Let me check those out
Both are the same, just measure differently.
EC20 Measures electrical conductivity (EC), indicating the water’s ability to conduct electricity, which correlates with ion concentration. It’s commonly used in hydroponics, pools, and water treatment.
TDS20 Measures total dissolved solids (TDS), representing the concentration of dissolved substances in water, often expressed in parts per million (ppm). It’s suitable for applications like drinking water testing and aquaculture.
It’s kind of just preference.