When you need to check the PH of water, this is a handy and handy little tool. It's not very big, fits easily in a shirt pocket, and has its own small carry case. We have a swimming pool and we test it regularly. We used this along with the regular PH test kit we have. It is very accurate and the display is easy to read. The only thing I didn't like was that it had to be calibrated with distilled water (which we didn't have) before using it, so I gave it 3 stars just for ease of use. We will definitely continue to use this. I think this also works well for aquariums, tap water (well or city water), spas, etc.
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