Actually now im pretty sure its probably just the transformer issue forgot those probes are reading voltage instead of wattage or amperage. Gonna have to get a 9v 1a to see if that fixes it.
Howdy, I recently found an old dried up Ph/EC/TDS meter (an HI 9811) and some old buffer solutions that was used in a grow years ago. It seems calibration is going to be impossible. I have tested the solution using 2 different drip test and a strip all three say its still at 7.0. My readings at...