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The magnetic pole detector is a purely mechanical structure, the magnet probe is permanent magnet, the operation is sensitive, it does not need electricity, and it does not need batteries.
And the cost is much lower than electrinic model magnetic pole detector, The price is only one-tenth of the electronic version.
Cat Number: STEM-GLE-0244-WXH
Application: Used for identifying the poles of magnets.
Model: 711001