A professional who inspects and adjusts assembled watch wheels and pinions for surface and mechanical defects, using tweezers, gauges, and loupe. Responsibilities include:

• Examines wheels for levelness, using gauges, and adjusts wheels to correct discrepancies.
• Tests and adjusts endshake (vertical movement) of wheels, using loupe and tweezers.
• Mounts wheels in gauge and observes gauge readings to verify that wheels and pinions are concentric with staff.
• Places straightedge on flat surface of wheels and turns wheels, observing wheels to detect passage of light, to test wheels for flatness.
• Examines wheels to detect scratches and broken teeth, using loupe.
• Segregates faulty and acceptable assemblies.