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

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What Does YSI Systems and Services Mean?

12/08/16

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...

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The Dissolved Oxygen Meter You Need at the Price You Want | YSI Pro20i

12/05/16

This newest addition to the Professional Series family of rugged handhelds, the YSI Pro20i, features an integral (non-detachable) cable, making it the perfect replacement for the YSI 55 and 550A at a price point that is lower than other Professional Series instruments...

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Welcome to YSI.com

YSI has served the environmental, water quality and Life Sciences markets for over 65 years. The website 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.