General description The 4X Marine Ruler is designed for precise mapping and drawing tasks. It allows users to draw graphs, lines, and bearings accurately. The ruler operates with two hands, each holding a parallel ruler, enabling smooth and controlled movements. Technical specifications Length: 450 mm Material: Plastic Color: Transparent Measurement allowed error: +/- 1-3 cm Usage To use the ruler, apply appropriate force to remove the static hand-foot while one hand pushes the moving feet. Move the two feet alternately in parallel to reach the desired position. Ensure alternate movement to avoid static foot displacement. Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.