I bought a cheap (under $100.) ph meter last year and it has helped me a lot this year in my home container garden. It seems that my tap water is too high a ph. When I see signs in the plants, usually iron and potassium defficiency, I know my ph is off and measure. I adjust the ph downward in a tub of water and use that at least every 2nd watering or more. Checking with the ph meter I see that some liquid fertilizers make the ph go down and no need for further adustment.
It has been interesting to use and if the meter is not completely accurate it is close enough to give me great results with my tomatoes.
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