Hydrolab MS5 – Mulitparameter Mini Sonde

Lightweight multi-probe with four ports available for water quality sensors


The Hydrolab MS5 multiparameter water quality sonde offers a selection of Hydrolab sensors on a compact and lightweight multiprobe designed for either profiling or unattended monitoring.  Its compact housing fits into 2” wells or other limited space applications.

  • Attended, Unattended
  • Temperature, Conductivity, Depth, pH ,ORP, Dissolved Oxygen (LDO, Clark cell), Turbidity, Chlorophyll a, Blue-Green Algae, Rhodamine WT, Ammonium, Nitrate, Chloride , TDG
  • The Hydrolab sonde profile for a smaller sensor payload that will fit in a two-inch well
  • SDI-12, RS-485, RS-232, TTY


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.


Hydrolab Standard Methods Sheet
Quick Start Application Software OTT Hydras 3 LT
User Manual Application Software OTT Hydras 3 LT Pocket
USER MANUAL Hydrolab DS5X, DS5, and MS5 Water Quality Multiprobes
Lealflet – Application Software OTT Hydras 3 LT Pocket
Leaflet – Multiparameter-Sonde Water Quality Hydrolab DS5 / DS5X / MS5
Hydras 3 LT – EN
Hydras 3 LT Pocket – EN
Water Quality Solutions Overview Video
Hydrolab Series 5 Firmware
Hydraulic Fracturing Water Analysis App Note
Surveyor Handheld Maintenance
Turbidity White Paper
Turbidity White Paper



ISE Nitrate Sensor for Hydrlab Sondes


Technical Data

Sensors Measures up to 10 parameters simultaneously
Internal 8 AA batteries (with available internal battery pack option)
Communications RS-232, SDI-12, RS-485
Memory Up to 120,000 measurements
User Interface
PC Software Hydras3 LT
Pocket PC Software (Optional) TDS Recon with Hydras 3 LT Pocket
Sonde Depth Rating 200 m (656 ft)
Diameter 4.4 cm (1.75 in.)
Weight 1.0 kg (2.2 lb) (typical)
Weight with battery pack 1.3 kg (2.9 lb) (typical)
Lenght 53.3 cm (21 in.)
Lenght with battery pack 74.9 cm (29.5 in.)
Environmental conditions
Operating temperature -5 … 50 °C (23 … 122 °F), non-freezing

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