Perform precision assembling or adjusting, within narrow tolerances, of timing devices, such as watches, clocks, or chronometers.

Other names for Timing Device Assemblers, Adjusters, and Calibrators: Adjuster, Assembler, Balance and Hairspring Assembler, Banking Pin Adjuster, Barrel Assembler, Barrel Bridge Assembler, Barrel Endshake Adjuster, Calibration Specialist, Calibrator, Chronometer Adjuster, Chronometer Assembler, Chronometer Assembler and Adjuster, Chronometer Balance and Hairspring Assembler, Clock and Watch Assembler, Clock Repairer, Clockmaker, Dial Maker, Electrical Calibrator, Escapement Maker, Escapement Matcher, Hairspring Adjuster, Hairspring Assembler, Hairspring Setter, Hairspring Staker, Hairspring Truer, Hairspring Vibrator, Horologist, Manufacturing Assembler, Pallet Stone Inserter, Pallet Stone Positioner, Poiser, Time Stamp Assembler, Timing Adjuster, Truer, Watch Assembler, Watch Repairer, Watch Technician, Watch Train Assembler, Watchmaker,

• Adjust sizes or positioning of timepiece parts to achieve specified fit or function, using calipers, fixtures, and loupes.
• Assemble and install components of timepieces to complete mechanisms, using watchmakers' tools and loupes.
• Bend parts, such as hairsprings, pallets, barrel covers, and bridges, to correct deficiencies in truing or endshake, using tweezers.
• Clean and lubricate timepiece parts and assemblies, using solvents, buff sticks, and oil.
• Disassemble timepieces such as watches, clocks, and chronometers so that repairs can be made.
• Examine components of timepieces such as watches, clocks, or chronometers for defects, using loupes or microscopes.
• Mount hairsprings and balance wheel assemblies between jaws of truing calipers.
• Observe operation of timepiece parts and subassemblies to determine accuracy of movement, and to diagnose causes of defects.
• Replace specified parts to repair malfunctioning timepieces, using watchmakers' tools, loupes, and holding fixtures.
• Review blueprints, sketches, or work orders to gather information about tasks to be completed.
• Test operation and fit of timepiece parts and subassemblies, using electronic testing equipment, tweezers, watchmakers' tools, and loupes.
• Bend inner coils of springs away from or toward collets, using tweezers, in order to locate centers of collets in centers of springs, and to correct errors resulting from faulty colleting of coils.
• Change timing weights on balance wheels to correct deficient timing.
• Estimate spaces between collets and first inner coils in order to determine if spaces are within acceptable limits.
• Examine and adjust hairspring assemblies to ensure horizontal and circular alignment of hairsprings, using calipers, loupes, and watchmakers' tools.
• Tighten or replace loose jewels, using watchmakers' tools.
• Turn wheels of calipers and examine springs, using loupes, to determine if center coils appear as perfect circles.