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Hydrolab - water quality monitoring

HYDROLAB water quality instruments and software help environmental scientists and managers monitor important changes in watersheds by providing continuous, trusted water quality data.

Since we introduced the industry’s first multiparameter water quality probe for field use in 1968, we have consistently produced high-performing instruments and software solutions designed for real-world functionality.

Today, HYDROLAB products are created for accuracy, usability, and ease of use. Our sensor designs provide long-term, continuous monitoring, portable, flexible spot monitoring, and short-term study support.

HYDROLAB sondes are known for sensor diagnostics and comprehensive metadata information to provide traceability on valuable data. Users can reduce the risk of errors with calibration history and safeguard field measurements with smarter verification methods.

Easy-to-use software tools support decision making, minimize errors, and increase efficiency by streamlining data collection and calibration tasks in the lab or at deployment locations.


The HYDROLAB HL7 multiparameter sonde offers a versatile, durable and practical solution to the day to day needs of monitoring programs for both simple and complex deployments. The HL7 sonde with a large sensor suite is able to thrive in demanding environmental conditions for long term continuous monitoring. Bio-fouling is minimized when equipped with the central cleaning brush and performance is maximized with an advanced power management system.

The HL7 sonde has a temperature sensor, seven external sensor ports and an optional internal depth sensor. It helps environmental scientists to correctly log data autonomously and easily integrate into real time telemetry systems. The HYDROLAB Operating Software streamlines data collection and calibration tasks necessary to validate accurate data. Calibration logs and metadata are also available to help with QA/ QC requirements.


Peace of mind

Ready to use for long deployments with a self-monitoring system that reports the status of the instrument. The antifouling sensor cleaning brush significantly extends field use and decreases bio fouling.

Field proven sensor measurement technology for data continuity

Durable sensor suite helps maintain a cost-effective water quality monitor, and the long-term stability and accuracy is achieved with the central wiper and brush. The serviceable pH reference sensor helps reduce maintenance costs over time.

Traceability of measurements to boost confidence in results

Includes guided calibration routines which increase efficiencies, and safeguard field measurements with smarter verification methods. The sensor’s diagnostics and metadata information also validate measurements, and there is a reduced risk of errors with calibration history information.


Designed to withstand the heavy everyday use of demanding field deployments and has a typical battery life capable of greater than 90 days deployment to help ensure maximum performance.


Five optical sensor ports offer greater sensor choice for different monitoring applications.


The HYDROLAB HL4 is perfectly suited for spot monitoring or continuous deployments in a wide range of freshwater applications. Lightweight, portable and flexible, this multi-parameter sonde helps you quickly monitor watershed conditions. The field proven sensor options coupled with the robust construction and easy calibration delivers high quality reliable data. The HL4 sonde has a temperature sensor, four sensor ports and an optional internal depth sensor. The software allows for easy data retrieval and setup of logging files.


Ease of portability between sites and installation

The sonde’s lightweight and compact design readily accesses difficult locations and fits inside protective housing -2” wells. Its durable design provides long term usage for a variety of applications.

Perfect for spot monitoring and short-term monitoring studies

Includes an internal memory of 4GB for logging data plus an optional internal battery pack, and flexible for many applications.

Easy to use instrument management and control software

Has guided calibration tasks and instructions, plus real time measurements in graphical and tabular formats.



The Surveyor HL is a compact rugged handheld display for real time data viewing, storage, calibration and configuration of sondes. The color screen is visible in direct sunlight and a keypad with pronounced buttons aids system navigation. The Surveyor HL is powered by a rechargeable lithium-ion battery that holds enough energy to power a HYDROLAB HL4 for 10 continuous hours.


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