PPM/TDS Question

Hi guys, i see in various nutirent feeding charts to check PPM of water, in my research it seems some call PPM, others TDS, I do have a TDS handheld meter. Also im using R.O. water with a zero TDS reading, i also use this water for my other hobby, and input i would appreciate.

all are a conversion off of EC

further reading and i see that, i assume most peeps are using R.O. water as thats where the TDS will read near zero? and from there adjust to required ppm/TDS.