I posted a damn conversion chart that proves you are incorrect. You also seem ignorant to the fact that there are 3 different conversions. Hanna, Eutech, and truncheon. There is not just one formula and your formula is incorrect.
STOP spreading bad information. If you don't know what your talking about then don't post garbage. There is enough bad information out there for new growers to wade through. They don't need anymore from someone like you that doesn't have a clue as to what they're talking about.
Look at that damn chart I posted and then tell me how your formula comes close to converting ppm to EC. That chart is an industry standard not some incorrect formula from some guy that won't admit they're wrong when the proof is right in front of them.