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Magnetised Watch Symptoms: How to Spot and Fix Them
The classic sign of a magnetised mechanical watch is a sudden jump in speed: it starts gaining minutes a day when it was behaving perfectly the week before. Other signs include erratic timekeeping that changes with the watch’s position, and, in severe cases, a watch that stops. A simple compass test at home can back up your suspicion, and a watchmaker can usually put it right quickly. Below we explain what to look for, why it happens, what you can check yourself and what you should leave to a professional.
TL;DR
The most typical symptom is a sudden, large gain in time on a mechanical or automatic watch, often several minutes a day.
Erratic rates, a watch that behaves differently flat and upright, or one that stops, can also point to magnetism.
A compass held near the watch is a quick first test: a needle that swings or deflects is a warning sign.
Demagnetising is usually fast, but poor technique can make things worse, so have a watchmaker do it on a valuable piece.
Analogue quartz watches can recover on their own once away from the field. Electronic quartz watches should never be put through a demagnetiser.
Table of Contents
What a magnetised watch actually does
A mechanical watch keeps time with a balance wheel and a hairspring, a hair-thin coil of metal that breathes in and out. Its timekeeping depends on that coil flexing in a regular, predictable way. Magnetise the parts around it, or the spring itself, and that regularity goes.
The Swiss movement maker ETA describes the result in two parts. According to ETA, a residual magnetic disturbance can cause a significant advance or, in some cases, a considerable delay in the watch, and may call for demagnetisation. ETA also separates two situations. While a watch sits inside a magnetic field, it can show brief stoppages. Once residual magnetisation has built up in its components, accuracy suffers even after the watch has left the field.
That distinction matters in practice. A watch that misbehaves only when it is next to your laptop is a different problem from a watch that now runs fast on your wrist, on the bedside table and in the drawer.
The main symptoms to look for
1. A sudden jump in rate, usually fast
This is the symptom most watchmakers mention first. When adjacent coils of the hairspring are pulled towards one another, they can stick together or interact, which effectively shortens the part of the spring that is free to work. A shorter active spring means a faster balance, so the watch gains. The gain is often dramatic: not a few seconds a day, but minutes.
The word to remember is sudden. A watch that has slowly drifted by ten seconds a day over three years is more likely to need a service than demagnetising. A watch that was within a few seconds a day on Friday and is four minutes fast on Monday is a prime suspect.
2. Erratic or position-dependent timekeeping
Some magnetised watches do not simply run fast. They run fast in one position and slow in another, or the rate wanders from day to day. If you notice the watch gaining when it lies flat on a table overnight but losing or struggling when it is upright, magnetism is one possible cause. This is where a regular owner can confuse magnetism with a dirty or dry movement, which is another reason to get a professional opinion.
3. Running slow, or a considerable delay
The fast-running pattern is the most common, but ETA’s wording makes clear that a delay is possible too. So a watch that now loses time is not automatically cleared of magnetism. Slowing can also come from a knock, worn lubricants or a weak mainspring, so it is a less reliable clue on its own.
4. Stopping
If the hairspring coils cling badly, the balance may not be able to swing properly and the watch can stop altogether. Automatic watches are not immune. If your watch stops and restarts normally once you move away from a speaker, a magnetic clasp or a phone case, you were probably seeing the temporary effect ETA describes.
5. Odd behaviour in the power reserve
Hodinkee lists newly erratic accuracy and unusual power-reserve behaviour among the reasons to consider demagnetising a watch. Again, these are prompts to investigate, not a diagnosis.
What is not a typical magnetism symptom
Magnetism is not the answer to every timekeeping complaint. Be cautious about blaming it when:
the watch has had a hard knock, which can bend a hairspring or damage a pivot;
the watch is many years past its last service and the oil has dried out;
the watch has a loose or damaged crown or stem;
the watch stops for no reason, regardless of what is near it, and has no history of magnetic exposure.
In these cases the cure is a service or repair, not demagnetising. This is why we always suggest a proper look rather than guessing. You can read more about why a documented service matters in our guide to watch service history, value and authenticity.
Where magnetism comes from in everyday life
Magnetic fields are everywhere at home and at work. Owners most often pick them up from:
magnetic clasps on handbags, tablet covers and phone cases;
laptop lids and the area around laptop speakers;
speakers and headphones, including the magnets in their casings;
wireless or induction chargers;
magnetic knife strips, toolboxes and fridge doors;
some watch boxes and presentation cases with magnetic closures;
MRI machines and similar equipment, which are a particular risk and are best avoided with a mechanical watch on your wrist.
No single one of these is usually dramatic. The problem tends to be repetition: a watch put down on the same laptop palm rest or the same speaker every evening.
How to tell if a watch is magnetised: a home check
You do not need special equipment to get a first indication. Two quick checks are worth trying.
The compass test
A traditional analogue compass is the simplest tool. Let the needle settle and bring the watch close, moving it slowly around the needle. Watch what the needle does:
If it stays steady and points north, the watch is unlikely to be strongly magnetised.
If it swings, spins or follows the watch around, the watch is carrying a magnetic charge.
Move the watch away slowly and watch whether the needle returns smoothly. It is worth testing the compass on its own first, away from your phone, keys and laptop, so you are sure the needle behaves normally.
A phone compass app
Phones contain a magnetometer, and many compass or magnetometer apps show the field strength in microtesla. Holding the watch near the sensor and seeing a reading jump or the needle deflect can hint at magnetisation. Treat this as a rough guide only: the sensor position varies from phone to phone, and the phone itself contains magnets. If the app and the compass agree, that is more convincing than either alone.
Rate tracking
The other half of the diagnosis is the watch’s own behaviour. Set the watch against a reliable time source, such as your phone’s clock, wear it normally for 24 hours and note the difference. Repeat for a few days, and note whether the pattern changes between wearing it and resting it flat. A big, sudden change in rate alongside a deflected compass is a strong combination.
What a home test cannot tell you
A compass cannot tell you how severe the magnetisation is, or which parts hold it. A watchmaker can check this with the right instruments and then confirm the result on a timing machine afterwards. If the watch is valuable, a home test is a reason to book an inspection, not a substitute for one.
Do magnets affect quartz watches?
Quartz watches are far less sensitive than mechanical ones, but they are not completely unaffected. The Japan Clock & Watch Association explains that magnetism can cause a watch to stop, lose time or gain time, and that on analogue quartz watches the effect may disappear once the watch is moved away from the magnetic field. In an analogue quartz watch, a small motor drives the hands, and a strong external magnet can disturb it temporarily.
The practical rule is this. If a quartz watch has stopped or misbehaved near a strong magnet, move it away and see whether it recovers. If it does not, have it checked. Do not run an electronic quartz watch through a demagnetiser: the process can damage the delicate circuitry, and it will not help a problem that is not hairspring-related.
What to do if you think your watch is magnetised
Move it away from the likely source. Take it off the laptop, speaker or charger and store it somewhere neutral.
Run the compass test and note the result.
Track the rate for a day or two so you can describe the symptoms accurately.
Decide who does the demagnetising. For a cheap watch you might consider a DIY tool. For anything of value, we would not.
Check the rate again after treatment and over the following days, and avoid the original source.
Can you demagnetise a watch yourself?
It is possible. Hodinkee explains that a watch can be demagnetised with a demagnetiser, and that a watchmaker can do it. It also warns that improper technique can increase a watch’s magnetism. The method it describes is to hold the watch slightly above the device, press and hold the button, slowly raise the watch away, and release the button near the top of its travel.
The key is in the slow, smooth withdrawal. Switch the field off while the watch is still close, and you may leave the watch more magnetised than when you started. That is the main reason we do not recommend experiments on a Rolex, an Omega or any other watch you care about. For the cost of a short appointment, the risk is not worth taking.
If you do use a demagnetiser on a cheap watch, treat the instructions as strict, keep other watches and phones well away, and repeat the rate check afterwards. Never use it on an electronic quartz watch.
Why a watchmaker is the safer route
A professional deals with more than the magnetism. They can open the watch and see whether the hairspring coils are really sticking, whether any parts need attention, and whether the symptom is something else entirely. They can treat the movement rather than the whole watch where that is more appropriate, and then confirm the rate on a timing machine. Demagnetising is often a quick, modest job when magnetism really is the cause. The value of the visit is in knowing that it was.
Perspective: what we see at Horology Kings
Most owners who come to us with a watch running fast have already done something sensible: they noticed. The mistake we see is acting on a guess. A watch that gains time is blamed on magnetism, someone buys a cheap demagnetiser online, and the watch comes back worse or with an underlying fault now masked.
Our view is simple. A magnetised watch is not a damaged watch. It is a watch that needs a short, careful check by someone who can tell it apart from a service issue. Where magnetism is the cause, treatment is typically straightforward. Where it is not, finding out early avoids paying for the wrong fix.
We also think owners should prevent the problem. Keep your watch off laptops and speakers, avoid magnetic cases, and use a plain tray or box at home. If you want an extra layer of protection when buying, look at how a model is designed to resist magnetic fields. Our guide on COSC and METAS verification explains how modern certification handles accuracy, and our notes on warranty versus service papers show how to keep records that protect value.
And if a watch ever comes to us with a problem like this, we want you to leave knowing what was wrong and what, if anything, you should do differently.
— Lewis
Keeping your watch safe from magnetism
A few habits go a long way:
Pick a neutral resting place. A wooden tray or a dedicated watch box away from electronics is ideal.
Keep a distance from chargers and speakers. Wireless chargers and loudspeakers are frequent culprits, especially if you place your watch next to them every night.
Check bag and case closures. Magnetic clasps on tablet covers, wallets and handbags can sit right beside a watch.
Use the compass test now and then. Once or twice a year takes seconds and gives you a baseline.
Choose with magnetism in mind. If you work around strong magnetic fields, ask about anti-magnetic movement designs before you buy. We can help you source a specific watch with that in mind.
Also remember that parts matter. If a watch has had aftermarket components fitted during a repair, it can affect both its behaviour and its value, as we explain in our piece on aftermarket parts and provenance risk.
When to book a watchmaker
Do not wait if you see any of these:
a sudden gain of several minutes a day;
a watch that stops intermittently with no clear cause;
large differences between positions, such as a good rate flat and a very poor one upright;
a compass needle that reacts strongly to the watch;
any change of this kind after a medical scan, a long trip with electronic devices or a new magnetic accessory.
On a valuable watch, the earlier you act, the less likely it is that anything else is going wrong behind the scenes. A fast watch that is left to run can also hide a growing problem.
Our servicing and repair service
Horology Kings offers professional watch repair and servicing by certified horologists. If your watch is behaving oddly, tell us the symptoms when you book, including what you noticed, when it started and what sat near it. Our published servicing prices start from £500 for Rolex, £450 for Omega, £400 for Breitling, and £350 each for Tag Heuer and Cartier, with polishing from £100. Where a watch needs a full service rather than a quick fix, that is the route we will explain to you.
See all brands and details on our watch repair and servicing page. If you would rather sell a watch than repair it, we offer valuations through our sell a watch page, and you can browse authenticated pre-owned watches if you are replacing it.
How magnetism affects value
A magnetised watch is not worth less simply because it was magnetised. But the situation does show up in the way the watch performs, and a buyer or valuer will notice a watch that runs several minutes fast. If you are planning to sell, solve the problem first, keep a record of the work and be open about what was done. A clear, documented history helps a buyer trust the watch, and we cover this in more depth in our guide to service history.
If you are buying, a fast-running watch in an otherwise good condition is worth asking about. Ask whether it has been checked, when it was last serviced and whether the work was documented. That is part of how we present every watch in our luxury watches range.
FAQ
What are the first signs of a magnetised watch?
The usual first sign is a sudden, large gain in time, often minutes a day, on a mechanical or automatic watch that previously kept good time. You may also notice erratic timing or a watch that behaves differently in different positions. Slowing and stopping are possible too, so a compass check and a professional opinion are sensible next steps.
How do I test if my watch is magnetised?
Hold an analogue compass close to the watch and move slowly around it. If the needle swings, spins or deflects, the watch is likely to be magnetised. A phone compass app can offer a second indication, but a watchmaker is the only one who can confirm the problem and its severity.
Can a magnetised watch be fixed?
Yes. Demagnetisation passes the watch or movement through an alternating field that is steadily reduced, which neutralises the residual magnetism. It is often a quick job when magnetism is the real cause. Because poor technique can increase magnetism, it is best done by a watchmaker, who can also check the rate afterwards.
Do magnets damage quartz watches?
Strong magnets can make an analogue quartz watch stop, gain or lose time, but the effect may disappear once the watch is moved away from the magnetic field. Electronic quartz watches should not be demagnetised, as the process can harm their circuits. If a quartz watch does not recover, have it examined.
Does demagnetising harm a watch?
Done correctly on a mechanical movement, it does not. The risk lies in poor technique, such as switching the device off with the watch still close, which can leave more magnetism behind. That is why we recommend professional treatment for any watch of value.
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