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


  • 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, DL6 or DL2e) and leave the system to record soil moisture changes over time.

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 40cm – the PR2/6 measures at 6 depths down to 100cm.

The PR2 Profile Probe access tube requires an installation hole 27mm 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 40cm or 100cm.mcl-28-04-2011-16-17-25

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

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

Complete Auger Kit

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


For Analogue PR2 and SDI-12  PR2

Measurement Volumetric water content
Accuracy ± 0.04 m3.m-3 (4%)
With soil-specific calibration
Soil moisture measurement range Full accuracy over:
0 to 0.4 m3.m-3
Full range : 0 to 1.0 m3.m-3
Salinity range 50 to 400 mS.m-1
Salinity errors included in calibration
Temperature range Full 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 
Environmental IP67 (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 weight PR2/6: 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 calibrations Individual sensors are interchangeable
Recalibration advised every 3 years (depending on use)
Soil calibrations Generalised Mineral and Organic soil calibrations are supplied


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Regulatory Information