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HYDROLAB is a leading US manufacturer that introduced the first Multi-Parameter Sonde to the world in 1968. For more than 45 years, Hydrolab has designed and manufactured multi-parameter sondes for water quality monitoring in the environment. Hydrolab is now part of the Hach Hydromet and OTT Hydromet family.

At the heart of Hydrolab multi-probes is our superior sensor technology, which ensures that the important data you collect is solid, reliable, and dependable. In addition, our sensors are built to last, and comes packaged in a rugged, non-corrosivehousing so your total cost of ownership is ultimately the lowest in the industry.

Multiparameter platform especially designed for longterm unattended monitoring


Multiparameter platform especially designed for longterm unattended monitoring


  • Seven universal sensor ports that allow custom configuration
  • Measures up to 16 parameters simultaneously (Some sensors provide multiple parameters) Capable of measurements using any of Hydrolab’s 17 sensors
  • Optimized for long-term, unattended deployments
  • Central cleaning system wipes away fouling from DO, pH, ISE's, Chlorophyll, Blue-Green Algae, Rhodamine, and Turbidity sensors
  • Ideal for 'X-tended' deployments in environments where fouling and sediment are abundant
  • Improves long-term value by reducing the frequency of sensor maintenance
  • A single central motor cleans the entire suite of sensors, thereby minimizing power consumption
  • Brush design features robust fibers that won't separate over time


SensorsMeasures up to 16 parameters simultaneously
Capable of measurements using any of Hydrolab's 17 sensors
Internal8 C batteries (with available internal battery pack option)
CommunicationsRS-232, SDI-12, RS-485
MemoryUp to 120,000 measurements
User Interface
PC SoftwareHydras3 LT
Pocket PC Software(Optional) TDS Recon with Hydras 3 LT Pocket
Sonde Depth Rating200 m (656 ft)
Diameter8.9 cm (3.5 in.)
Weight3.35 kg (7.4 lb) (typical)
Lenght51.43 cm (23 in.)
Environmental conditions
Operating temperature-5 ... 50 °C (23 ... 122 °F), non-freezing


  • Temperature
  • Conductivity
  • Depth
  • pH
  • Oxygen Reduction Potential (ORP)
  • Dissolved Oxygen (LDO)
  • Dissolved Oxygen (Clark Cell)
  • Turbidity, Chlorophyll a
  • Blue-Green Algae
  • Rhodamine WT
  • Ammonium
  • Nitrate
  • Chloride
  • Total Dissolved Gas (TDG)
  • Ambient Light

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