- Built in ratchet stop device for accurate, repeatable readings, reducing user variation during multiple measurements. - Locking device and precise machinery structure provide an intuitive, stable setup and easier to read measurements quickly. - High quality alloy measuring heads suitable for various internal size measurements, with fine workmanship and burr free surfaces to protect workpieces and improve reading accuracy. - Clear marking line for easy, fast reading and reduced parallax error. Use scenarios - Inspecting internal bores in automotive engine components such as cylinders and housings during assembly or service to verify bore size within tolerance. - Quality control in manufacturing of hydraulic or pneumatic components where consistent internal diameters must be verified to ensure proper fit and performance. - General workshop use for checking internal dimensions of gears, sleeves, or housings to support precise machining and assembly.