I bought TDS (Total Dissolved Solid) several weeks ago. It is not expensive and nice one.
About TDS....
http://en.wikipedia.org/wiki/Total_dissolved_solids
It can check the TDS value and the temperature and very easy to use...
I checked my RO/DI value.. It is not 0 but I think it is not bad...so I will change the filters after my DI resin
arrived from KZ...
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