General description The 5X Marine Ruler Parallel Maps is designed for precise graph drawing and mapping. It allows users to draw lines indicating bearings or courses with accuracy. The ruler operates by having two hands each holding a ruler, which move in parallel to achieve the desired positioning. Technical specifications Length: 450 mm Material: Plastic Color: Transparent Measurement error: +/- 1-3 cm Usage To use, apply appropriate force to remove the static hand-foot while pushing the moving feet. Alternate the movement of the two feet to position the ruler accurately. Ensure to avoid static foot displacement during operation. Other information Package Contents: 5 * Graphic parallel ruler Note: Light shooting and different displays may cause the color of the item to differ slightly from the actual product.