Accuracy crafted stainless steel inside micrometer accurate measurements for various bore sizes, ideal for mechanical and laboratory applications with erosion resistant durability. High stainless steel construction ensures long lasting , featuring markings and ergonomic handles for slip easy control during intricate measurements. Trusted by machinists, inspectors, and STEM educators for professional dimensional analysis in workshops, production lines, and technical training environments. Optimized for measuring engine cylinders, pipe fittings, and accuracy machined components across automotive, manufacturing, and scientific research sectors. This versatile measuring instrument combines portability with laboratory levels accuracy, making it indispensable for both industrial maintenance tasks and advanced engineering projects.