Versatile cylindrical hole gauge with multiple specifications and interchangeable probes to measure a range of internal diameters. Tool steel construction ensures precise workmanship and durability. High-strength non-slip holding element with a frosted finish and thick, easy-to-read markings for reliable operation in demanding conditions. Ergonomic design with a thick frosted steel handle for a secure grip and comfort. Built for long life and dependable performance. Improved readability with a large dial indicator for clear measurements and fast evaluation. User-friendly dial design enhances efficiency for speed-critical measurements. Compatible with suitable probes; hardened construction supports durable inner diameter measurements. Use scenarios: - In manufacturing and assembly, verify bore sizes in engine blocks, hydraulic cylinders, and similar components. - In toolmaking and CNC production, check and sort internal hole sizes during fabrication and quality control. - In maintenance and repair, confirm clearances and fits of shafts, bearings, or other internal features in machinery.