Zeppelingirl1517
420 Member
I have two meters, one PPM from BlueLab and one cheap one that came with my PH tester, that is labeled as a TDS meter.
Can anyone clarify the difference between PPM and TDS? And why would the BlueLab meter read 750ppm on a 700 scale and the off brand meter read at 1411ppm?
BlueLab options: 500scale, 700scale, EC (I’m using 700 scale setting & EC since I’m using Fox Farm nutrients)
Off brand options: ppm & EC readings
I trust the BlueLab one more since I paid much more $ for it, but I’m just wondering. The recording sheet I’m using has places to record EC, TDS and PPM, so how should I be recording the TDS vs PPM I order to give me the best data to adjust my water?
Can anyone clarify the difference between PPM and TDS? And why would the BlueLab meter read 750ppm on a 700 scale and the off brand meter read at 1411ppm?
BlueLab options: 500scale, 700scale, EC (I’m using 700 scale setting & EC since I’m using Fox Farm nutrients)
Off brand options: ppm & EC readings
I trust the BlueLab one more since I paid much more $ for it, but I’m just wondering. The recording sheet I’m using has places to record EC, TDS and PPM, so how should I be recording the TDS vs PPM I order to give me the best data to adjust my water?