Use Zobell solution to verify the performance of your ORP electrodes. Reagent is available in dry form and must be reconstituted with 125 mL of deionized or distilled water prior to use. Bottle label has a place to write the expiration date to guarantee freshness. Redox potential value for Ag/AgCl electrodes is 231±10 mV. Redox potential value for saturated calomel electrodes is 185±10 mV.
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