The Planted Tank Forum - View Single Post - How to calibrate my ph meter?
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Old 11-25-2012, 12:18 AM   #5
bobc4d
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idealy you should use DI water to mix the solution, which has most chemicals removed and is usually 7.0 pH (neutral) because you are using tap water it is changing the value of the pH solution. you could use a pH buffer to help with using tap water

at work I have a Hach pH meter and do a 3 point pH calibration using pH standard solution of 7, 4 and 10.
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