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TEROS 12 (5TE Upgraded Version)Advanced Soil Moisture Sensor + Temperature and EC



  • Brand: METER
  • Model: TEROS 12
  • Product description: Soil can be highly variable in space, requiring many measurements and frustrating amounts of your research dollars. Not to mention the extra cost and hassle of replacement sensors if you need long-te
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TEROS 12 Advanced Soil Moisture Sensor + Temperature and EC Description:

User's Manual

Better accuracy—verified

The TEROS 12 soil moisture sensor 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 12 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.

Small soil moisture sensor lets you think bigger

The TEROS 12 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.

Now you can have everything

We created the TEROS line to eliminate barriers to good accuracy: installation inconsistency, sensor-to-sensor variability, and sensor verification. The TEROS 12 is a long-life, accurate, easy-to-install sensor that combines METER’s legendary technology with an ultra-rugged form and a new calibration procedure to deliver an unbeatable price-to-performance ratio.

With you for the long haul—guaranteed

The culmination of our new TEROS water content line, the TEROS 12 soil moisture, temperature, and electrical conductivity sensor 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 12 soil moisture sensor 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. 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 12.


Increased volume of influence (1010 mL)

Easy installation with borehole installation tool (minimizes air gaps for cleaning readings)

Dependable, long-life volumetric soil moisture sensor

Reduced sensor-to-sensor variability

3-year long-life guarantee

Check installation or troubleshoot with the ZSC Bluetooth sensor interface

Repeatability can be checked with an accuracy verification standard

Robust, epoxy body for tough field conditions

Minimizes salinity and textural effects by using 70 MHz frequency capacitance technology

Steel needles cut through the soil for better soil-sensor contact

Easy-to-use SDI-12 communication for non-METER data loggers

Ferrite core eliminates cable noise

TEROS 12 Advanced Soil Moisture Sensor + Temperature and EC Specification:

Volumetric Water Content(VWC) Range Mineral Soil Calibration:0.00-0.70 m³/m³
Soilless Media Calibration:0.0-1.0 m³/m³
Apparent Dielectric Permittivity(εa):1(air)to 80(water)
NOTE:TheVWC range is dependent on the media the sensor is calibrated to.Acustomcalibration will accommodate the necessary ranges for most substrates.
Resolution 0.0010 m³/m³
Accuracy Generic Calibration:±0.03 m³/m³ (±3.00% VWC) typicalin mineral soils that have solution Ec < 8.000 μS/cm
Medium Specific Calibration: ±0.01-0.02 m³/m³ in any porous medium
Apparent Dielectric Permittivity (εa): 1–40 (soil range) , ±1 εa (unitless) 40–80, 15% of measurement
Measurement Specifications Temperature 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
Dielectric Measurement Frequency 70 MHz
Bulk Electrical Conductivity (EC) Range: 0–20,000 μS/cm (bulk)
Resolution: 1 μS/cm
Accuracy: +/- (5% + 10 μS/cm) from 0–10,000 μS/cm
+/- 8% from 10,000–20,000 μS/cm
Measurement Volume See comparison article
Communication Specifications Output DDI serial or SDI-12 communication protocol
Data Logger Compatibility METERZL6,EM60,and Em50 data loggers or any data acquisition system capable of4.0-to 15-VDC power and serial or SDI-12 communication
Physical Specifications Dimensions Length:9.4 cm(3.70in)
Width:2.4 cm (0.95in)
Height: 7.5 cm (2.95 in)
Probe Length 5.5 cm (2.17 in)
Operating Temperature Range Minimum:-40.00°℃
Typical: NA
NOTE:Sensors may be used at higher temperatures under certain conditions:contact Customer Support for assistance.
Cable Length 5 m(standard)
75 m(maximum custom cable length)
NOTE:Contact Customer Support if a nonstandard cable lengthis needed.
Cable Diameter 0.165 +0.004(4.20+0.10mm) with minimum jacket of 0.030(0.760 mm)
Connector Types Stereo plug connector or stripped and tinned wires
Stereo Plug Connector Diameter 3.5 mm
Conductor Gauge 22-AWG/24-AWG drain wire
Electrical and Timing Characteristics Supply Voltage (VCC to GND) Minimum:4.0VDC
Typical: NA
Maximum:15.0 VDC
Digital Input Voltage(Logic High) Minimum:2.8 V
Typical:3.6 V
Maximum:5.0 V
Digital Input Voltage (Logic Low) Minimum: -0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Digital Output Voltage(Logic High) Minimum: NA
Typical: 3.6 V
Maximum: NA
Power Line Slew Rate Minimum: 1.0 V/ms
Typical: NA
Maximum: NA
Current Drain (During 25-ms Measurement) Minimum: 3.0 mA
Typical: 3.6 mA
Maximum: 16.0 mA
Current Drain (While Asleep) Minimum: NA
Typical: 0.0 mA
Maximum: NA
Power Up Time(DDI Serial) Minimum: 80 ms
Typical: NA
Maximum: 100 ms
Power Up Time(SDI-12) Minimum: NA
Typical: 245 ms
Maximum: NA
Power Up Time(SDI-12, DDI Serial Disabled) Minimum: 145 ms
Typical: 155 ms
Maximum: 165 ms
Measurement Duration Minimum: 25 ms
Typical: NA
Maximum: 150 ms
Other Compliance Manufactured under ISO 9001:2015
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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