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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.

Compact and lightweight multiprobe designed for either profiling or unattended monitoring


Compact and lightweight multiprobe designed for either profiling or unattended monitoring


  • Four universal sensor ports that allow custom configuration
  • Measures up to 10 parameters simultaneously (Some sensors provide multiple parameters)
  • Compact and lightweight 1.75” diameter housing fits into 2” wells or other limited space applications
  • Flexible design for use in either profiling or long-term deployments
  • Capable of measurements using Hach LDO and an additional optical probe.


SensorsMeasures up to 10 parameters simultaneously
Internal8 AA 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)
Diameter4.4 cm (1.75 in.)
Weight1.0 kg (2.2 lb) (typical)
Weight with battery pack1.3 kg (2.9 lb) (typical)
Lenght53.3 cm (21 in.)
Lenght with battery pack74.9 cm (29.5 in.)
Environmental conditions
Operating temperature-5 ... 50 °C (23 ... 122 °F), non-freezing


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