This is a TEROS 12 sensor that measures soil moisture, temperature, and electroconductivity with Modbus digital output. This sensor is fit for a range of soil types and EC levels so you can be confident in the accuracy of your data. This sensor features a 1.01 liter volume of influence.
The TEROS 12 soil moisture sensor combines METER’s well-tested 70 MHz circuitry, a rugged epoxy fill, and salt-resistant, securely attached stainless steel needles that easily slip into soil. Low power consumption and high resolution provide increased precision over long periods of time.
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Range with Mineral Soil Calibration
0.00–0.70 m³/m³
Range with Soilless Media Calibration
0.00-1.0 m³/m³
Apparent Dielectric Permittivity
1 (air) to 80 (water)
Resolution
0.0010 m³/m³ for volumetric water content, 0.10 °C for temperature, and 1 μS/cm for electrical conductivity
Accuracy with Generic Calibration
±0.03 m³/m³ (±3.00% VWC) typical in mineral soils that have solution EC <8,000 μS/cm
Accuracy with Medium Specific Calibration
±0.01–0.02 m³/m³ in any porous medium
Apparent Dielectric Permittivity Accuracy
±15% of measurement
Temperature Range
–40 to +60 °C
Temperature Accuracy
±1.0 °C from –40 to 0 °C ±0.5 °C from 0 to +60 °C
Communication/Output
Modbus
Dimensions
3.7 in x 0.95 in x 2.95 in, with 2.17 in long needles.
Operating Environment
-40 to 60 C
Measurement Duration
25-150 ms
Current Drain
3-16 mA while measuring
