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Enabling better global research outcomes in soil, plant & environmental monitoring.

SMM3 Soil Moisture Meter

The SMM Soil Moisture Meter is a stand-alone logging instrument for the measurement of volumetric moisture content and soil water potential of soils and other materials.

The SMM can support up to 10 capacitance sensors. With a soil water characteristic curve, the SMM can be programmed to simultaneously measure soil water content and soil water potential. Or, up to 10 channels can measure soil water potential. The SMM is a fully self-contained unit requiring power input from a 22W solar panel (field applications) or 24V power supply (laboratory applications). Communication is via a USB port or wireless connectivity. The SMM is IP-65 rated and has a Windows and Mac compatible GUI for complete logging solutions including look-up tables, scripts and sensor calibration capabilities.

  • The SMM is a stand-alone instrument and does not have extensive cabling and power requirements. All data is stored within the unit on a removable MicroSD card.
  • Communication with the SMM is made either with a USB or wireless connection. Wireless is capable of a range of up to 250m.
  • The SMM has a Windows and Mac compatible configuration software. The software is GUI based and extremely user friendly. Custom calibration equations or data can be entered and edited via the software. Real-time measurements, diagnostics and sensor configurations can easily be made.
  • The SMM has a 2 wire, non-polarised bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the SMM is non-polarised.
  • The SMM has an internal lithium-polymer battery that is kept charged by an external power supply (solar panel or mains). The instrument has an internal voltage regulation for maximum power reliability.
  • The SMM is IP65 rated and has been demonstrated to operate in extreme environmental conditions. Units are being used in diverse environments from hot Australian deserts, tropical Amazon rainforests, temperate German forests, Indian agricultural fields and North American Arctic cold.


  • Soil volumetric moisture content (%)
  • Forest and catchment hydrology
  • Soil columns and geo-engineering
  • Railway Embankment
  • Mine Closure-Cover Design Modelling & Performance Monitoring
  • Landfill-GCL & Phytoremediation Performance
  • Modelling Water Movement

Instrument Logging

Analogue Channels 10 single ended
Resolution 0.00001V—24-Bit
Accuracy 0.001V
Minimum Logging Interval 1 second
Delayed Start Suspend Logging, Customised Intervals
Sampling Frequency 10Hz


Communications USB, Wireless Radio Frequency 2.4 GHz
Data Storage MicroSD Card, SDHC & SDXC Compatible (FAT32 format)
Software Compatibility Windows 8, 8.1 & 10. Mac OS X.
Data Compatibility FAT32 compatible for direct exchange of SD card with any Windows PC
Data File Format Comma Separated Values (CSV) for compatibility with all software programs
Memory Capacity Up to 16GB, 4GB microSD card included.

Operating Conditions

Temperature Range -40°C to +80°C
R/H Range 0-100%
Upgradable User Upgradeable firmware using USB boot strap loader function


Internal Battery Specifications
960mAh Lithium Polymer, 4.20 Volts fully charged
External Power Requirements
Bus Power 8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger
USB Power 5 Volts DC
Internal Charge Rate
Bus Power 60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC
USB Power 100mA fixed charge rate
Internal Power Management
Fully Charged Battery 4.20 Volts
Low Power Mode 3.60 Volts – Instrument ceases to take measurements
Discharged Battery 2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected.
Battery Life varies
Example A: With a recommended solar panel and/or recommended power source connected, operation can be continuous.
Example B: Power consumption is dependent on number and type of sensors connected, frequency of measurement and measurement duration
  • MCC Mini
    The MCC Mini is a simple to use USB Serial to Radio Communications device providing a high level of integrity in data transfers. Its miniature design and minimalist approach make it an attractive solution for portable computers and less intrusive workstation setups where space and weight are of concern.

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