Manufacturer: Sontek
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Designed with the field user in mind, the FlowTracker Handheld-ADV® (Acoustic Doppler Velocimeter) measures 2D or 3D currents, attaches easily to wading rods, and features an automatic discharge computation using a variety of international methods, including ISO and USGS standards. The FlowTracker also features SonTek’s exclusive "SmartQC" which involves a series of built-in data quality checks, so you know your data is right. At the end of the data run, just press a button and the FlowTracker calculates the discharge for you.

The FlowTracker provides unparalleled benefits you will only find with SonTek/YSI systems.   It is the ideal wading discharge solution if you're looking for:

  • Unmatched performance in shallow water and low flows
  • Help in challenging outdoor conditions
  • Built-in quality checks (SmartQC) so you know your data is right!
  • A way to avoid recurring calibration/maintenance
  • Tough equipment that doesn't break down all the time
  • An easy-to-use interface
  • Fewer steps to follow

Standard Features

  • Multi-language instrument and software (English, Spanish, French, Italian, and German)
  • Proven velocity accuracy to as low as 0.001m/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 or three dimensional velocity measurement
  • Recorded data is shielded from power loss
  • Lightweight, rugged, and waterproof
  • No calibration required - ever!
  • Built-in temperature sensor

Optional Features

  • 2-D/3-D ADV side-looking probe
  • 5m flexible cable
  • Deluxe SonTek two piece, top-setting wading rod kit (1.2 m or 4 ft) including case and mounting brackets
  • Wading rod mounting bracket for controller/keypad
  • Offset mounting bracket for ADV probe
  • 2.4m metric rod


  • Range: ±0.001 to 4.0 m/s (0.003 to 13 ft/s)
  • Resolution: 0.0001 m/s (0.0003 ft/s)


  • ±1% of measured velocity, ±0.25 cm/s

Sampling Volume Location

  • 10 cm from center transducer

Communication Protocol

  • RS-2332

Power Supply

  • 8 AA Alkaline batteries (25+ hours of continuous operation)


  • 1.8 kg (4.0 lbs)

Probe Width

  • 130 mm (5.1 in)

LCD/Keypad Unit

  • Temporarily submersible to 1 m (3 ft)

Operating/Storage Temperature

  • -20º to 50º C