigation parallel scale does not obscure too much information, allowing for clear visibility and effective use. 5Easy to Draw: Hold a ruler in each hand and move it alternately in parallel. Sturdy links provide the right tension for drawing a line parallel to another line or reference point.Item Type: Parallel RulerMaterial: AcrylicMaximum Measuring Distance: Approx. 450mm / 17.72inUsage: Suitable for ships, yachts, boats mapping tools, providing a convenient way to accurately mark distances Package List1 xMarineParallelRuler