Currently, moisture accuracy is influenced by several factors including soil texture, quality, moisture content, and temperature. The Garden Sensor's moisture calibration depends on the variety of soil you have selected. Accuracy can be improved by paying attention to the type of soil, and we are working to fine tune our measurement algorithms. In the meantime, there may be some variation, for example, a moisture reading of 30% may fall into the range of 25-34%.
If you feel that your moisture readings are too low or too high, please let us know via email at email@example.com.