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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.
To use the visual method is simple. A pH sensitive indicator is placed in the measured solution and the indicator will change color depending on the pH level. To get the pH value, compare the color to the pH chart that comes with the indicator.The accuracy of this method is, for obvious reasons, low. However, it can be used for a rough estimation of the pH level. The pH indicator can either be a chemical indicator or a special pH paper, so-called pH testing strips.etermine the pH level. A common method to measure the pH level is to use a pH indicator and the related pH color chart. There are several methods to measure pH. However, the two most common methods are the indicator, or visual method, and the potentiometric method.