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These instruments are used to check if your nutrient solution has the correct pH (between 5.5 and 6.5 for most plants), and the Total Dissolved Solids (TDS) of a solution, i.e. the “concentration” (references are on the feeding schedule of your nutrient line), they can prevent significant stresses and unwanted alterations in the plant’s growth.
Some of the more advanced water analysis instruments measure more than just the pH and TDS of a solution. Make sure to clean and store properly your instruments to preserve their measuring probes as these can be quite sensitive.