A professional who inspects completed watch and clock movements and motors for defects, such as surface blemishes, missing parts, and misalignment of parts, using loupe, watchmaker's tools, and gauges. Responsibilities include:

• Winds and activates movements to verify prescribed wheel motion.
• Examines movements and motors for defects, such as misalignment of parts, missing parts, cracked or broken parts, and deficient oil content on jewels.
• Replaces or tightens missing screws, using screwdriver; removes scratches on parts, using buffing stick; and oils jewels, using hypodermic syringe.
• May test performance of motors used in electric clocks and timers, using voltmeter and ammeter and be designated motor checker.
• May be designated according to type of movement inspected as balance wheel final inspector.