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ok the problem was the ph meter...the product is ok,resolved with litmus paper...they can be used to test the soil too

do you use that kit for soil?

damn... as I thought.

yeah very similar to litmus paper, i think is the same thing

google--->advanced hydroponics of holland ph +

i tried with 2 different tester and now im gonna try with litmus paper

Hi, I bought a product to raise and lower the pH (Advanced Hydroponics of Holland + -) however it doesn't seem to be working, the ph is always the same...I used it in the soil mixed with water (ph 6) these are my answers: can be used in soil? can be used mixed only with water instead of...