PR2 Profile Probe

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PR2 Profile Probe Zoom
PR2/4 Profile ProbePR2 Profile Probe in the fieldPR2/6 Profile ProbePR2 Profile Probe with HH2 Soil Mositure Meter


"Soil moisture is an important parameter for many of the processes studied in our research – especially at depths below the immediate surface soil. For this reason we have been using the PR2 Profile Probe to measure moisture profiles down to one metre for many years. The PR2 measures soil moisture at varying depths on a total of 240 experimental plots across the Jena facility. The readings are taken on a weekly basis in the spring and summer, and on a bi‐weekly basis in the autumn and winter." Dr Anne Ebeling,
Scientific Coordinator at the Jena Experiment, Germany
(DFG-funded Research Unit)
  • Portable, accurate soil moisture profiles to 1m depth
  • Portable meter option for multi-site measurement
  • Uses access tubes for easy probe insertion and removal

No other soil moisture probe system enables you to monitor your soil water profiles with such ease and flexibility. Install an access tube into the soil, insert the PR2 Profile Probe and press the HH2 [Read] button to display an instantaneous reading. Alternatively, connect the PR2 to a data logger (GP2 or DL6) and leave the system to record soil moisture changes over time.

Video – Introduction to PR2 Profile Probe


The PR2 Profile Probe is built around patented sensing technology which provides excellent performance in all soil types, with minimal influence from either salinity or temperature. The PR2/4 model measures soil moisture at 4 depths down to 40 cm – the PR2/6 measures at 6 depths down to 100 cm.

The PR2 Profile Probe access tube requires an installation hole 27 mm in diameter, allowing easy installation and minimal soil disturbance. Access tubes are manufactured to strict tolerances and are exceptionally strong and durable in the soil. Correct installation is essential and we recommend the use of our specially designed augering equipment.

The PR2 Profile Probe is available in two sizes to measure to a depth of 40 cm or 100 cm.mcl-28-04-2011-16-17-25

The PR2/4 has sensing elements at 10/20/30/40 cm

The PR2/6 has sensing elements at 10/20/30/40/60 and 100 cm

Complete Auger Kit

Access tube installation is vital.
Click here for information about our augering equipment

Further information

The PR2 Profile Probe is also well suited to research applications in horticulture, hydrology, crop science, and water use efficiency. For further details click here.





For Analogue PR2 and SDI-12 PR2

MeasurementVolumetric water content
Accuracy± 0.04 m3.m-3 (4%)
With soil-specific calibration
Soil moisture measurement rangeFull accuracy over:
0 to 0.4 m3.m-3
Full range : 0 to 1.0 m3.m-3
Salinity range50 to 400 mS.m-1
Salinity errors included in calibration
Temperature rangeFull accuracy over: 0 to 40°C
0 to 1.0 V
PR2/6: x6 outputs, PR2/4: x4

Power requirement(ANALOGUE)
5.5-15 V,
PR2/6: ~120 mA for 1s
PR2/4: ~80 mA for 1s
Minimum 7.5 V with 100 m cable
Power consumption <60 mA at 12 V DC
Sleep current <2 mA at 12 V DC
EnvironmentalIP67 (when installed in access tube)
Sample volume -95% sensitivity within a cylinder of diameter 200mm
Sample volume is weighted towards soil immediately surrounding the rods
Dimensions and weightPR2/6: length 1350 mm
PR2/4: length 750 mm
Both: 25.4 mm diameter
PR2/6: weight 1.2 kg
PR2/4: weight 0.8 kg
Sensor calibrationsIndividual sensors are interchangeable
Recalibration advised every 3 years (depending on use)
Soil calibrationsGeneralised Mineral and Organic soil calibrations are supplied


Product Resources

Data Sheets

Case Studies




Regulatory Information