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Old 01/15/2020, 08:35 PM   #2
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,469
Those are actually reasonable close, for hobbyist kits. The Hanna meter, if that's what you are using, has some issues with accuracy, according to a lot of reports. I would go with the API, personally, but both readings are acceptable.

Jonathan Bertoni
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