The Planted Tank Forum - View Single Post - How to calibrate my ph meter?
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Old 11-25-2012, 04:08 PM   #8
Rev_jim_jones
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Well if it is the same cheap one I got from Ebay then you need to buy a different brand of calibration fluid/powder. The one i received where PH 7.01 (was actually 7.72 with RO water). And yes it is single point calibration.
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