3rd point calibration of pH meter
No matter what kind of pH meter it is, the point of pH=7 must be corrected, and the point of pH=7 should be corrected first when performing two-point calibration. When doing calibration, start from 7.0, and the selected standard solution is related to the pH value of the solution to be measured, so that the pH value of the solution can fall within the calibrated pH range. Generally, two points can be used to meet the requirements. If the requirements are very high, the third point is considered. Some instruments can calibrate three points, there is a mode to choose from, you can use this mode directly. Some do not, generally use two-point two-point proofreading, that is, proofread twice.
