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I'm curious what most people growing in hydro use most. Personally I have used ph and tds. Most meters I used gave "close numbers" but never seemed to be totally consistent. Lots people preach quality. Finally broke down and bought the bluelab kit. PH and EC meters. Holy shit, what a difference. I will never buy cheap meters again. Now back to the question, when measuring PPM or EC what do you trust more for concentrations? PPM seems more precise cuz it gives you a 3 or 4 digit reading...
PH, EC, and TDS meters
PH, EC, and TDS meters
from Hydroponics / Aeroponics https://www.rollitup.org/t/ph-ec-and-tds-meters.1015934/