Portable Soil SensorPortable Soil Sensor

Portable Soil Sensor


  • Instantly measure soil moisture, electrical conductivity, and temperature
  • Collect data with Apple or Andoid App on your smart phone / device
  • Wireless data collection via Wi-Fi

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The Field HydraProbe Portable Wireless Soil Sensor puts the power of the popular Stevens Hydra Probe in the palm of your hand

Featuring the Stevens Hydramon app for Apple and Android smart phones, you are free to take soil measurements anywhere, at any time, without the timre requirements of setting up a permanent soil monitoring system.

With the Stevens Hydramon app, taking soil readings is easy. Simply insert the probe into the soil, and tap on the “Sample” button on the app. The app will display soil moisture content, temperature, conductivity, and dielectric permittivity on-screen for immediate viewing. All data and GPS measurement locations can be saved to the app and emailed as a .CSV for analysis in Excel or other spreadsheet or database program.

The Hydramon app is available for Apple iPhone, iPad, or iTouch, and is also available for Android devices. These devices communicate wirelessly with the HydraProbe using an ad-hoc wi-fi network created by the HydraProbe itself.

If the devices used has GPS available, the location of each measurement can be recorded along with the soil measurement data. Note: GPS is not available on some iPad or iTouch models. The HydraProbe system features a rugged, anodized aluminum housing that contains a rechargeable battery that powers the connected Hydra Probe and built-in wi-fi radio. The HydraProbe also features a LCD screen that indicates battery voltage as well as an on/off switch. The HydraProbe comes with a carry strap of easy on-the-go measurements.


  • Instantly measure soil moisture, electrical conductivity, and temperature
  • No installation necessary, just insert the probe and tap “Sample”
  • Optimize soil analysis, watering and fertilization
  • Enables measurement of native (undisturbed) soil
  • Low risk: 20 years of field-proven science
  • Performs well in high-salinity soil
  • Easier monitoring of remote sites



  • Collect data with Apple or Andoid App on your smart phone / device
  • Wireless data collection via Wi-Fi
  • Instantaneous sensor response
  • Detatchable probe with weather-proof connector
  • Rechargeable battery
  • Battery voltage indicator screen
  • No calibration for most soils
  • Compact & rugged for years of use
  • The only portable soil sensor that measures both components of the complex dielectric permittivity



  • Spot checking of soil
  • Golf & sports turf management
  • Precision agriculture/fertigation
  • Greenhouse applications
  • Agriculture research
  • Watershed management
  • Academic/classroom use
  • Laboratory research


Logged Soil Measurement Parameters

1. Date
2. Time
3. Soil Type
4. Location
5. Coordinates
6. Soil Temp (C)
7. Soil Temp (F)
8. Soil Moisture
9. Soil Electrical Conductivity
10. Soil Electrical Conductivity (temperature compensated)
11. Real Dielectric Permittivity
12. Real Dielectric Permittivity (temperature compensated)
13. Imaginary Dielectric Permittivity
14. Imaginary Dielectric Permittivity (temperature compensated)
15. Diode Temperature
16. Voltage 1
17. Voltage 2
18. Voltage 3
19. Voltage 4
20. Voltage 5
21. Latitude and Longitude (if GPS is available)

Typical MeasurementsRangeAccuracy
Dielectric Permittivity 1 to 80 where 1 = air 80 = distilled water± 1.5% or 0.2 whichever is typically greater
Soil Moisture for inorganic & mineral soilFrom completely dry to fully saturated> ± 0.03 water fraction by volume max in typical soil
Conductivity0.01 to 1.5 S/m± 2.0% or 0.005 S/m whichever is typically greater
Temperature-10° to +55° C± 0.1° C
Battery TypeRechargeable NiMH battery, 12V / 3500mAh
HousingBlack Anodized Aluminum
Cable22 gauge, UV Resistant
Operating Temperature -10° C to +65° C
Water ResistancePROBE tolerates continuous full immersion in liquid
ProbeFully potted 304-grade stainless steel, shock resistant
Length x Width x Height6.75 in x 4 in x 2.5 in (L x W x D)
Weight4.1 lbs (1.85 kg)