Key benefits Locking device fixes the measurement size to prevent clearance changes due to surface irregularities, ensuring stable reads. Small, lightweight outer diameter measuring instrument is portable and easy to carry without taking up space in a bag. Specifically designed to measure the external thickness or diameter of small parts, enabling quick checks on delicate components. Measuring surfaces are made of hard metal for improved accuracy, wear resistance, durability, and long life. Simple, reliable tool suitable for frequent use in workshop or field environments. What it is An external diameter measuring instrument with a locking feature to secure the measurement setting during use. Optimized for measuring small parts' external dimensions and thicknesses with stable, repeatable results. Key attributes Function: measures external thickness or diameter of small parts with a locking mechanism to prevent drift. Compatibility: designed for small parts requiring precise external dimension checks. Size: compact and light enough to carry easily; does not take up substantial space in a tool bag. Material: measuring surfaces crafted from hard metal for precision and wear resistance. Performance: durable, longlasting construction that supports accurate readings over time. Applications and use scenarios Assembly and QA in manufacturing: quickly verify the external diameter of small components such as pins, bushings, or fasteners during assembly or quality control. Maintenance and : check the external dimensions of small shafts or spacers to ensure proper fit during servicing. Toolmaking and precision work: use in workshops to confirm external dimensions of machined parts, ensuring conformity to specifications without repeated adjustments. Notes Designed to provide reliable external measurements for small parts with durable, wearresistant contact surfaces. The locking mechanism helps maintain accuracy by preventing unintended changes to the measurement setting during handling.