What do the values on the soil moisture chart's y-axis refer to?
The chart's axis refers to soil moisture tension.
Soil moisture tension is a value that represents how hard a plant has to work to extract water from the soil. The more negative the value, the drier the soil.
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- How does the sensor station measure soil moisture?- We use Irrometer's Watermark sensors & Sentek's Drill & Drop sensors to measure moisture. Each Watermark sensor station contains between up to 5 Irrometer Watermark soil moisture sensors, which have been used & trusted by growers for nearly 40 years. ... 
- How often does the sensor measure soil moisture?- Our sensor stations record data at regular intervals so you can make decisions with up-to-date information. Trellis sensor stations measure soil moisture every 2 hours. This information is relayed to the central base station, which uploads the data ... 
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- How do I create a custom soil texture?- Navigate to the sensor page where you'd like to create a custom soil type: Click the pencil icon to edit your sensor information: Click your current soil texture (see green rectangle below): A new window will pop-up. Click "Add New" (see green ...