A professional who inspects poise of watch balance wheels to determine if mass of wheel is equally distributed around balance wheel staff, using poising tools and loupe. Responsibilities include:

• Mounts wheel in poising tool that supports staff on knife edges as wheel is rotated in channel, using tweezers.
• Observes rotating wheel to verify evenness of turning, using loupe.
• Removes screw from uneven or heavy area of wheel and mills screw to decrease weight, using hand milling tool.
• Rejects and segregates units if balance wheels are out of poise or if general condition of unit does not meet specifications.