Thank you, BTz. You're turning out to be as nice and helpful as your brother.You measure EC with and EC meter and TDS with a TDS meter. There is a conversion between the two and google is your friend. Here is a link for a quick and easy explaination. What is conductivity and why measure it in ppm, EC, TDS, CF? I hope sharing a link is allowed otherwise they'll be after me again.
There are a some meters out there that measure both EC or PPM TDS. Top end units will include pH as well which some of us consider just as important as what in you feed. I will share that I started out with cheap meters and was very disappointed quickly. Now I use more expensive meters in the $50 to $100 range. There is a company named Apera Instruments and some of their meters have replaceable probe tips that cost less to replace when needed. Apera also has quality calibration liquids to keep your meter accurate. I think @FelipeBlu also has something from that product line. Really easy and simple to use but really accurate.
Any chance you could share this spreadsheet with me? I don't really understand it all but I love tracking stuff.This is their recommended dose for seedlings = EC of 0.24
Doesn’t seem particularly hot to me.
And learning to read the plants is what it’s all about. See above in this journal.