tds meter

[midgetwaiter]

Originally Posted by Myka

Check calibration, but don't use distilled water as that isn't accurate. You need to calibrate using solution you buy from an LFS that will be anywhere from 800-1400 ppm depending on brand. That will provide a much more accurate calibration than distilled water.

This might help but I wouldn't bet on it making a big difference, especially if you don't know what standard the TDS pen uses. A TDS meter is s conductivity meter that uses one of several standards to then convert this conductivity measurement to TDS on the display. Depending on the standard used you can get differing results.

Really truly pure water measures about 0.05 mS/cm conductivity. Your average cheap TDS meter can't reliably measure less than 5 mS/cm.

I wouldn't get real excited about 2ppm.