• Portable Wireless Soil Sensor

Portable Wireless Soil Sensor

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The Stevens Wi-Fi POGO Portable Wireless Soil Sensor puts the power of the popular Stevens Hydra Probe in the palm of your hand and allows for easy soil measurement anywhere

Using built in Wi-Fi the POGO connects wirelessly with your Apple iPhone, iPod Touch, iPad, or Android smart phones and tablets to collect soil data using the free Stevens HydraMon App, available for download from the Apple App Store or Android Marketplace (search “Stevens Water” or “HydraMon” to find the app).

Using the Stevens POGO, you’re free to take soil measurements anywhere at any time, without the time requirements of setting up a permanent soil monitoring system.

With the Stevens HydraMon App taking soil readings is easy. Simply insert the probe end of the POGO into the soil, select the correct soil type from the menu, and tap the “Sample” button on your Apple/Android device’s screen.

The App will display soil temperature, conductivity and dielectric permittivity on-screen for immediate viewing. The user also has the option to log with time and date stamp all sensor measurements to a file with optional GPS location coordinates also recorded. Saved data can then be easily sent via email as a CSV file for further analysis.

The POGO features a rugged, anodized aluminum housing that contains a rechargeable battery pack that powers the Hydra Probe. The POGO also has an LCD screen that indicates battery voltage as well as an on/off switch.

Four (4) single-ended analog input channels are available and feature voltage surge and lightning protection to help protect sensitive instruments in areas with storm activity. 

Supported measurement and sensor types include temperature, 0-5 Vdc, 4-20mA, and pulse inputs for tipping buckets - with programmable log - ging and reporting intervals. The DLight provides a 24 Vdc loop power supply with sufficient current to drive sensors.

The DLight provides several popular data bus I/O’s including; SDI-12, one (1) RS-232 port, and USB 2.0. Other digital features include a Secure Digital SD card interface that can store up to two gigabytes of sampled data.
The DLight supports connection to telemetry over the RS-232 port for reporting data over cellular, UHF/VHF, or satellite systems such as GOES.


  • Inputs: Analog, Pulse, SDI-12
  • Outputs: V-out, Alarm, RS-232
  • Simple configuration for telemetry applications:
    - Satellite
    - Radio (UHF/VHF)
    - Bluetooth
    - Wireless mesh networks
    - Cell modem
  • High-speed USB 2.0 port (compatible with USB 1.0 devices)
  • SD memory card slot
  • Windows software for easy:
    - Configuration and diagnostics
    - Rapid data exchange to PC
    - Tabular analysis
    - Data export to other software programs
    - CSV data file export
    - Multiple international languages supported 


  • Instantly measure soil moisture, electrical conductivity, and temperature
  • Simply insert the probe into soil and click “Sample” on the screen
  • Optimize soil analysis, watering and fertilization
  • Enables measurement of native (undisturbed) soil
  • Low risk: ten years of field-proven science
  • Performs well in high-salinity soil
  • Easier monitoring of remote sites


  • Works with Apple and Android Products
  • Wireless Wi-Fi communication
  • Instantaneous sensor response
  • Rechargeable AA internal batteries
  • Battery voltage indicator screen
  • No calibration for most soils
  • Custom calibration available for peat, grain, and organic soil
  • Compact & rugged for years of use
  • Email / Export data and view in Excel or other programs for advanced analysis
  • 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 and 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

Ordering Informations

Cat. No Description
93633-002GR Stevens Wi-Fi POGO Portable Soil Sensor, Green
93633-002BL Stevens Wi-Fi POGO Portable Soil Sensor, Black
93633-002RD Stevens Wi-Fi POGO Portable Soil Sensor, Red
93633-002BU Stevens Wi-Fi POGO Portable Soil Sensor, Blue
93633-002CL Stevens Wi-Fi POGO Portable Soil Sensor, finished aluminium

Typical Measurements Range Accuracy
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 soil
From completely dry to fully
> ± 0.03 water fraction by
volume max in typical soil
Conductivity 0.01 to 1.5 S/m  ± 2.0% or 0.005 S/m
whichever is typically
Temperature -10° to +55° C ± 0.1° C
Power Requirements 9.6 - 16 VDC, 7 mA standby current (telemetry system will require additional power)
Processor 16-bit TI MSP430, and two 16-bit dsPIC microprocessors
On-Board Data Storage FLASH storage, 2 Gigabytes internal plus removable 2 Gigabyte SD memory card
Logging Interval 1 minute to 24 hours
Real-Time Clock Accurate +/- 1 minute/month, leap year correction, temperature correction
Non-Volatile Memory
  • All setup parameters and clock, battery backup
  • 8 gigabytes of expandable data storage with external SD card
Message Size 6 - 340 bytes typical
Serial Port
  • One (1) RS-232
  • +/- 5 VDC levels, minimum
  • 1200 to 115200 baud*
  • USB 2.0
Analog to Digital (0-5 VDC)
  • 21-bit resolution
  • Input impedance: 10 K ohm (min)
  • One (1) RS-232
  • USB 2.0 (fully compatible with
  • USB 1.0 devices)
  • Removable SD card, 2 GB supplied
Watchdog Timer System resets upon microprocessor failure
Digital to Analog (0-5 Vdc) Output 12-bit resolution
Temperature and Humidity
  • Operating: -40 to 158 F (-40 to 70 C)
  • Optional NEMA 4 enclosure: 100%
  • condensing
  • Aluminum enclosure: 95%
  • non-condensing
Sensor Input Selections
4 Analog Channels - Single Ended
  • Input type: 2 wire, 4 - 20 mA
  • current loop, or 0 - 5 V with accessable DIP switch
  • Sensor power: 24 Vdc (under firmware control),
  • 12 Vdc and 5 Vdc (fixed)
  • Accuracy & Resolution: 0.01%
  • accuracy, 0.002% resolution
  • 21-bit analog single-ended
  • Input: Resolution is 0.5 parts per million
  • (discrete one for each channel)
  • Simultaneous Sampling
Pulse Count
  • Input type: pulse
  • Sensor power: 5 or 12 VDC continuous
  • Maximum rate: 60 pulses per minute
  • Input type: SDI-12
  • Sensor power: 5 VDC or 12 VDC continuous
One Switched Excitation Voltages: 24V/5W for 4-20mA sensor power