Feature 1Accurate Marking: The parallel ruler is an essential drawing tool that allows for convenient and accurate distance marking. Made of high hardness and transparent acrylic, ensuring long lifespan. 2Convenient Operating: Suitable for marine vessels drawing tools, the boat parallel ruler provides a convenient way to accurately mark distances up to 600mm. Sturdy, fully adjustable, and easy to use for quick and precise single handed operating. 3High Transparency: The navigation parallel ruler offers excellent transparency without blocking too much information. Allows for drawing parallel lines with ease by moving both rulers parallelly, providing proper tension for accurate drawings. 4Easy to Draw: Simply grip each ruler with one hand and move them parallelly. The sturdy linkage provides appropriate tension for drawing lines parallel to another line or reference point. 5Clear Scale: Its engraved scale is precise and easily visible, making it an invaluable accessory for accurate plotting and surveying during navigation at sea. Item Type: Parallel Ruler Material: Acrylic Maximum Measuring Distance: Approx. 600mm / 23.62in Usage: Suitable for ships, yachts, boats mapping tools, providing a convenient way to accurately mark distances Package List 1 x Marine Parallel Ruler