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Using a high-grade buffer to calibrate your meter before each use is the only tried-and-true way to get the most accurate results every time.pH calibration solutions, also called pH buffers, are an essential tool when measuring pH with a pH meter and electrode. While some users will try to make their own solutions to save money, these homemade buffers are not accurate or stable, and in the end they will waste time and interfere with the accuracy of your results.More Stable And Resistant To ChangeOur AQUASOL Digital pH buffer is much more stable and is resistant to change. Using a high-grade buffer to calibrate your meter before each use is the only tried-and-true way to get the most accurate results every time.1These Solutions Are Available In a Convenient And Economical 500ml Bottle With CertificationA pH meter measures a pH or the acidity/alkalinity of substances. Most pH meters rely on a glass electrode that measures the number of hydrogen ions in the solution. Usually, pH meters need to be calibrated every day or week.