YSI pH and pH/ORP sensors have been carefully designed to perform under all ionic strength conditions, from seawater with a conductivity of 53,000 ?S/cm, to "average" freshwater lakes and rivers with conductivities of 200 to 1500 ?S/cm, to pure mountain streams with conductivities as low as 15 ?S/cm, which has historically been the most difficult medium with respect to accuracy, quick response to pH changes, and minimal flow dependence.
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