The type of pencil used where extreme accuracy is required, especially for working on graphs, diagrams, and charts, is called a mechanical pencil.Characteristics of Mechanical PencilMechanical pencils have a fine, consistent lead that does not need sharpening, allowing for precise and sharp lines.They are ideal for detailed work like graphs, diagrams, and technical drawings because the line thickness stays uniform.The fine tip helps in maintaining accuracy and clarity in drawings and measurements.They also reduce smudging compared to traditional pencils, making the work cleaner and more professional.