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Frequency of meter calibration is crucial and will optimize your pH meter’s performance.
Conductivity Meter electrodes invariably become coated with inorganic or organic impurities. This causes a loss of accuracy.
Conductivity (cF, mS) or TDS measurements are used to gauge the total concentration of all salts (i.e. both beneficial and toxic) present in the nutrient solution. They cannot provide any detail on the concentrations of individual nutrients.