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Use this sensitive measurement card to determine the water quality based on its total dissolved solids or TDS. Find out if your tap water is clean or keep your aquarium water and more!This set contains the measurement card as well as a detachable waterproof measuring probe of 60 cm. The board has a standard 3-pin header interface connector and has a simple analogue voltage indicator.The TDS measurement ranges from 0 to 1000 ppm and has an accuracy of ± 10% at 25 ° C.This text is machine translated.