Robust Construction: Crafted from superior materials, this door measuring tool boasts a comfortable grip, easily readable scales, and exceptional resistance to and wear, ensuring durability and reliability for extensive use in various environments. Enhanced Vernier Mechanism: Featuring a vernier design, this fire door gauge allows for effortless reading of measurements by sliding the vernier scale. It's an essential tool for precise engineering and construction inspections, providing accurate results every time. Accurate and Detailed Measurements: With a measuring range of 1-15mm and precision up to 0.5mm, this tool offers a clear and precise scale that is crucial for accurately assessing gaps, widths, and deviations in flatness across a range of materials and applications. Versatile Tool for Multiple Uses: Ideal for checking fire door gaps, door widths, and material thickness, this measuring gauge is a versatile instrument suited for detailed house inspections and various engineering tasks, catering to both professional and amateur needs. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour: Material:Metal Package Contents: 1 * wedge caliper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.