S-3 Water Detector is a great way to detect a spill, flood, rain,  leak, etc. It can be used to detect the existence, the level, the volume and the absence of water. It can be used to remind you to water your plants, there is a better Grove sensor for that. The S-3 Water Detector has an array of exposed traces, which read low when water is detected. By using the apparent resistivity parameters, it is mainly used in  environmental protection, engineering geophysical exploration, metal and non-metal mineral resources exploration.