Blue Gelato #41

EC or "electrical conductivity" is just a measurement of how easily a electrical current can travel in a liquid. it measures the resistance of it in the solution. Its normally used to measured dissolved salts/solids and sometimes called a PPM pen, however it is not truly PPM. all PPM pens are using a conversion rate of EC to PPM. so 1EC is always 1EC no matter the device. EC is easy to lower or raise it, You just add more water to dilute the dissolved salts, lowering its EC, or add more salts and concentrate, raising its EC. Your plants are looking fine though and I don't think you need to worry much about it. I don't see signs of burning or anything. Good Luck!