Delta-T SM300 Soil Moisture & Temperature Sensor

Delta-T SM300 Soil Moisture & Temperature Sensor

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The Delta-T SM300 sensor offers convenience and cost saving by combining soil moisture and soil temperature measurement. It can be used in all soil types, including saline soils. Engineered for reliability and high performance, the SM300 is well suited to both research and agricultural applications.

The Delta-T SM300 Soil Moisture & Temperature Sensor is a dual purpose soil moisture probe - it can be used both with the HH2 Meter for instant readings, or left in-situ for continuous monitoring with a data logger.

Delta-T SM300 Sensor Improvements

The SM300 incorporates the following improvements over the earlier SM200 design:
• Improved ±2.5% accuracy
• Temperature sensor included
• White body to reduce solar heating effects
• Robust M12 connectors and cabling

Data logging

The SM300 is compatible with all Delta-T Loggers and its 0 to 1V DC output can be handled by most other types of logger. Temperature is measured by a 10k precision thermistor mounted in the sensor body - the SM300 should be fully buried to accurately measure soil temperature.

Instant readings

The SM300 can be used with the Delta-T HH2 hand-held Moisture Meter to take instant soil moisture measurements.

Easy installation

The SM300's cylindrical shape makes it easy to install in augered holes (45mm diameter); the threaded base of the soil moisture sensor can be connected to optional 50cm and 100cm extension rods.


The SM300 measures volumetric soil moisture content with 2.5% accuracy and temperature with 0.5 deg C accuracy. It offers precision and reliability at an affordable price.


Accuracy and ease of use make SM300 Soil Moisture & Temperature Sensors well suited to irrigation applications. Readings can be used to optimise irrigation scheduling, or the SM300 can be installed as part of an automatic irrigation system. The sensor's compact size allows it to be installed in plant pots or grow bags.

Brochure Download

For more information please download the Delta-T SM300 Soil Moisture & Temperature Sensor brochure.

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