Magnetic Detection: When a mechanical watch is close to the compass and rotates around it, the compass hand follows the rotation of the watch to indicate that the watch is magnetised. Essential Tool: Perfect for watchmakers or home use, the watch demagnetiser is an essential tool for watch owners. Portable: The watch demagnetiser is lightweight, small in size and very easy to store, making it an essential home repair tool for watch enthusiasts. Degaussing: This machine solves the problem of mechanical watches being exposed to too many computers and electric toys that can cause the hairspring to magnetise and stick, thus causing them to go too fast, too slow or stop. Easy to Operate: The demagnetiser is made of durable plastic and has an indicator light on the housing, so you don't need to go to a shop to have your watch repaired, you can do the work yourself at home.