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The choice of the second buffer depends on your application: if you measure values below pH 7, use pH 4 as a second buffer. If you measure values above pH 7, use pH 10 as your second buffer. Some of our pH meter use 3 points calibration, keep in mind to always start with pH 7 first and others after.
Adjust pH by adding PH Up or PH Down solution. Your goal is to get your water in the right pH range for your growing medium. If your pH is too low, you need to add PH Up, and if your pH is too high, you need to add PH Down in order to correct the pH.Re-test to make sure pH is in proper range..) You may need to flush plants with extra water if the pH is way out of whack. 4.) Add all your nutrients and supplements before testing/adjusting pH. Many nutrients/supplements can change the pH of your water. Make sure to add everything to your water before you attempt to test or adjust the pH.