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Message: [QUOTE="YumYum, post: 273005, member: 16951"] Those cheap pH testers with the probe you stick in the dirt won't work in liquid. You would think they would work in liquid but they don't. Sometimes I can't even get them to work right in damp soil. I will have to say when they do work in the dirt they seem to be fairly close. I've never had one to work right in potting mix. You could use vinegar but you should know what the final pH of the irrigation water is before you blindly water your plants with it or you can damage some plants. There are also other options as stated above. [/QUOTE]