Made from high-quality hard aluminum alloy for both probe and shell, this gauge provides superior corrosion resistance compared to plastic materials, ensuring a longer lifespan. It includes a data connection port for easy computer connection and data output. Accurate Measurements: The digital display delivers precise results with high accuracy—radius measurement error ΔR≤0.01*R and linear measurement error ΔS≤0.02mm, where R is the radius and S is the displacement. Versatile Measuring Jaws: Includes 5 interchangeable measuring jaws (10mm, 20mm, 30mm, 60mm, and 100mm) to accommodate various arc surfaces radii, allowing users to select the appropriate jaw for different measurement needs. Specialized for Arc Measurements: Features a multi-set claw design for precise measurements on arc surfaces in applications such as mechanical components, wooden molds, and architectural steel molds. Inch/Metric Flexibility: Easily switch between millimeters and in for all measurements. The compact design ensures easy handling and reading, making it an ideal portable tool for quick and efficient use.