Helps separate magnetism from regulation issues with simple home tests when a watch suddenly starts running fast.
1. Measure current gain against a reliable clock for 24 hours.
2. Keep the watch away from phones, speakers, clasps and bags.
3. Re-measure for another 24 hours.
4. If still fast, consider professional demagnetizing, then re-test.
5. If still fast after demagnetizing, think regulation/service.
Home tests can point the way. They do not replace a timing machine or demagnetizer confirmation.
Why is my watch suddenly running fast?Magnetism is one of the most common sudden causes. Regulation or service issues are more persistent possibilities.
How do I tell magnetism from regulation?If avoiding magnets or demagnetizing improves the rate, magnetism was likely involved. If nothing changes, regulation/service is more likely.
Can a phone magnetise a watch?Strong magnetic sources near the movement can. It depends on exposure and the watch’s resistance.
Should I regulate it myself?No. Test and demagnetize first through safe methods / a professional.