Water Quality



For more specific water quality measurements (Temperature, DO, Conductivity, and pH plus up to two additional sensors), the Hydrolab MS5 offers an optimized selection Hydrolab’s superior sensors on a compact and lightweight multiprobe designed for either profiling or unattended monitoring.

Discontinued item.

Replacement sensors & spare parts still available for sale.



  • Available with Hach LDO Memory included on every sonde RS-485 communications available Improved power management Four built-in expansion ports configured to fit your specific needs Measures up to 10 parameters simultaneously Compact and lightweight 1.75″ diameter housing Used for attended or unattended monitoring


  • Features Hydrolab’s superior sensor technology, the most complete line of sensors available on a multiprobe Engineered for dependable performance and durability in the field Flexible design for use in either profiling or long-term deployments 1.75″ housing fits into 2″ wells or other limited space applications Capable of measurements using any one of the optical probes (i.e., Turbidity, Chlorophyll a, Blue-Green Algae, Rhodamine WT)


Size: Outer diameter – 1.75”/4.4 cm

Length – 21”/53.3 cm

Weight: 2.2 lbs/1.0 kg

(with battery pack) – 2.9 lbs/1.3 kg

Communication Interface: RS-232, SDI-12, RS-485
Memory: Up to 120,000 measurements
Battery Supply: 8 AA batteries (with internal battery pack option)
Operating Temperature: -5 to 50° C
Maximum Depth: 200 m

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