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Reed switches.
An example of the element Rhodium

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Reed switches.
These reed switches have rhodium-plated electrical contacts. I don't know why rhodium and not gold, a more common contact material. Reed switches work by opening or closing when a magnet is moved close to the sealed glass tube. These are normally closed switches.
Source: eBay seller virtualvillage-usa
Contributor: Theodore Gray
Acquired: 28 February, 2009
Text Updated: 1 March, 2009
Price: $0.30
Size: 1"
Purity: 98%
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