Effortlessly measure outer and inner circle radii, depths, and steps with easy switching between inner diameter, outer diameter, and high precision percentage modes. Includes 5 interchangeable measuring jaws (10mm, 20mm, 30mm, 60mm, 100mm) to meet diverse measurement requirements and deliver precise results. Features a multi-set measuring claw for various arc-shaped radii, ensuring exceptional accuracy for mechanical parts, wooden molds, and architectural steel molds. Equipped with a large high-definition display showing inner and outer diameters, measuring jaws, radius R value, metric and imperial units, length, and arc chord height for easy reading. Crafted from a hard aluminum alloy for improved corrosion resistance and durability, with a data connection port for seamless data transfer to a computer.