A professional who repairs, cleans, and adjusts watches, clocks, and related instruments, using watchmaker's tools, measuring instruments, bench machines, and cleaning equipment. Responsibilities include:

• Removes mechanism from case and examines mechanism for defective parts or accumulation of foreign matter, using loupe.
• Disassembles parts, such as hands, mainspring, escape wheels, and balance wheel, using pliers, screwdriver, and tweezers.
• Places parts into watch-cleaning machine and starts machine that cleans, rinses, and dries parts.
• Tests truing ii of balance wheel assembly, using truing calipers and trues assembly, using tweezers.
• Repairs damaged or worn parts, using watchmaker's lathe and drill press.
• Replaces broken parts, such as mainsprings, hairspring, jewels, stems, escape wheel, and pinions, using handtools.
• Assembles mechanism and oils moving parts.
• Places mechanism in demagnetizing machine that automatically removes magnetic properties from mechanism.
• Replaces mechanism in case and tests assembled instrument for accuracy, using watch-rate recorder.
• Adjusts balance wheel speed regulator to synchronize reading of instrument with recorder.
• May repair jewelry.
• May salvage and repair watchcases and be designated watchcases repairer.
• May repair clocks used in electric power system timing equipment and be designated time-clock repairer.
• May be designated according to type of instrument or instrument subassembly repaired as demand equipment repairer; hairspring repairer.