The lower the better.
 If there is nothing in the water, "what" becomes a moot point.
Anything around 3PPM or 6 uS and under might be useable, *and over* isn't very good at all. Doing the "water test" the LED won't immediately dim at around 6 uS as the electrodes are withdrawn from the water. At that point, it's pulling full current and the ramp up to current time variable has been eliminated. Average "good" water is around .8 uS the best I've ever seen was .2 uS [ Microseimens of conductivity per cubic centimeter ] ***IF*** a PPM/TDS meter is reading right, anything 1.99 uS and below will read a zero.

Ode



At 10:25 AM 10/12/2009 -0400, you wrote:
Is there a suggested range of what it should test at?


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