- MEASURING RANGE: The caliper tool features a measuring capacity of 0-10cm, providing precise measurements with a clear metric scale. It's ideal for measuring caliber, inner diameter, outer diameter, depth, length, and more. - MULTIFUNCTIONAL BALLPOINT PEN: This innovative retractable ballpoint pen combines a vernier caliper with writing functionality. Perfect for students and professionals alike, it is well-suited for drafting, measuring, drawing, and crafting. - REFILLABLE INK: The pen is designed for convenience with refillable ink. Note: the black pen uses blue ink, while the silver pen uses black ink, allowing you to choose based on your preference. - HIGH-QUALITY MATERIAL: Crafted from durable ABS material, the pen is waterproof, wear-resistant, and anti-rust. Its lightweight and compact design makes it easy to carry. Enjoy a smooth writing experience with quick-drying ink that resists smearing and fading. - PRACTICAL APPLICATIONS: Use this multifunctional tool in various settings, such as classrooms for precision measurements, offices for drafting and writing tasks, or workshops for crafting and DIY projects. This versatile tool combines essential measuring capabilities with everyday writing tasks, making it a must-have for anyone who values precision and functionality.