The first lasted two weeks and stopped working. I just got the second one. I've tried calibrating it but it behaves like it has a short circuit and keeps restarting (like the first one). I bought it as an upgrade to an Oakton pH meter. (I've had three of these, but they only last about a year before the sensor fails.) I expected great results from the very expensive Oakton 5+, but my experience with this gauge was poor. I won't buy another one of these.
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