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Seeed Grove - Environmental Sensor Modules - Seeed Studio 101020018, The Grove Water Sensor from Seeed Studio can be connected to a digital input to detect the presence of water or to an analogue input to measure the amount of water. Applications include tank overflow detection, rainwater measurements and many more.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 101020018 Grove - Water Sensor for Rainfall, Leak and Overflow Detection