Size measurement made simple: Quickly verify screw and nut sizes by tapping or inserting, providing a quick, non-destructive check. Accurately measure specially shaped screws: Precisely determine the length of various uniquely shaped screws to ensure correct replacements. Inch to millimeter conversion: Built-in reference table for easy conversion between inches and millimeters. Comfortable, durable material: Crafted from ABS resin for a comfortable grip and reliable use during measurement tasks. Broad compatibility and practical use: Suitable for common fasteners in home, hobby, and light professional work. Use scenarios: - Home repairs and DIY projects where quick sizing prevents wrong replacements. - Bicycle maintenance requiring precise bolt lengths for components. - Furniture assembly or disassembly to verify screw length and type before tightening.