Soil Humidity Sensor
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http://dx.com/p/diy-soil-humidity-sensor-black-yellow-175463
Sensitivity adjustable, Uses LM393 chip, Power supply: 3.3V or 5V
http://dx.com/p/diy-soil-humidity-sensor-black-yellow-175463
Sensitivity adjustable, Uses LM393 chip, Power supply: 3.3V or 5V