TEROS 12 on field
TEROS 12 TEROS 12 on field
TEROS 12 - Soil Moisture, Temperature & EC sensor

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 accomodate the necessary ranges for most substrates.

Resolution : 0.0010m3/m3

Accuracy : 

Genric 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/min any porous medium

Apparent Dielectric Permittivity (εa): 1 - 40 (soil range), ±1εa (unitless) 40 -80, 15% of measurement


Range : -40 to +60°C

Resolution : 0.10°C

Accuracy : ±0.5°C from -40 to 0°C

±0.3°C from 0 to +60°C

Bulk Electrical Conductivity (EC)

Range : 0 - 20,000 μS/cm (bulk)

Resolution : 1 μS/cm

Accuracy : ±5% + 10μS/cm (from 0 - 10,000 μS/cm) 

± 8% (from 10,000 - 20,000 μS/cm)

Dielectric Measurement Frequency 70 MHz
Signal Output DDI serial, SDI-12

Length : 9.4cm

Width : 2.4cm

Height : 7.5cm

Probe Length : 5.5cm

Operating Temperature Range -40°C to +60°C
Cable Length

Standard : 5m

Max. Length : 75m

Measurement Duration

Minimum : 25ms

Maximum : 150ms


EM ISO/IEC 17050:2010 (CE Mark)

2014/30/EU and 2011/65/EU

EN61326 -1:2013 and EN55022/CISPR 22



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