xbricoanswered grow question 4 years ago All looks spot on if you're calibrated good - with all meters, its worth buying the calibrations fluids ( 2 point pH 7 and pH 4 - if you can go pH 10 too, you're golden but 4 & 7 means you're calibrated in the area you need to be) and the EC1.4 fluid for your TDS/EC Meter.
600ppm=1.2ec roughly which is a decent area to be in early veg - would just be wary of still overfeeding as if that's fresh soil, it will hold some nutrients as well so you could still potentially over-do things, just make sure you're not getting burn and if so, dial back the strength by a percentage.
Hope this helps and happy growing! :)