Feature 1Enduring Material: Boat triangle rulers are made of high grade acrylic, sturdy and rugged, ensuring long lasting durability and reliability for accurate mapping and measuring. 2Dependable Navigation Tool: The triangle ruler provides a convenient way to accurately mark distances, fully adjustable, and easy to use for fast, precise single handed operations. 3Precise Scale: These multifunctional triangle rulers features engraved scales that are accurate and easy to read, making them a great accessory for drawing and measuring purposes. 4Excellent Transparency: Navigation parallel ruler has high transparency, ensuring it does not obstruct too much information, making it an essential tool for your navigation kit. 5Versatile Usage: Suitable for boats, yachts, and ships, these triangle rulers are a convenient tool to accurately mark distance, offering ease and accuracy in navigation and map plotting. Item Type: Chart Drawing Triangle Ruler Material: Acrylic Product Number: IMPA371007 Maximum Measurement Distance: Approx. 405mm / 15.94in Fitment: Suitable for marine vessels and yachts as drawing tools, providing a convenient way to accurately mark distances Package List 2 x Triangle Ruler