The TEROS soil moisture sensor is calibrated to measures accurately in 95% of all soil types right out of the box so you don't have to worry about the complexity of calibration.
If it's an unusual soil, or if you need even better accuracy, then a soil-specific calibration might be the way to go (see performance comparison).
Plus, TEROS sensor repeatability can be checked with an accuarcy verification standard. No other soil moisture sensor has this ability. Just slide the verification clip onto a sensor and plug into a logger. If it reads within the range, your sensor is good to go.
The 9.43cm sensor delivers an incredible one-litre volume of influence (versus the 200 mL typical for most sensors). Most soil sensors that measure this much volume are 20cm or longer, causing installation headaches.
| Volumetric Water Content (VWC) |
Range : Mineral Soil Calibration: 0.00 - 0.70m3/m3 Soiless Media Calibration: 0.0 - 1.0m3/m3 Apparent Dielectric Permittivity (εa): 1 (air) to 80 (water) Note: The VWC range is dependent on the media the sensor is calibrated to. A custom calibration will accommodate the necessary ranges for most substrates. Resolution : 0.0010m3/m3 Accuracy : Generic Calibration: ±0.03m3/m3 (±3.00% VWC) typical in mineral soils that have solution EC <8,000 μS/cm Medium Specific Calibration: ±0.01 - 0.02m3/m3 in any porous medium Apparent Dielectric Permittivity (εa): 1 - 40 (soil range), ±1εa (unitless) 40 - 80, 15% of measurement |
| Dielectric Measurement Frequency | 70 MHz |
| Temperature |
Range : -40 to +60°C Resolution : 0.1°C Accuracy : ±1.0°C (from -40 to 0°C) ±0.5°C (from 0 to +60°C) Note: Temperature measurement, for applicable sensors, may not be accurate if sensor is no fully immersed in the medium of interest, due to longer equilibration time. |
| Signal Output | DDI serial, SDI-12 |
| Dimensions |
Length : 9.4cm Width : 2.4cm Height : 7.5cm Probe Length : 5.5cm |
| Cable Length |
Standard : 5m Max. Length : 75m |
| Operating Temperature Range | -40 to +60°C |
| Measurement Duration |
Minimum : 25ms Maximum : 150ms |
| Compliance |
EM ISO/IEC 17050:2010 (CE Mark) 2014/30/EU and 2011/65/EU EN61326-1:2013 and EN55022/CISPR 22 |
