Dust Blowers are an essential tool when repairing or changing watch batteries and movements. Bergeon 5733, A*F 18666, large selection of dust blowers comprised of various shapes and materials.
Pressing the dust blower natural air is recycled and blown into small areas to disperse dust particles from the watch. Always avoid blowing onto the movement yourself, this can deposit moisture into the watch and cause problems later.

There is always a chance fine particles or dust can get into the watch movement so it is always essential to use a Dust Blower.