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A pH meter is an essential analytical instrument used to determine the hydrogen ion concentration of a solution accurately, and its proper calibration and operation are necessary for reliable biochemical measurements. Calibration begins with switching on the instrument and allowing sufficient warm-up time for electronic stabilization. The glass electrode and reference electrode are rinsed with distilled water and gently _____ _______ _________ ___ _______ _______ ____ __________ _______.
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