Teros 21 Soil Water Potential Sensor

The TEROS 21 is a high‑precision, maintenance‑free soil water potential (matric potential) sensor designed for long‑term field or lab deployment. Unlike standard volumetric water content sensors, the TEROS 21 allows you to measure how much water in the soil is available to plants / moving — by measuring soil water potential rather than just water content.

Because matric potential is less dependent on soil type than volumetric content, the TEROS 21 provides more comparable data across different soils.

It has a rugged design, integrates temperature measurement, and supports digital communications (SDI‑12 / RS‑232) for easy data logging and networked monitoring.