Precision stainless steel inside micrometer for accurate boresize measurements. Suitable for mechanical and laboratory applications, with erosionresistant durability. Durable stainless steel construction with clear markings and ergonomic, slip handles for reliable control during intricate measurements. Optimized for measuring engine cylinders, pipe fittings, and precisionmachined components across automotive, manufacturing, and scientific research sectors. Trusted by machinists, inspectors, and STEM educators for professional dimensional analysis in workshops, production lines, and technical training environments. Use scenarios: Automotive work and engine maintenance: verify cylinder bore tolerances and related components during engine rebuilds. Plumbing and piping: measure internal diameters of pipe fittings and hydraulic components to ensure proper fit. Manufacturing QA and education: perform dimensional analysis on machined parts in production lines or teaching laboratories.