A professional who inspects watch subassemblies and incomplete watch movements for mechanical and visual defects, using watchmaker's tools and loupe. Responsibilities include:

• Inspects parts, such as bridges, jewels, and screws, for cracks, scratches, and other surface defects, using loupe.
• Turns wheels to detect amount of vertical play (endshake) and to ascertain if wheels have sufficient freedom, using tweezers and picks.
• Winds mainspring to determine wheel characteristics, such as flatness of path and freedom of movement.
• Examines wheels and pivots for bends and alignment, using loupe.
• Records defects found.