Bergeon 30103 Precision Compass in Hardwood Box 13mm Detecting Magnetism

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For detecting magnetism. Jewelled model sapphire on hardened steel point, chromium plated brass.
Engraved dial 13mm. Size 40mm x 40mm x 20mm.
Principle: An object is magnetized when one end of the compass-needle is attracted and the other repelled by it.
If the needle is attracted at both ends, there is no magnetism.
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100% Made By Bergeon Swiss And Brand New