Wide Range Measurement: This gauge accurately measures hole sizes from 8 mm to 150 mm, delivering precise and reliable readings. Retractable Design: The retractable stem allows easy extension and retraction of the inner diameter, enabling quick adjustment for different hole sizes without tools. Adjustable and Precise: The gauge can be set to fit snugly into the hole, ensuring accurate readings and repeatable results. Round Head for Comfort: The userfriendly round head provides a comfortable grip and smooth operation, enhancing usability. Use scenarios: In mechanical assembly, verify bore diameters in engine blocks, housings, and fittings to ensure proper fit and function. During manufacturing quality control, check hole tolerances on produced components to confirm compliance with specifications. In maintenance or fabrication, measure dowel holes, bushings, or reference holes during setup or to ensure correct alignment and performance.