TEROS 11 Soil Moisture and Temperature Sensor

You need sensor longevity

Soil can be highly variable in space, requiring numerous measurements and frustrating amounts of your research funds. Not to mention the extra cost and hassle of replacement sensors if you need long-term data. Make long-term, large sensor networks simpler, longer-lasting and more affordable with the ultra-dependable TEROS 11 soil moisture and temperature sensor.

TEROS 11: with you for the long haul

The culmination of our new TEROS water content line, the TEROS 11 makes your life easier with a large volume of influence, reduced sensor-to-sensor variability and a near-bulletproof form factor-which lasts up to 10 years in the field. These innovations, along with our well-published capacitance technology, an accuracy verification standard and a blazing fast installation tool have combined to generate our most accurate, easy-to-use, highly durable-yet still economical-soil moisture sensor. In fact, we're so confident about the long life of our TEROS sensor line, we've increased our standard warranty from one to three years.

Legendary technology-long-lasting performance

Backed by over 20 years of soil moisture research, the TEROS 11 combines METER's trademark 70 MHz circuitry with an extremely ruggedized epoxy fill and securely attached, sharpened stainless steel needles that easily slip into the soil and are resistant to salts, so you can worry less about sensor deterioration. Very low power consumption and a high resolution provide increased precision over a longer period of time.

Small sensor lets you think bigger

The TEROS 11 delivers the best volume of influence to sensor size on the market so you're less susceptible to soil variability errors. We've optimized the circuitry in this 9.4-cm sensor to deliver an incredible one-liter volume of influence (versus the 200 mL typical for most sensors). Most soil sensors that measure this much volume are 20 cm or longer, causing installation headaches. Not only that, you can cut your installation time in half or more when you install with the new Borehole Installation tool. The tool mistake-proofs installation, eliminating common errors that cause uncertainty in the data-like air gaps, or preferential flow.

Better accuracy-verified

The TEROS 11 uses a completely new calibration procedure that maximizes accuracy and minimizes sensor-to-sensor variability while keeping the cost reasonable. So you can be confident that every sensor you install is going to read exactly like the next one. Unlike other sensors on the market which spec an unverifiable  ±1.0% VWC accuracy, the TEROS 11 was rigorously tested by our soil physicists across a challenging range of soil types and EC levels so you can be confident in the accuracy of your data.

Plus, TEROS sensor repeatability can be checked with an accuracy verification standard. No other soil moisture sensor has this ability. Just slide the verification clip onto a sensor and plug it into a logger. If it reads within the right range, your sensor is good to go.

Near-instant data gratification

Easy and reliable data collection is part of the TEROS experience. Combine the TEROS 11 with the new ZL6, where all data is connected and delivered in near-real time through the cloud. All you have to do is sit back and let the data flow.

Now you can have everything

The TEROS 11 is a long-life, accurate, easy-to-install sensor that combines METER's legendary high-frequency capacitance technology with an ultra-rugged form and a new calibration procedure to deliver an unbeatable price-to-performance ratio. If you're planning a long-term large sensor network and want long-lasting performance for less work and less of your research budget, then choose the TEROS 11.

Measurement Time Typical: 50ms
Range Mineral soil calibration: 0.00-0.70 m3/m3
Soilless media calibration: 0.0-1.0 m3/m3
Apparent dielectric permittivity (Ea): 1 (air) to 80 (water)
Resoultion 0.001 m3/m3
Accuracy Generic calibration: ±0.03 m3/m3 typical in mineral soils that have solution electrical conductivity <8 dS/m
Medium specific calibration: ±0.01-0.02 m3/m3 in any porous medium
Apparent dielectric permittivity (Ea): 1-40 (soil range) , ±1 Ea (unitless) 40-80, 15% of measurement
Power Requirements
Minimum: 2.8 V
Typical: 3.6 V
Maximum: 3.9 V
Operating Enivornment Temperature Minimum -40 °C
Maximum +60 °C
Physical Properties Dimensions Length: 9.4 cm (3.70 in)
Width: 2.4 cm (0.95 in)
Height: 7.5 cm (2.95 in)
3.5-mm stereo plug connector or stripped and tinned wires
Datalogger Compatibility
(not exclusive)
METER ZL6, EM60, and Em50 data loggers or any data acquisition system capable of 4.0- to 15-VDC power and serial or SDI-12 communication
Cable 5 m (standard)
75 m (maximum custom cable length)
Warranty: Three years, parts and labour

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Labcell Limited exclusively supply and support METER products in the UK & Ireland.

Non UK/Ireland Customers, please contact METER Environment at:www.metergroup.com/environment/

TEROS 11 Volume


  • Low-cost, ruggedized soil moisture sensor
  • Ideal for large sensor networks
  • Sharpened stainless steel needles are securely fastened and reduce breakage
  • Compatible with TEROS Borehole Installation Tool ensuring fast, error-free installation with little site disturbance
  • Measure VWC in a harsh environment
  • Robust epoxy body means it lasts for 10+ years in the field
  • 430 mL volume of influence
  • Plug and play with METER data loggers
  • Ferrite core eliminates cable noise
  • Easy integration with third-party systems

TEROS 11 Manual
Size: 838.3 KB (858,409 bytes)

TEROS 11 Quick-start
Size: 503.0 KB (515,100 bytes)

TEROS 11 Integrators Guide
Size: 296.4 KB (303,532 bytes)

METER Soil Moisture
Size: 638.5 KB (653,862 bytes)

Quotation Request

Email us to request a quotation for the TEROS 11 Soil Moisture and Temperature Sensor