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3D3DPlatinum electrode.
This glass loop contains two platinum electrodes a fixed distance apart. Dipped into a liquid it can be used to measure the conductivity of the liquid, thus indirectly measuring the concentration of something, salt for example, in the solution. Platinum is a good material for such electrodes because it does not corrode even under very strong chemical attack.
Source: eBay seller gainexpress
Contributor: Theodore Gray
Acquired: 17 April, 2009
Text Updated: 17 April, 2009
Price: $25
Size: 0.25"
Purity: 99%