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Measuring TDS levels with ohm meter

A common ohm meter measures the resistance by sending a dc current through whatever is to be measured. In a solution with pos. and neg, ions, these become polarized (?) thus making the reading impossible. If you want to measure conductivity (= reciprok resistance) you have to use ac., which is impossible with a common ohmmeter.
>Date: Sat, 27 Mar 1999 11:12:52 EST
>From: BOLLING37 at aol_com
>Subject: Measuring TDS levels with Ohm meter
>Hello all,
>     I have read that it is possible to measure the amount of Total Dissolved
>(TDS) in your tank using a DVM or analog VOM meter.  There is some fairly
>simple math involved to convert the ohms reading over to a TDS reading.
>Does anyone know how to do this?