Metric Outside Micrometer: Professional design with a locking clamp to hold measurements in place. Satin finish resists rust and reduces glare. Digital External Micrometer: Alloy material. Suitable for teaching usage. Ratchet Thimble Micrometer: Wear resistant with carbide tipped measuring faces for improved wear resistance. Outside Micrometer Caliper: Alloy material, durable, suitable for teaching usage. Use scenarios Quality control and part inspection in machining or manufacturing: measure external dimensions of shafts, pins, bolts, and gears to verify tolerances during setup, assembly, or final inspection. Educational and training environments: classroom or floor demonstrations of proper micrometer technique, measurement practice, and calibration concepts using durable, alloy micrometers. Field service and maintenance: on site checks of external dimensions during repairs, equipment servicing, or routine calibration to ensure proper fit and function of components.