Recent content by Hydrophonic

Ah ok, thanks for the clarification! Odd that they are both out by the same amount. Perhaps the conductivity standard is incorrect...

Anyone have problems with cheap TDS pens? Tried testing a couple in conductivity standard of 2.76mS, but the both are in PPM and display about 1000ppm. Is this correct? The manuals say they have a conversion factor of 500. Does this mean that they should display 1380ppm in 2.76mS standard? Am I...