This Edu-Logger sensor is based on measuring the vacuum pressure in a tensiometer. A tensiometer is a closed tube with a special ceramic part in its end. The tensiometer is filled with water and put in the soil. If the soil is dry, water goes out by diffusion through the ceramic holes and vacuum pressure is created in the tensiometer. If the soil is wet, the vacuum in the tensiometer pulls water into the tensiometer and the vacuum decreases. This is why soil moisture is measured in pressure level. As with all Edu-Logger Sensors, this must be used with the Edu-Logger USB module code X162672 or the Wi-Fi module code X162773.
