The best PPM meter that has lasted the longest is the Dip Stick. It doesn't need calibrating and has an automatic shut off for people like me who leave the pen on and the batteries die. Cost $110.00 but well worth it.
Here in Florida I can grow just about any herb. Their is a greenhouse down the road that sells 150 verities that I am going to try to see which ones do best in hydroponics. I will let you know.
If you let me know what comment you are referring to I will post it right under the comment so it will make sense.
Ron
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