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3D3DCorrosion test token.
Tokens like this are made by companies that sell zirconium (and other metal) components for chemical reactors, piping, and the like. The idea is that you hang the token in the chemicals you plan to use, and see how it does before ordering the whole setup.
Source: eBay
Contributor: Theodore Gray
Acquired: 19 November, 2007
Text Updated: 19 November, 2007
Price: $10
Size: 1"
Purity: 99.99%