Specification Brand : ZJchao BulletPoint1 : [Easy to Operate] This navigation ruler is simple and flexible to use, adapting to your needs and daily operations effortlessly. BulletPoint2 : [ Material] Made of copper and acrylic, this ruler features a polished copper spacer that is to oxidation, ensuring a stable performance. BulletPoint3 : [Accurate Navigation] The parallel ruler is for drawing azimuth lines and measuring degrees, providing high accuracy for your chart operations. BulletPoint4 : [Lightweight & Portable] The marine ruler is lightweight, easy to carry, and crafted with excellence for a stable and experience. BulletPoint5 : [Transparent Design] With high transparency and a clear scale, our navigation ruler ensures precise measurements and a great user experience. BulletPoint6 : Spring force gauge with clear scale, easy to use CareInstructions : Wipe Clean with Dry Cloth Color : Golden ExternallyAssignedProductIdentifier : 4678346400905 IncludedComponents : Digital Scale ItemDisplayDimensions_Height : 1.65 inches ItemDisplayDimensions_Length : 6.3 inches ItemDisplayDimensions_Width : 2.17 inches ItemName : Marine Navigation Parallel Ruler, Copper and Acrylic Material, Clear Scale High Accuracy, with Transparent Ship Drawing Tool for Boat Navigation Marine Parallel Ruler Boat ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 61 centimeters ItemPackageDimensions_Width : 8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : fish-scales Manufacturer : ZJchao Material : Metal ModelName : Zjchaohn35yomka6-12 ModelNumber : ZJchaohn35yomka6-12 NumberOfBoxes : 1 NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : ZJchaohn35yomka6-12 ProductDescription : 1. Description of Function: The parallel ruler is used for drawing azimuth lines or navigation lines and measuring azimuth line degrees or heading line degrees when chart operations are carried out. 2. High Transparency: Our navigation parallel ruler has high transparency, clear scale and accurate measurement, so that you can have a nice experience of using it. 3. Copper and Acrylic Material: Our parallel ruler is made of copper and acrylic material, the pure copper spacer is polished, not easy to oxidize and with stable face. 4. Flexible This navigation parallel ruler is very easy and flexible to operate, just follow the actual needs and routine operation. 5. Exquisite Craftsmanship: This marine navigation parallel ruler is light in weight, easy to carry, and exquisite craftsmanship, so you can achieve stable use.