The LI-COR LI-300 and LI-350 are rugged sensors designed for accurate, long-term monitoring of soil moisture and soil temperature. The more advanced LI-350 also measures soil Electrical Conductivity (EC).
The sensors are designed for professional applications including agriculture, greenhouses, irrigation management, horticulture and environmental research. Their watertight construction and stainless-steel tines make them suitable for long-term use across a wide range of soils and growing media.
Both sensors measure Volumetric Water Content (VWC) and soil temperature. The right model depends on the parameters you need to measure and how you want to integrate the sensor into your monitoring system.
| Feature | LI-300 | LI-350 |
|---|---|---|
| Soil moisture (VWC) | ✓ | ✓ |
| Soil temperature | ✓ | ✓ |
| Electrical Conductivity (EC) | – | ✓ |
| Output | Analog voltage | SDI-12 |
| Connection | Bare leads | Bare leads or M12 |
| Calibration | Factory calibration | Factory + 2 user calibrations |
The LI-300 is a practical solution when soil moisture and temperature are your primary measurements and an analog output is required.
The LI-350 provides additional functionality by measuring bulk EC and using a digital SDI-12 interface, making it particularly suitable for more advanced monitoring networks and research installations.
The LI-300 and LI-350 measure Volumetric Water Content (VWC) in soil and growing media.
The measurement range extends from 0.0 to 1.0 m³/m³, with a typical accuracy of ±0.03 m³/m³ for factory-calibrated soils.
This allows you to accurately monitor changes in soil or substrate water content, making the sensors suitable for applications such as irrigation management, crop research and long-term soil monitoring.
The LI-300 and LI-350 are designed for use across a wide range of soils and substrates.
Applications include:
For soils and substrates with different compositions, the LI-350 supports two user-defined custom calibrations in addition to its factory calibration. This allows measurements to be better matched to your specific growing medium.
In addition to soil moisture, both sensors measure soil temperature across a wide range of -40 to +70 °C.
Simultaneously monitoring soil moisture and temperature provides greater insight into changing soil conditions and the plant root-zone environment.
In addition to soil moisture and temperature, the LI-350 measures bulk Electrical Conductivity (EC).
The measurement range extends from 0 to 20,000 µS/cm.
EC provides information about soil electrical conductivity and is influenced by factors including the concentration of dissolved salts. Combining EC with soil moisture and temperature measurements provides a more comprehensive view of root-zone conditions.
The LI-350 provides direct EC values without requiring additional data post-processing.
The LI-300 and LI-350 are designed to respond quickly to changing soil conditions.
In water, the sensors reach 90% of their final response in less than 20 seconds.
This makes them suitable for both continuous monitoring and research applications where rapidly changing conditions need to be captured.
The LI-300 provides an analog voltage output, making it easy to integrate with compatible data loggers and monitoring systems.
The LI-350 uses the digital SDI-12 interface, a widely used communication standard for environmental and agricultural sensor networks.
Different cable lengths and connection options are available depending on the sensor configuration.
This flexibility makes the sensors easy to integrate into both new and existing monitoring systems.
The LI-COR LI-300 and LI-350 are suitable for applications including:
Reliable soil moisture measurements
Measure Volumetric Water Content with a typical accuracy of ±0.03 m³/m³.
Soil moisture and temperature in one sensor
Both models combine VWC and soil temperature measurements.
EC measurement with the LI-350
The LI-350 additionally measures Electrical Conductivity up to 20,000 µS/cm.
Suitable for different growing media
Designed for applications including mineral soils, coconut coir, peat and potting soil.
Custom calibration
The LI-350 supports two user-defined calibrations in addition to its factory calibration.
Rugged construction
Watertight construction and stainless-steel tines support long-term use.
Flexible integration
Choose analog voltage output with the LI-300 or digital SDI-12 communication with the LI-350.
Would you like to know whether the LI-COR LI-300 or LI-350 is the best solution for your application? Pedak can help you select the right soil moisture sensor and integrate it with a suitable data logging or monitoring system.
Whether you need to monitor soil moisture for irrigation, crop research, greenhouse applications or environmental research, we can help you determine the sensor and configuration that best matches your measurement requirements.
Contact us for advice or a quotation.
Technical specifications
Technical specifications
Soil Moisture – Volumetric Water Content (VWC)
Specification Value
Measurement range 0.0–1.0 m³/m³
Resolution 0.001 m³/m³
Typical accuracy ±0.03 m³/m³
Maximum accuracy deviation ±0.06 m³/m³
Dielectric permittivity
Specification Value
Measurement range 1 (air) to 80 (water)
Resolution 0.002
Accuracy ±1.0
Soil temperature
Specification Value
Measurement range -40 to +70 °C
Resolution 0.1 °C
Accuracy -40 to -20 °C ±0.5 °C
Accuracy -20 to +70 °C ±0.3 °C
Electrical Conductivity – LI-350
Specification Value
Measurement range 0–20,000 µS/cm
Resolution 1 µS/cm
Accuracy 0–10,000 µS/cm ±5%
Accuracy 10,000–20,000 µS/cm ±8%
Data acquisition
Data acquisition
Data acquisition
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