pH Buffers

pH buffers are used to calibrate pH electrodes, whether it is a lab probe or a sonde sensor. They are color coded based on the pH of the buffer solution. Red solutions have a pH of 4, yellow has a pH of 7 and blue has a pH of 10. When measuring the pH of a sample, the probe should be calibrated with two pH buffers nearest the expected pH of the sample. There are also electrode storage and cleaning solutions for pH and ORP electrodes.

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