I bought this and want to keep the ec meter, it works well but the ph meter number never stops, just fluctuates forever. Can I send the ph meter back and get a half refund or a new ph meter? I've tried calibrating a few times and it will still go from 14.96 to 3 or 4 and never stay still so I can't know for sure what the pH is? I used all 3 different buffers at different times, washing with distilled water each time.
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