YSI manufacture a wide range of Multi-Parameter water quality loggers, for both portable and in-situ applications. YSI instruments are capable of measuring the following parameters: pH, ORP, Conductivity, Temperature, Nitrate, Chloride, Ammonia, Dissolved Oxygen (Optical and Polarographic), Turbidity, Chlorophyll A, Blue-Green Algae, Rhodamine, Hydrocarbons, CDOM, Photosynthetic Active Radiation (PAR), Depth and Vented Level. YSI offer total solutions including real-time data, system integration and customization.

Ysi prosample

Fully automated samplers expand our process monitoring and control equipment offering. Theses lightweight and easy to use samplers come with a proprietary peristaltic pump for highly accurate sampling based on time, flow, or event.

The ProSample series has extremely high volume accuracy to keep your facility in compliance. Commonly used in storm water and storm event sampling, influent and effluent waste water treatment, collection systems for industrial pre-treatment. The ProSampl


YSI Multi-parameter Water Quality Loggers

YSI manufacture a wide range of Multi-Parameter Water Quality Loggers, for both portable and in-situ applications.

YSI AntiFouling Solutions for long term deployments

YSI’s Anti-fouling Kits, designed for 6-Series Sondes, are reliable and affordable ways to significantly lengthen deployment times, reduce operating costs, and ensure high-quality data for continuously deployed monitoring systems.

YSI Hydrocarbon Sensors for 6-Series Sondes

Hydrocarbon monitoring in water is of growing importance near oil platforms, marinas, shipping channels, mines, and oil-spill affected waters.

For oil monitoring and mapping applications, a crude oil sensor with a near UV LED source and a refined fuels sensor with a deep UV LED source are useful. The crude oil sensor can detect oil throughout the water column in offshore monitoring. Closer to shore, where colored dissolved organic matter (CDOM) concentrations can be high and cause interfere with crude oil readings, a refined fuels sensor is recommended.

YSI Portable Handheld Water Quality Instruments

YSI manufacture a comprehensive range of portable single and multi-parameter handheld instruments. Parameters include: pH, ORP, Conductivity, Salinity, TDS, Temperature, Dissolved Oxygen (Optical, Galvanic and Polarographic), Ammonia, Nitrate and Chloride
The new ProODO provides traditional YSI quality in a handheld dissolved oxygen instrument with luminescent optical dissolved oxygen (DO) technology.Features

  • Non-consumptive luminescent method eliminates the need for stirring
  • User-replaceable cables in lengths of 1 to 100-meters
  • Stores 2000 data sets (sensor data, date, time, site and user defined information)
The YSI Pro Plus meter measures combinations of DO, conductivity, specific conductance, salinity, resistivity, TDS, pH, ORP, ammonium, nitrate, chloride and temperature. Features

  • 5,000 data-set memory
  • Waterproof, impact resistant case with back-lit display and keypad
  • 3 year warranty on multi-parameter display
The YSI Model 556 simultaneously measures numerous water quality parameters including temperature, conductivity, salinity, dissolved oxygen, pH, and ORP.Features

  • 1.5 MB memory stores over 49,000 time & date stamped data sets
  • Waterproof, impact resistant case with large, backlit digital display
  • 3 year warranty on multi-parameter display

EcoSense pH10AEcoSense ODO200

YSI ecosense    

YSI’s EcoSense product line of compact, handheld instruments include economical water quality instruments measuring pH, ORP, Dissolved Oxygen, Optical Dissolved Oxygen and Conductivity/Temperature.

YSI Portable Photometer

The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters.

YSI-900-Chlorine-Colorimeter low resYSI-pHotoFlex-pH-with-sensor low res

YSI PORTABLE colorimeter    

YSI provide single and multi perimeter colorimeters, thermal reactors, and a complete line of reagents for water analysis.  Two single-parameter colorimeters are available for free and total chlorine and COD.  The multi-parameter pHotoFlex is offered in two models, one for 85+ parameters, and the other for 135 parameters and a connection for a pH probe.

YSI Portable CTD Instrument with GPS

The YSI CastAway™ CTD is the world’s first handheld castable instrument that provides instantaneous profiles of temperature, salinity, and sound speed. Oceanographers, hydrologists, and surveyors now have the ability to quickly collect reliable data from any dock, bridge, or boat.

We provide natural resources monitoring solutions to governments, universities, and private organizations. YSI Integrated Systems and Services goes beyond equipment sales to providing you with complete solutions including installation services, training, design, engineering, maintenance, construction, and complete project delivery. Our services offering has grown to over 14 direct offices around the world providing local support on global monitoring projects.
Automated Pontoon water quality profiler for lakes, reservoirs and coastal areas

Featuring a submersible, watertight enclosure and a rugged non-corrosive mechanical winch and drive mechanism, the 6951 provides fully-automated data collection from a pontoon float.

YSI Fixed Profiler

Automated Fixed water quality profiler from dam, pier or piling
Mountable on a dam, pier, piling, or other stationary location, the 6950 offers user-programmable sample intervals with wireless transmission options.
The YSI 6950 is compatible will all YSI 6-Series sondes equipped with depth, and comes with Profile Wizard software for easy set-up and deployment.

YSI EcoMapper AUV

Collect high-resolution data without getting your feet wet. The EcoMapper is a unique AUV (autonomous underwater vehicle) designed specifically for mapping water quality, water currents and bathymetry.


Monitoring and Control Laboratories