How do you know if a demagnetizer works? - Page 2
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  1. #11
    Member OrangeOrange's Avatar
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    Re: How do you know if a demagnetizer works?

    Quote Originally Posted by antilucem View Post
    I have both of the magnetizers discussed above and both work. The 'pass through' is better but requires another hand to press the button while the watch moves slowly through the loop as you hold it.

    The key is to repeat until compass needle is not deflected. Lift watch slowly away from the top of your blue machine until about 24" and then turn off. Repeat as necessary

    However, stop after about 30 seconds (overheat) and repeat again later.

    I have a 3133 which was difficult to demagnetize but I just kept going and now it is accurate to +1 second a day.
    Would the fact that the watch or alarm clock was made out of ferrous metal mean that it could still affect the magnet needle even if it was not magnetized?

  2. #12
    Member antilucem's Avatar
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    Re: How do you know if a demagnetizer works?

    The more ferrite the more magnetic it can become but it should still be possible to demagnetize any ferrous metal. It should not affect the needle after treatment but you may have to repeat on some things.
    Matt_Bored_O likes this.

  3. #13
    Member antilucem's Avatar
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    Re: How do you know if a demagnetizer works?

    Quote Originally Posted by vintorez View Post
    How much do these cost?
    The best 'pass through type' about £20 from China https://www.ebay.co.uk/itm/Professio...gAAOSwO-pcIan7. That is a good price with free delivery because its heavy.
    vintorez and PanKorop like this.

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  5. #14
    Member Matt_Bored_O's Avatar
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    Re: How do you know if a demagnetizer works?

    Quote Originally Posted by OrangeOrange View Post
    Would the fact that the watch or alarm clock was made out of ferrous metal mean that it could still affect the magnet needle even if it was not magnetized?
    Yes.

    Any ferrous metal within range of the needle can cause the needle to deflect since compass needles are themselves also magnetised.

    When testing for magnetism of a part or tool, you must move away from the compass any other ferrous objects.

    Also, keep ferrous object away from the demagnetiser when it is turned ON because those objects can become magnetised.

  6. #15
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    In case you are wondering what is inside of the ‘blue box’. As far as I can see, one can use any power supply (from your laptop, etc) with the same success. 🙂
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