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.
https://www.ebay.co.uk/itm/Professio...gAAOSwO-pcIan7. That is a good price with free delivery because its heavy.
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.
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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