【PROFESSIONAL STAINLESS STEEL】 Forged from heavy-duty polished stainless steel, this 6 inch digital caliper delivers a solid, stable feel in hand. Completely eliminates the flimsy warping and precision loss of cheap plastic caliper tools for long-term reliability. 【HIGH MICROMETER PRECISION】 Engineered for accuracy up to ±0.001"/0.02mm, this electronic micrometer caliper digital handles external, internal, depth, and step dimensions seamlessly. Pro Tip: Keep jaws of clean and press ZERO before measuring to prevent any reading drift. 【CLEAR LCD SCREEN & 3 MODES】 The oversized LCD screen of the digital caliper allows easy reading from any angle without eye strain. Instant quick-change button switches between Inch, Metric, and Fraction, serving as your perfect millimeter mm ruler and MM measuring tool without tedious math. 【SMART AUTO-OFF FEATURE】 Never pick up a dead digital caliper measuring tool. Equipped with an intelligent automatic shutdown function, this digital micrometer automatically powers off after 5 minutes of inactivity to maximize battery longevity, ensuring it is always ready for your work. 【COMPLETE READY-TO-USE KIT】 An out-of-the-box package including 3 button cells (two replacement), a mini screwdriver, and a custom hard plastic protective case. Perfect gift and essential vernier caliper measuring tool for 3D printing, woodworking, DIY, and automotive repair.