Octopus Soil Moisture Sensor Brick ozobot It is used to detect

It is used to detect the density of  dust particle with diameter beyond 0

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Octopus Soil Moisture Sensor Brick ozobot It is used to detectOctopus Soil Moisture Sensor Brick can read the amount of moisture present in the soil surrounding it. It's a low tech sensor, but ideal for monitoring an urban garden, or your pet plant's water level. This is a must have tool for a connected garden! This sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level. More water makes the soil conduct electricity more easily (less resistance),