HS2 HydroSense II Display with Carrying Case
Fast and Portable
Soil Water Content Measurements
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported


The HS2 is the handheld display for the new Hydrosense II soil-water sensor. When paired with either the CS658 or CS659 portable soil-water probes, it replaces the previous Hydrosense soil-water system. It features a new handheld display and a new probe design. The HS2 handheld has been designed to be compact and portable, with the layout of the buttons allowing for operation with one hand.

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Benefits and Features

  • Compact and lightweight
  • Read real-time soil-water content measurements in the field
  • Large LCD display for easy operation
  • Onboard data storage for up to 1500 points
  • Onboard GPS for geotagging measurements
  • Bluetooth connection to PC software
  • Export to Google Earth, GPX and CSV
  • Probe redesign for easy insertion and removal from soil



Measurements Made Volumetric water content of porous media (such as soil)
Required Equipment HS2 is a complete system.
Soil Suitability Short rods are easy to install in hard soil. Suitable for soils with higher electrical conductivity.
Rods Replaceable
Sensors Interchangeable sensors; can swap the 12 cm and 20 cm sensors with the reader.

Handheld Display

Display 128 x 64 pixel graphic LCD
Backlight Blue and white LED (brightness-adjustable)
GPS Accuracy
  • ±5 m (16.4 ft) typical
  • ±1 ms time with GPS sync
Bluetooth Range ~10 m (~30 ft)
Data Storage > 1000 records (ring memory)
Zone Storage > 100 records
Power Supply 6 Vdc, 4 AA batteries
Battery Life 6 to 12 months (typical usage)
Dimensions 200 x 100 x 58 mm (7.9 x 3.9 x 2.3 in.)
Weight 340 g (12 oz)

Typical Power Consumption of Display

Sleep 20 µA
Backlight Off 2 mA
Backlight at 60% 18 mA
Backlight at 100% 30 mA
GPS Active 35 mA
Bluetooth Active 30 mA

Probe Options

-NOTE- The CS659 and CS658 cannot share rods.
Water Content Accuracy
  • 3% typical (Accuracy assumes solution EC of < 4 dS/m when using the CS658 20-cm probe.)
  • 3% typical (Accuracy assumes solution EC of < 6.5 dS/m when using the CS659 12-cm probe.)
Volumetric Water Content Resolution < 0.05%
Volumetric Water Content Range 0% to 50% VWC
Cable Type Spiral
Cable Length 250 cm (98 in.) extended
Rod Diameter 5 mm (0.14 in.)
Rod Length
  • 200 mm (7.9 in.) for the CS658 20-cm probe
  • 120 mm (4.7 in.) for the CS659 12-cm probe
Body Dimensions 100 x 92 x 40 mm (3.9 x 3.6 x 1.6 in.)
Weight 450 g (15.9 oz)



The HS2 is the display used in the Hydrosense II System.

Water Content Sensors

The water content sensor is ordered as an option, and may also be purchased separately. Either the CS658 or CS659 can be used with the HS2. The CS658 has 20-cm rods, and the CS659 has 12-cm rods.

Note: The CS658 and CS659 cannot share rods (i.e., 12-cm rods cannot be used with the CS658, and 20-cm rods cannot be used with the CS659).


HS2 OS v.1.07 (519 KB) 01-04-2015

Current HS2 (Hydrosense II) firmware.

View Revision History

HydroSoft v.1.0.8 (5.16 MB) 26-07-2012

Current version of the HydroSense II Support Software.

FAQs for

Number of FAQs related to HS2: 19

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  1. As stated in the "Connecting via Bluetooth" subsection in the "Data Storage and Retrieval" section of the HS2 Instruction Manual: “The first time the HydroSense II unit is used with a new computer, the computer and HydroSense II must be ‘paired’ before a connection can be made. The pairing code is ‘1234.’” For more information, see the "Connect to a Device" subsection of the "Quickstart" section of the HydroSense II Support Software User Guide.

  2. No. The displays and sensors are not interchangeable between the HydroSense and HydroSense II.

  3. Four AA batteries power the HS2. The batteries are user replaceable.
  4. When Deficit Mode is used, a value greater than 100% RWC indicates that the water content is above the wet reference. For more information, see the "Water Deficit Data" subsection in the "Operation" section of the HS2 Instruction Manual.

  5. No. The HS2 uses Bluetooth communication.

  6. Yes. See the "Connecting via Bluetooth" subsection in the "Data Storage and Retrieval" section of the HS2 Instruction Manual.

  7. No. The original HydroSense was not capable of storing data. The HS2 produces a CSV file that can be merged into an existing data file used for HydroSense data. However, the CSV output file from the HS2 will include additional parameters that were not measured by the original HydroSense.

  8. As of April 2014, replacement rods in both 12 cm and 20 cm lengths are still available:

  9. No. The 20 cm rods (pn 18592 or pn 12007) from a CS620 cannot be used with a CS658. The CS658 uses different 20 cm rods (pn 26485 or pn 26483).