New Products

EXO1s Multiparameter Sonde

EXO1s Multiparameter Water Quality Batteryless Sonde (4 sensor ports)

Request Pricing

ProSwap Logger

Single-Port Monitoring Sonde

Request Pricing

EXO NitraLED UV Nitrate Sensor

EXO NitraLED UV Nitrate Sensor for Freshwater Environments

Request Pricing

SonTek RS5

Acoustic Doppler Current Profiling System

Request Pricing

ProQuatro Multiparameter Meter

Portable Sampling Handheld Meter for DO, Conductivity, Salinity, TDS, pH, ORP, Ammonium, Nitrate, Chloride, Temperature and more

$1,345.00

One Team on a Mission

Spanning nearly 75 years, YSI, a Xylem brand has a customer-focused legacy of developing innovative, environmentally essential technology. Our customers are more than people who use our instruments - they are climate first responders, environmental stewards, and researchers who are passionate about our world along with scientific integrity.

Learn More About YSI

YSI Vehicles | AUVs | ASVs | Services

Our three vehicle offerings are the rQPOD and HYCAT, autonomous surface vehicles or ASVs, and the EcoMapper, an autonomous underwater vehicle or AUV. YSI has worked with global experts to design vehicle platforms that are rugged yet affordable for environmental monitoring. Our vehicles are optimized for different environments, applications, and can be used for many kinds of surveys, including water quality, water quantity, hydrographic, bathymetric, imaging, scour, and photogrammetry, to name a few.

YSI EXO-S Series Overview

YSI is proud to introduce the EXO-S Series Multiparameter Water Quality Sondes. The EXO-S sondes are shorter, lighter, more affordable, and more sustainable versions of our industry-leading EXO sondes. These sondes are purpose-built without a battery compartment and provide the same sensor payload and best-in-class performance for applications where external power is available.

Industry-Leading Online Ammonium & Nitrate ISE Sensors for Wastewater

Learn why IQ SensorNet’s ion-selective electrode sensors (ISE) are the best choice for continuously monitoring ammonium and nitrate in wastewater. With many innovative features, the YSI VARiON, AmmoLyt, and NitraLyt provide accurate and reliable measurements to monitor and control the activated sludge process.

5 Reasons to Upgrade from Pro Plus to ProQuatro

Since 2006, the Professional Plus has set the industry standard for water quality sampling, but the time has come for us to say farewell and move toward the future. Now, as the field season approaches, we are excited to crown the ProQuatro, YSI’s latest handheld in the Professional Series line, as the new successor to the Pro Plus throne.

Ammonia-Based Aeration Control | Improvements Through Sensor Placement

01/24/2023

A crucial aspect of implementing an ammonia-based aeration control system is ammonium sensor placement. Should the control sensor be near the influent of the activated sludge basins, at the effluent of the activated sludge basins, or...

Keep Reading

Water Blogged 

All Blogs

Featured Products

ProDSS Multiparameter Digital Water Quality Meter

The Ultimate Sampling Handheld. Portable Digital Meter for DO, Conductivity, Salinity, TDS, pH/ORP, Turbidity, Algae, Temperature and more

$1,965.00 - $2,585.00

EXO2 Multiparameter Sonde

Multiparameter Water Quality Sonde for Unattended Monitoring (7 sensor ports, including a central wiper port)

Request Pricing

IQ SensorNet 2020 3G Controller

Modular water quality monitoring system for a complete sensor network that measures up to 20 parameters

Request Pricing

Pontoon Vertical Profiling System

Ideal for Ponds, Lakes, Reservoirs, and Certain Coastal Applications

Request Pricing

ProSolo Digital Water Quality Meter

Portable Optical Dissolved Oxygen, Conductivity, Salinity, and Temperature Digital Handheld Meter

$985.00

2900M Online Monitor & Control System

Two Chemistry Online Monitor & Control System

Request Pricing

MultiLab 4010-3W

Three channel benchtop multiparameter instrument with wireless capability

$2,334.00

HYCAT Autonomous Surface Vehicle

Autonomous Surface Vehicle

Request Pricing

Amazon Bubbler

Self-contained Continuous Flow Bubbler with Fully Integrated Pressure Sensor

Request Pricing

IQ SensorNet Alyza Analyzer PO4

IQ SensorNet Orthophosphate Analyzer

Request Pricing

Determine The HAB Monitoring Solution For You

The intuitive YSI HAB (Harmful Algal Bloom) monitoring system selector will provide you with a recommendation for the HAB monitoring solution that best fits your requirements! Your answers to the selector questions will help you think through your options, and will help YSI to get you a solution as fast as possible. You might even be able to buy your solution online TODAY!

Let's Get Started

LOOKING FOR THE BEST INSTRUMENT?

Finding the right handheld water quality meter should be easy. Just take our short quiz and the intuitive product selector will provide you with an immediate recommendation based on your needs! From the single-parameter, analog Pro10 to the multiparameter, all-digital ProDSS, we've got you covered.

Choose the Right Handheld

What is the Best Titrator for You?

YSI offers a full range of titration solutions to accommodate your titration requirements. Manual or Automated? We can help! Our titrators, and compatible accessories, efficiently determine concentration levels and quickly detect equivalency points accurately.

Start Now

What is The Floating Platform for Your Monitoring Needs?

An Integrated System from YSI can be built for almost any water monitoring application. Reveal water quality in the entire water column with a vertical profiler, configure your own unique data buoy or TurnKey system for real-time data collection.

Find Out Now

LOOKING TO PERFECT YOUR TITRATIONS?

Get back to basics with Xylem's Titration Handbook:  an  all-encompassing guide to help any laboratory navigate one of the oldest quantitative methods in chemical analysis.

Download the Handbook

HOW WATER QUALITY SENSORS WORK | ON-DEMAND WEBINARS

Our experts dive into the evolution of sensor technology and how they work. In this series, we dive into the following parameters in great detail; algae, turbidity, conductivity, pH & ORP, and dissolved oxygen.

Watch the Webinars

HAVE A QUESTION?

Do you have a support question you want to contact us with? Just  fill out our simple form.

Ask a Question