YSI | Water Quality Sampling and Monitoring Meters and Instruments for dissolved oxygen, pH, turbidity

Sampling and Monitoring Instruments for Water Quality, Level, and Solutions

New products

IQSN Mobile App and Data Plan

IQSN Mobile Application and Data Plan

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9800 Photometer

Portable, Multiparameter Photometer

$1,700.00

HydroSphere™

A Scalable Data Visualization Platform for Water Monitoring

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ProQuatro Multiparameter Meter

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

$1,441.00

9220 Total Organic Carbon Analyzer

Online TOC Analyzer

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YSI Air Compressors for IQ SensorNet

Single and Multi-Channel Air Compressors for use with IQ SensorNet Sensors

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THM 1000 Selective VOC Analyzer

THM Monitoring System

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EXO2s Multiparameter Sonde

EXO2s Multiparameter Water Quality Batteryless Sonde (7 sensor ports including a central wiper port)

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N-REALYZER

Combustion Analyzer with Starter Kit

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YSIT-1 GOES Radio Satellite Transmitter

GOES Radio Satellite Transmitter

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Real-Time Water Quality Monitoring for Marine Science | SIMS

The Sydney Institute of Marine Science (SIMS) is a collaborative research and training studio that hosts a range of different research projects. Key focuses include habitat restoration, conservation efforts, and mitigating the effects of climate change on oceans and marine species. SIMS utilizes YSI EXO Sondes to monitor real-time water quality and gather continuous, reliable data they can trust.

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 9220 TOC Analzyer | Overview

Introducing the 9220 Total Organic Carbon (TOC) analyzer, developed from over 50 years of experience in measuring TOC for water quality monitoring. Leveraging YSI’s heated persulfate and NDIR technology, the 9220 provides unmatched performance, reliability, versatility, and ease of use.

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.

Water Blogged 

Selective success | How the OI Analytical 5383 PFPD Gas Chromatograph Detector is changing the game in petrochemical analysis

Jakob Woodside | 03/13/2025

Imagine being able to detect a single drop of sulfur in an Olympic-sized swimming pool filled with oil. Sounds impossible, right? There is an instrument available to do...

Keep Reading

Featured products

ProDSS Multiparameter Digital Water Quality Meter

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

$2,126.00 - $2,797.00

EXO2 Multiparameter Sonde

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

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IQ SensorNet 2020 3G Controller

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

$2,650.00

Pontoon Vertical Profiling System

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

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ProSolo Optical Dissolved Oxygen Meter

Portable Optical Dissolved Oxygen, Conductivity, Salinity, and Temperature Meter.

$1,061.00

2900M Online Monitor & Control System

Two Chemistry Online Monitor & Control System

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MultiLab 4010-3W

Three channel benchtop multiparameter instrument with wireless capability

$2,501.00

HYCAT Autonomous Surface Vehicle

Autonomous Surface Vehicle

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Amazon Bubbler

Self-contained Continuous Flow Bubbler with Fully Integrated Pressure Sensor

$4,596.00 - $5,000.00

IQ SensorNet Alyza Analyzer PO4

IQ SensorNet Orthophosphate Analyzer

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More from our team

Mission Water Magazine
Mission: Water Magazine

The Magazine Addressing Global Water Issues

Mission: Water is an annual publication that brings awareness to our most precious resource—water. It serves as a platform to celebrate our customers and other environmental advocates making a difference in our changing world. Download the latest issue today!

Keep Reading >

EXO University
EXO University

On-Demand Training
Practical Tips for Reliable Data

Learn all about EXO Sondes from our team of experts in this free series detailing how to setup, calibrate, maintain, store, and troubleshoot your EXO Sonde. These short, how-to videos are available on-demand so you can go at your own pace and only watch the videos you need.

Get Started >

Training, Events, Webinars
Events, Training & Webinars

Check Out Upcoming Events Training & Webinars

Need training on instrumentation, but can't make it to one of our in-person workshops? Get quick, easy access to on-demand educational resources, earn CEU credit, and enhance your understanding of important topics from our experts.

Learn More >

Water Quality Sonde Selector
Water Quality Sonde Selector

What is the Best Sonde for You?

The intuitive YSI Sonde monitoring system selector will provide you with a recommendation for the multiparameter 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.

Let's Get Started >

Water Quality Meter Selector
Looking for the Best Instrument?

Find the Right Handheld

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 >

Monitoring Buoy Selector
Floating Platform Guide

Monitoring Buoy Selector

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 >

Consult our experts

Environmental Water Monitoring Consulting
Environmental Water Experts

Get Help on Your Next Environmental Project

Our technology experts are available to help with everything from instrument selection to data management. We now offer free virtual consultations for your next water or environmental-related project. Our dedicated application engineers and experts identify the best instrumentation and data collection for your project.

Request a Consultation

Laboratory Consulting
Laboratory Experts

Free Virtual Consultations for Your Laboratory

Our laboratory experts are available to help with everythign from instrument selection to application support for various applications. Xylem Lab Solutions brands are excited to offer free virtual consultations for your next facility project or upgrade. Our dedicated aplications engineers and experts identify the best technology for your application.

Get Advice

Municipal Water Experts
Utility Water Experts

Consult with Our Municipal Water Experts

Our municipal experts are available to help with everything from instrument selection to application support for wastewater and drinking water treatment. the Xylem family of brands now offer free virtual consultations for your next facility project or upgrade. Our dedicated application engineers and experts identify the best system for your needs.

Talk to the Experts