The conductivity of tap water is generally very large, basically above 100μS / cm, and some even reach 700μS / cm. If the first-grade water is re-distilled water, the conductive substances in the water are basically discharged, and the electrical conductivity is small. The sudden increase in the conductivity of the secondary water may be due to water contamination or electrode contamination. If the water is contaminated, it should be re-steamed. If the electrode is contaminated, the electrode should be soaked in ether for more than 20 minutes, and then the conductivity of the water should be measured.
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