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Old February 28, 2018   #3
brownrexx
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Join Date: Feb 2016
Location: Southeastern PA
Posts: 1,419
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Those store bought pH meters are not going to be accurate, no matter which brand that you buy.

I worked in a chemistry laboratory for 20 years and our pH meter was calibrated twice a day with standard solutions to ensure accuracy.

I would not waste my money on the store bought kind. Send a sample to a laboratory.
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