08-04-2018, 04:17 AM
Join Date: Apr 2017
Location: New Jersey
| | Re: TDS meter
Originally Posted by Maryland Guppy
I have same meter.
TDS is good, think conductivity is a calculated amount.
Temps take a few seconds to adjust.
It's actually the other way around. The meter measures electrical conductivity, and a fudge factor is used to convert conductivity to TDS. There is no direct measurement of TDS, which can only be determined in the lab by evaporating all water and weigh the solid left behind. The conversion to TDS is only rough approximation depending on what are the solutes. The fudge factor for seawater, for example, will be very different from hard fresh water dominated by Ca and Mg. Does your meter instruction say what is the default fudge factor, or there is an option to input your own.