I'd say to just buy a ppm meter if you want to know for sure what the ppm of your nutrient solution is. Hannah is a decent brand; Bluelab might be better. Research the care and calibration required for your meter; you'll want the calibrating solutions as well.
Also keep in mind that unless you have a reverse osmosis water filter, you're not starting with a ppm of zero. My tap water is about 250 ppm.
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