LI-300 & LI-350 Soil Moisture Sensors

The LI-300 and LI-350 Soil Moisture Sensors provide clear, dependable soil moisture measurements across agricultural and environmental applications. Practically designed, these durable and versatile sensors fit seamlessly into your work, whatever—and wherever—it may be.

FIND THE RIGHT FIT

Every project has different needs. Compare the LI-300 and LI-350 below to see which sensor best suits your goals.

FEATURE	LI-300	LI-350
Volumetric Water Content	✓	✓
Soil Temperature	✓	✓
Electrical Conductivity	—	✓
Output	Analog voltage	SDI-12
Termination	Bare leads	Bare leads OR M12 connector
Calibration	Factory only	Factory + 2 user custom calibrations

DESIGNED FOR ALL SEASONS & SOILS

Designed for practical and long-term use, the LI-300 and LI-350 integrate seamlessly into your work, wherever it may be. They feature watertight construction and stainless-steel tines to help withstand multi-season use across a wide range of soils and substrates, including coconut coir, peat, and potting soil.

For soils with different compositions, the LI-350 even supports two user-defined custom calibrations, so you can improve measurement accuracy for your specific medium.

BUILT FOR FLEXIBLE INTEGRATION

Choose the output and connection options that work best for your setup, whether it's in the field, greenhouse, or other location. The LI-300 provides analog voltage output—making data analysis and everyday decision-making straightforward—and the LI-350 offers SDI-12 digital output.

Both sensors are available in bare-lead configurations with multiple cable lengths, including LI-350 cables up to 75 meters, and the LI-350 works with 1- and 5-meter M12 connections. Together, these flexible configurations make it easy to integrate them into both new and existing monitoring setups alike.

RELIABLE ACROSS ALL APPLICATIONS

Get data you can trust, consistently and easily. The LI-350 is designed to provide direct EC values—no post-processing required—for a lower risk of user error and a much simpler workflow.

Its ready-to-use data supports quick, confident decisions across irrigation, crop management, environmental research, and more.

Environmental monitoring
Weather stations
Irrigation management
Greenhouses and vertical farms

Research growth chambers
Crop monitoring
Landscape management
Horticulture

90% RESPONSE

<20

SECONDS

FAST RESPONSE TIME

DIG INTO DATA FASTER

The LI-300 and LI-350 reach 90% of their final response in water in less than 20 seconds, helping you collect timely measurements with minimal wait time.

HOW IT WORKS

ORDERING

	Standard Configurations	Cable Length Options for Bare Leads
LI-300	5 m cable (LI-300-BL-5)	10 m, 25 m, 40 m
LI-350	5 m cable (LI-350-BL-5) 1 m cable (LI-350-M12-1) 5 m cable (LI-350-M12-5)	10 m, 15 m, 25 m, 50 m, 75 m

LI-300
Standard Configuration	5 m cable (LI-300-BL-5)
Cable Length Options	10 m, 25 m, 40 m

LI-350
Standard Configurations	5 m cable (LI-350-BL-5) 1 m cable (LI-350-M12-1) 5 m cable (LI-350-M12-5)
Cable Length Options	10 m, 15 m, 25 m, 50 m, 75 m

SPECIFICATIONS

Volumetric water content
- Range: 0.0 to 1.0 m³ m^-3
- Resolution: 0.001 m³ m^-3
- Accuracy^*:
  - ±0.03 m³ m^-3 typical
  - ±0.06 m³ m^-3 maximum
Dielectric permittivity^**
- Range: 1 (air) to 80 (water) dielectric permittivity units
- Resolution: 0.002 dielectric permittivity units
- Accuracy: ±1.0 dielectric permittivity units

Temperature
- Range: -40 to 70 C
- Resolution: 0.1 C
- Accuracy:
  - ±0.5 C from -40 C to -20 C
  - ±0.3 C from -20 C to 70 C
Electrical conductivity (bulk)
- Range: 0 to 20000 µS cm^-1
- Resolution: 1 µS cm^-1
- Accuracy:
  - ±5 % from 0 to 10000 µS cm^-1
  - ±8 % from 10000 to 20000 µS cm^-1

^*For factory calibration soils.
^**Specifications exclude errors from the Topp (1980) approximation.

Specifications subject to change without notice.