PR2 Soil Moisture Profile Probe

Delta T


Two models to choose from:

PR2 / 4 Has Sensor Elements at 10, 20, 30 and 40cm

PR2 / 6 Has Sensor Elements in 10, 20, 30, 40, 60 and 100cm

The PR2 is available in both Analogue and SDI-12 versions.

1 340,00 €

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The Sensor measures: Soil Humidity
Sensor for use in: Outdoor
Sensors Accessories: Various

PR2 Soil Moisture Profile Probe


  • Soil moisture content - not just trends
  • Low salinity and temperature sensitivity
  • Portable meter option for convenient multi-site measurement
  • Out of the box solution - supplied with soil calibrations for common soil types
  • IP68 protected connectors for versatile connectivity
  • 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, or connect the PR2 to a data logger (DL6 or DL2e) and leave the system to record soil moisture changes over time.

The PR2 soil moisture probe is built around newly patented sensing technology which provides unprecedented 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 or 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

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 

Data Logging

Delta-T offers two types of data logger with dedicated PR2 Profile Probe
input channels and connectors:
The DL6 Data Logger can log one PR2/6 or one PR2/4 Profile Probe.
The GP2 Data Logger can log up to two PR2/6s or three PR2/4s.


Complete Auger Kit
Access tube installation is vital. 

Brief specifications


0 to 0.4 m3.m-3 [1]


± 0.04 m3.m-3


PR2/6: 6 x 0 to 1.0V [2]
PR2/4: 4 x 0 to 1.0V


5.5 to 15V [3]
PR2/6: ~120mA for 1s
PR24: ~80mA for 1s

Sensing depths

PR2/6: 10, 20, 30, 40, 60, 100 cm
PR2/4: 10, 20, 30, 40 cm (nominal)

Sampling Volume

Vertically: ~95% sensitivity within ± 50mm of upper rings.
Horizontally: ~95% sensitivity within 200mm dia.


PR2/4: 750 x 25.4mm dia.
PR2/6: 1350 x 25.4mm dia.



Access tubes


ATL1: 1154mm x 28mm dia 
ATS1: 554mm x 28mm dia


[1] Measures full range up to 1.0 m3.m-3 with reduced accuracy
[2] Corresponding to 0 to 0.6 m3.m-3
[3] 5.5V DC with 2m cable, 7.5V with 100m

PRC/w-05  5m cable PR2 to bare wire
PRC/d-HH2  1.5m cable PR2 to HH2
PRC/M12-05  5m cable PR2 to DL6
EXT/8W-05   5m extension cable
EXT/8W-10   10m extension cable
EXT/8W-25   25m extension cable
ATS1  Access tube - short
ATL1  Access tube - long
AUGER  PR2 Installation
SPA1  Access tube spacer
PR-CB2  Carrying bag for PR2
PR2-SP  PR2 Profile Probe spares kit

See how to install the PR2. The following Video explains how the probe can be used for both portable readings and installed long-term monitoring, and shows how accurate soil profile moisture measurements (down to 1 metre) can be taken with ease.