Geotech Mastehead


Water Level & Pressure Equipment

SonTek Acoustic Doppler
Water Velocity Measurement

Geotech is a SonTeck representative in Colorado, New Mexico, Utah, and Wyoming.

FlowTracker Mounted on optional Wading Rod

Mounted on optional Wading Rod

SonTek FlowTracker

Designed with the field user in mind, this handheld ADV®
(Acoustic Doppler Velocimeter) measures currents, attaches easily to wading rods, and features an automatic discharge computation using a variety of international methods, including ISO and USGS standards. At the end of the data run, just press a button and the FlowTracker calculates the discharge for you! With rugged construction for any climate and a backlit display easily read during both day and night, the FlowTracker goes wherever you need it to go.

  • Multi-language instrument and software (English, Spanish, French, Italian, and German)
  • Proven velocity precision - accurate to as low as
    0.001 m/s (0.003 ft/s) and up to 4.0 m/s (13 ft/s)
  • Automatic discharge calculation - International
    techniques, including ISO and USGS standards
  • Record changing gauge heights and rated flows,
    with comments in each measurement
  • Automatic discharge uncertainty calculation to
    ISO standard. A FlowTracker First!
  • Measure velocities in water as shallow as 2 cm
    (less than an 1 inch)
  • Keypad interface with real-time velocity and flow display
  • Automatic quality control for accurate data collection
  • Two dimensional velocity measurement
  • Recorded data is shielded from power loss
  • Lightweight, rugged, and waterproof
  • No calibration required - ever!
  • Built-in temperature sensor

Call 1-800-833-7958

SonTek FlowTracker Specifications

The SonTek Flow Display, with options for 4-20 mA outputs
The SonTek Flow Display,
with options for 4-20 mA outputs


The SonTek-IQ™ starts with a custom flow algorithm derived from hundreds of field measurements. The four velocity beams profile water velocity both vertically and horizontally ensuring complete coverage of the velocity field. The built-in pressure sensor and vertical acoustic beam work in tandem to measure the water level. Simply input the channel geometry using the intuitive SonTek-IQ software and you are outputting flow data in minutes.

  • Easy Installation: User friendly mounting brackets allow for the SonTek-IQ to be installed by simply inserting two bolts
  • Simple Integration: The SonTek-IQ supports communications via RS232, SDI-12 and Modbus.
  • Self contained all-in-one design
  • Proprietary flow algorithms for small irrigation canals
  • Uses SonTek's exclusive SmartPulseHD adaptive sampling
  • Self-calibrating water level using vertical beam and pressure
  • Standard package includes, SonTek-IQ Software, easy mounting hardware, cable, adaptor and power supply

Call 1-800-833-7958

SonTek-IQ Specifications

RiverSurveyor® M9 & S5
RiverSurveyor® M9 & S5

SonTek Hydroboard used as a floatable platform for Riversurveyor systems
SonTek Hydroboard
used as a floatable platform for
Riversurveyor systems

RiverSurveyor® S5 and M9

The RiverSurveyor®, S5/M9 systems give a new perspective to the notion of measuring open channel hydraulics. Using SonTek's exclusive SmartPulseHD™, multiple acoustic frequencies are fused with precise bandwidth control for the most robust and continuous shallow-to-deep discharge measurements ever. A deterministic microcontroller expertly apportions the proper acoustics, pulse scheme, and cell size to get the highest definition possible so you can focus on the measurement, not the instrument setup. The system even has a vertical beam for precise channel definition and it's all designed to work intuitively.

Primary Applications

  • Moving Vessel Discharge
  • Wading Discharge Measurements
  • Irrigation Canals/Natural Streams/Rivers
  • Velocity Indexing
  • Flood Alert
  • Water Supply
  • Pollution Monitoring
  • Tide Studies
  • Flow/Current Field

Call 1-800-833-7958

SonTek RiverSurveyor Specifications

SonTek CastAway-CTD

SonTek CastAway®-CTD

The CastAway-CTD is a lightweight, easy to use instrument designed for quick and accurate conductivity, temperature, and depth profiles. Starting with a unique six-electrode conductivity cell and fast response thermistor the CastAway makes use of modern technology to provide state of the art CTD measurements.

  • 5Hz response and sampling rate
  • Accurate to 0.1 PSU, 0.05°C
  • Internal GPS
  • Bluetooth wireless data download
  • No user calibration required
  • No tools, computers or cables required


  • Coastal Oceanography
  • Hydrology
  • Aquaculture/Fisheries
  • Saltwater Intrusion
  • Surveying/Hydrography
  • Sound Velocity Profiles
  • Field Sensor Verification
  • Estuarine Research

Call 1-800-833-7958

SonTek CastAway-CTD Specifications



The Argonaut-SL is a side-looking Doppler current meter that precisely measures 2-D water velocity in a horizontal layer. Because it is easily installed on a riverbank, bridge abutment, or other vertical structure, it is the perfect choice for long-term current monitoring. Options for water level measurement, water quality, telemetry, and flow calculation extend the capability of the Argonaut SL to a wide variety of applications.

Call 1-800-833-7958

SonTek Argonaut-SL Specifications



Providing robust, laboratory-precision flow measurements in a compact and easy-to use package, the Argonaut-ADV is the ultimate solution to shallow water flow monitoring. Ideal for low-flow applications, it is equally versatile in higher velocity environments and when precise water velocity is needed close to a boundary.

Call 1-800-833-7958

SonTek Argonaut-ADV Specifications



Designed specifically for mounting on the bottom and looking up, the low-profile Argonaut-XR is an advanced Doppler sonar for 3-D water velocity measurement. Because the Argonaut-XR vertically integrates water velocity from the bottom all the way to the surface, it is an ideal tool for sites where bi-directional flows are present. Optional CTDs and multiprobes can make it a complete environmental monitoring solution.

Call 1-800-833-7958

SonTek Argonaut-XR Specifications

Not sure which SonTek/YSI instrument is best for your application?
Go to the Instrument Selection Guide for help in matching your interests.

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2650 East 40th Avenue
Denver, Colorado 80205

Other Locations
North Carolina

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