How close to the soil surface can a CS650 or a CS655 be installed?

Both the CS650 and the CS655 can detect water as far away as 10 cm in wet sand. That distance decreases as the soil dries down to approximately 4 cm in dry sand. In practice, a depth of 5 cm will give a water content reading that is within the sensor accuracy specification even if a small amount of air near the soil surface is detected and averaged into the reading.

Note: Campbell Scientific does not recommend installing the sensor in a depth shallower than 5 cm.

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