Immersethe electrodes in a second standard buffer solution.The readingof the meter shall agree with the known pH of the secondstandard buffer solution within 0.05 unit without changingthe setting of the standardization of asymmetry potentialcontrol. Rinse the electrodes with distilled water and touch thetips with a dry cloth or tissue to remove excess water. ASTM D1287-11 (2020) pdf free.Standard Test Method for pH of Engine Coolants and Antirusts.
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