Acidity meter is referred to as pH meter for short, and is composed of electrode and electric meter. If the electrode can be reasonably maintained during use, the standard buffer solution is prepared according to the requirements and the electric meter is operated correctly, the pH indication error can be greatly reduced, thereby improving the credibility of the chemical experiment and medical test data. 1. Correct use and maintenance of electrodes 2. Preparation and storage of standard buffer solution 3. Correct calibration of pH meter
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