Description: Professional Design: Aviation Navigation Ruler is a vector ruler designed specifically for civil aviation use, making it an essential tool for pilotsClear Scale: The Fixed Tool for Pilots features clear surface printed scale, ensuring clear and easy to read markings that are great for measurements and training purposesPremium Material: Aviation Navigation Tool is made of premium plastic material, built to withstand the rigors of frequent use in various conditionsProper Size: Premier Fixed Tool is in size 31.7 cmx8.5 cm/12.48 inchx3.35 inch, compact enough to fit in your bag yet large enough to provide accurate measurementsPackage Includes: Each package comes with 1 Aviation Navigation Ruler, a great planning tool for pilots Specification: Material: Plastic Size Chart: 31.7 cmx8.5 cm/12.48 inchx3.35 inch Package Includes: 1 Aviation Navigation Tool Note: Please allow slightly errors 1-2cm differences due to manual measurement.