Durable finish and long service life: vacuum quenching and nickel plating provide a tougher surface and a brighter exterior, helping the tool resist wear in demanding environments. Smooth telescopic rod and precisely curved measuring head: the rod extends smoothly for easy reach, and the measuring head features a wellformed curvature for consistent contact and measurement accuracy. Antislip handle for secure, comfortable operation: designed to reduce slipping and improve control during measurement tasks. Tail locking device for secure length settings: lock the tail by tightening clockwise and unlock by loosening counterclockwise to fix the chosen length during use. Key attributes Material and surface treatment: vacuum quenching with nickel plating for durability and a bright finish. Mechanism: telescopic rod with a curved measuring head for versatile measurement applications. Operation: antislip handle and a locking tail for precise, stable measurements. Applications Automotive and engine maintenance: measure depths and depths in recessed or hardtoreach areas where a curved measuring head is advantageous. Metalworking and woodworking: verify internal depths and ensure proper fit of curved features or joints on components and assemblies. Electronics assembly and QA: check clearance and contour conformity on curved surfaces to ensure proper assembly and performance.