Measures inner diameter, outer diameter, depth, and step for precise size checks. Key features Zero at any position: establish a reference point wherever you work. Metric and imperial conversion: switch between units quickly to match your project requirements. Tuning function: supports quick calibration during use. No battery required: solar panels store power for ongoing measurements. Build and materials Ruler body crafted from strength plastic for durability. Meter shell made of ABS plastic, providing a light, portable, and robust housing. Compact, easy to carry and use in tight spaces. Display and accuracy Glass digital display delivers clear, easytoread measurements. Unit switching between metric and imperial to suit your needs. Use scenarios Woodworking and cabinetry: measure bore holes, dowel diameters, outer diameters of cylinders, depths, and step features to ensure precise fits. Mechanical and metalworking: verify shaft diameters, spacer dimensions, and step transitions for components and fittings. Home DIY and repairs: quickly check part sizes, compare metric and imperial dimensions, and verify replacements. Benefits at a glance Versatile measurement of multiple dimensions (inner/outer diameter, depth, step). Easy unit compatibility with quick metric/imperial switching. Battery operation supported by solar energy storage, reducing maintenance. Lightweight, portable design with a clear digital readout for reliable use in the field.