Ok - so this gives a resistance of 33.3Kohms.  Now I use UK BP purified
water as well and have been very satisfied with it although mine doesn't
state the conductance.  And I use 27V.  In any case the given figure is
pretty useless unless the measuring conditions are specified - size of
electrode, distance apart, etc.

Terry

Steve King wrote:
> 
> >
> >Microsiemens are a measure of conductance; it is the Ohm---unit of
> >resistance, upside down; the reciprocal or 1/Ohms.  It is used to describe
> >the purity of water: the lower the mS reading, the less other things it has
> >in it, and the less conductive it is.
> 
> Very helpful!
> 
> I have in the past bought purified water  here in
> the UK that said: less than 30 microS   on the container.
> - not very pure after all,  I see now. I have also bought
> water that simply says BP, a British standard I think
> for water purity but I don't know the conductivity
> limits.  cheers
> 
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