Hello list, I need advice on measuring the conductivity of water.

I recently bought a used water distiller, and the starting current for CS
is 20%-50% higher than it was previously with store-bought distilled
water, with all other factors being equal.  The logical conclusion is
that my Kenmore (mfg by Ecowater) distilled water is of lesser quality
than the DW I get from the grocery store.  Current is still MUCH lower
than with tap water, so I know the distiller is doing something.  But is
it enough?

I ran one gallon through the distiller twice to see if there was a
difference, but it resulted in roughly the same initial current as a
gallon that had been distilled only once.  I’ll have to repeat this
experiment a few times to see if any pattern develops.

I'd like to measure the conductivity of water from both sources to
compare quality.  I’ve read on this list that conductivity should be 2uS
or less to be suitable for making CS.  Is there a way I can calculate
conductivity using my simple 7-function digital multimeter?  I don’t want
to blow $50-$100 on a PWT tester.

I have enough trouble getting a simple resistance reading of my circuit
through the DW – the readout never holds still and jumps over a wide
range of values; maybe I’m doing it wrong.  But I can still calculate
resistance by dividing voltage by current (is that right?  I think I saw
Ivan post to that effect a few weeks ago).  Any advice will be appreciated

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