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Seeed Grove - Environmental Sensor Modules - Seeed Studio 101020008, The Grove Moisture Sensor from Seeed Studio has two conductive prongs which can be pushed into soil or other substrate to measure the water content. It returns the moisture as an analogue signal, a small signal means dry, a large signal means wet.Seeed provide technical documentation, example projects and software libraries on their product pages. if you require this information please visit this product's page. Seeed 101020008 Grove - Moisture Sensor For Water, Soil and Plants