Water Blogged 

Water Quality Meter Plus Smart Sensors Equals Ultimate Handheld


The new YSI ProDSS Digital Sampling System. The YSI ProDSS is the most advanced handheld instrument available for water quality spot sampling and profiling studies. The ProDSS is designed to simplify field work. It's a portable water quality multiparameter...

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Flow Monitoring Helps Officials at Three Gorges Dam


Among the lush plane of Southeastern China, spanning the Yangtze River, stands the world’s largest hydroelectric Dam – The Three Gorges. Today, Chinese officials are now facing environmental repercussions and staking the future water supply for surrounding...

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YSI Amazon Bubbler Teaser April 5

pH Handbook on Homepage Download

Free Assorted Case of pH Buffer (603824) with purchase of any MultiLab or TruLab instrument!

Welcome to YSI.com

YSI has served the environmental, water quality and Life Sciences markets for over 65 years. The new web site was designed for you - to help you learn, review and quickly find the products and information you need to perform your job.

Buy Online
In order to provide a convenient experience we now have online buying for many of our products to the US audience. If a product is available for purchase there will be an 'Add to Cart' button on the product page. YSI products are also available through our distribution partners. To locate a distributor please visit the 'Find a Distributor' page.

Request Pricing 
All of our product pages will have an option for you to request pricing. By simply clicking the button, or link, and providing some information, we will have one of our knowledgeable YSIers provide assistance and pricing.  We encourage you to provide your feedback at feedback@ysi.com