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There are only two conversion factors.
One is 700 and the other is 500.
This means that you can mutliply your electro conductivity number
by the conversion factor and get an approximate estimate of the tds
If your EC is .8
then you would have a tds of 400,
if your conversion factor is 500
If your EC is .8 and your conversion factor is 700,
then your tds would be 560
Most of us use meters that are more accurate,
than just to the closest 100th of a part per million.
My $90 Milwaukee Sm104,
reads tds
to plus or minus
10 parts per million.
EC meters are not giving you much information,
no matter that type, or how much they cost.
The number still represents
the amount of electrical current
than your salty nutes
will conduct.
There are many things in your nutrients
that will not be represented by this number,
because they do not conduct electrical current.
very interesting Earl.... which is the cause of conversion facator? so, IYHO a TDS reader is much better than reading EC value, right? I have a EC value of 1.8, how can I convert it to PPM???