Made with high grade through precisions injections molding, the ruler maintain clear markings and smooth rotation while deformation under prolonged professional use This green flight ruler features construction for lightweight durability, designed specifically for civil aviation training and navigation with accurate angles and distance measurements Crafted from, this measuring tool for easy carrying during field operations or frequent travel, reducing user fatigue Perfect for aviation training, navigation, educational institutions, and research facilities that demand high precisions measurement tools for various technical scenarios The innovative rotating dials design enables multi angles measurements for quick directional positioning in navigation, making it ideal for aviation professional requiring orientation, Manufacturer: Msioytog