These are small rare earth magnets - 0.25" cubed. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches.
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Udsolgt ved leverandør, se leverandørens leveringstid https://www.sparkfun.com/products/8643
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Activates the reed switch (shown below) at a distance of about 3cm.
Sold in single units.
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