If you can figure it out yourself without instructions both in the box and online then it works great. But since it's "unbranded" and made in China, so none of the instructions are in English, you'll have to spend hours trying to figure out how it works.
Digital PH Meter Tester - Tiaoyeer Water Quality Tester With ATC, 0.01PH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution For Drinking Water, Aquarium, Swimming Pools, Hydroponic
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