After calibration, the meter worked normally during the day. Commonly used pH goes down, so I checked with an old meter. The old meter had very different readings. I recalibrated using the latest calibration (buffer) package I had. Not even close, this gauge doesn't work properly and fluctuates horribly even after calibration. I'm glad I caught it when I did, it could have been a horror show. My advice is DO NOT BUY this item and not from this seller. Usually these counters are the same, but this garbage. Did a threesome with him and threw him in the trash.
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