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The diagram below is a cross-section showing the measurement region around the sensor cable.
95% of the sensitivity to soil moisture is contained within the outer line, which extends to a maximum of 22 mm from the sensor cable. This gives a total measurement volume of 6 Litres (360 cubic inches) over the 3 metre (10 feet) long sensor.
The inner line represents 90% of the sensitivity to soil moisture and extends to a maximum of 16 mm from the sensor cable. This gives a total measurement volume of 3.1 Litres (190 cubic inches) over the 3 metre (10 feet) long sensor.
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