Professional Watch Demagnetizer & Repair Kit - Precision Screwdriver, Tweezers & Tools for Mechanical/Quartz Watch Maintenance - Perfect for Watchmakers, Jewelers & DIY Enthusiasts - Home Workshop & Professional Use

Turned it on by holding button, moved watch close to it (a few inches above it) while moving the watch forward, back and side to side just a little. Slowly raised it toward the ceiling and then turned off machine.About a -40 second instant change on my watch time-o-graph machine.I was dealing with 3 different applications using VERY LARGE magnets over the course of 48 hours. Right after that my watch was gaining minutes per day. That means magnet in essence made the spring "stick" and basically shortened it--leading to a much faster running watch.This did the trick.I routinely work with high voltage and powerful magnets. I repair watches, have a time-o-grapher and many other tools and am even building a pocket watch completely from scratch with a lathe and milling machine (plus lots of antique hand tools)--I can't believe it took me this long to buy one of these.It was super inexpensive (but the functionality fits in with my other tools) and works just fine.If your watch runs super fast it probably: needs clean and oil on spring; or has a broken spring that needs replacing; or was magnetized. This is the cheapest, easiest, fastest way to test/repair.