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Build your own water quality tester

In response to our item about the commercial TDS (total dissolved solids) water testing tool, somebody sent us a link to this homemade meter, which tests for TDS, EC (electrical conductivity), PPM (parts per million). EC/TDS/PPM Meter On Limited Budget - Link Related [suite...]

Date: 2008-02-26 11:14:14
Blog: MAKE: Blog...

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