The following are reasons why it is helpful to constantly test for Total Dissolved Solids (TDS): * High TDS results in undesirable taste which could be salty, bitter, or metallic.  *Test your water to make sure the filter system has a high rejection rate and know when to change your filter * High TDS indicates Hard water, which causes scale buildup in pipes and valves, inhibiting performance. * TDS levels must be monitored to prevent maintenance problems. * TDS is the best measurement of the nutrient concentration in a hydroponics' solution. Specifications  Measuring range: 0-9990ppm  Accuracy: ± 2%  Weight: 54g  Dimensions: 142 x 25 x 15mm 

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