YSI Incorporated
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Welcome to YSI.com

YSI is a developer and manufacturer of sensors, instruments, software, and data collection platforms for environmental water quality monitoring and testing. Reaching beyond our products, we build relationships with our customers through our dedicated customer service, including technical applications and service support.

Featured Products
YSI CastAway CTD, front and back views with skin.

CastAway™ CTD

CastAway CTD is the first handheld castable instrument that provides instantaneous profiles of temperature, salinity, and sound speed.

YSI Buoy-Based Vertical Profiling System

Vertical Profilers

For source water and reservoir monitoring, YSI Vertical Profiling Systems provide automated data collection throughout a water column.

YSI 6850 Flow Cell for the Pro Series Quatro Cable

6850 Quatro Cable Flow Cell

YSI offers a full-range of flow cells for both sondes and handhelds.

Latest Video

YSI Webinar: How to Collect High-Quality Water Monitoring Data in the Field
News

YSI Responds to Oil Spill Disaster with 5 Monitoring Systems You Can Use

In response to the Deepwater Horizon accident, YSI offers several comprehensive real-time monitoring systems for quick response and mapping.

Make the most of your monitoring efforts with durable fixed and floating systems that provide real-time crude oil, water quality, and meteorological data in near-coastal environments.

SeaKeeper with Crude Oil Sensor Responds to Gulf Oil Spill

In response to the Deepwater Horizon oil spill crisis in the Gulf of Mexico, YSI Inc., in cooperation with the International SeaKeepers Society and the University of South Florida, has integrated a C3 Hydrocarbon sensor from Turner Designs into the SeaKeeper 1000 oceanographic and atmospheric data acquisition system. With the well-established C3 sensor, the SeaKeeper 1000 unit is now capable of mapping the dilute hydrocarbon (oil) plumes and the extent of the oil spread.

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We Know DO Resources

What is the True Cost of Your Data?

Webinars

YSI Product Recycling Program

Manuals, Specs, Catalogs, MSDSs...

All Product Accessories


Other YSI Divisions

YSI Life Sciences

SonTek/YSI

YSI Systems

AMJ Environmental

Design Analysis Associates

YSI Hydrodata (UK)

YSI China

YSI/Nanotech (Japan)

YSI Australia

6-Series

Multiparameter Sondes

6600 V2

6600EDS V2

6920 V2

6820 V2

600OMS V2

600XL V2 / 600XLM V2

600XL / 600XLM

600QS

600R

600LS

600DW

6920DW

650MDS

6500 Process Monitor

Anti-Fouling Solutions

6-Series Software

EcoWatch

AQUARIUS Time-Series

Streamline-ENV

All YSI Product Accesories - Sensors, Cables, Calibration Solutions & more...

Most Common

Ammonia/Ammonium

Blue-Green Algae

BOD (Biochemical Oxygen Demand)

Chloride

Chlorophyll

Conductivity

Depth

Dissolved Oxygen

Free Chlorine

Level

Nitrate

ORP / Redox

Photosynthetic Active Radiation (PAR)

pH

Resistivity

Rhodamine

Salinity

Specific Conductance

Temperature

Total Dissolved Solids (TDS)

Turbidity

Photometer Parameters

Professional Series

Handheld Instruments

Professional Plus
Multiparameter

ProODO Optical DO

Pro20 Lab/Field DO

 

Classic Handheld Series

556MPS Multiparameter

550A Dissolved Oxygen

85 DO/Conductivity

63 pH/Conductivity

60 pH

52/58 Lab/Field DO

55 Dissolved Oxygen

30 Conductivity

Level Scout

Level Scout Level & Temp

 

Laboratory Series

5000/5100 BOD/DO

3200 Conductivity

3100 Conductivity

 

EcoSense

pH10 - pH Pen

pH100 - pH

ORP15 - ORP Pen

DO200 - DO

EC300 - Conductivity

9300/9500 Photometer

 

Aquaculture Systems

5200

YSI Systems

CastAway CTD

Buoys & Floating Platforms

EcoMapper AUV

EcoNet Data-to-Web

Vertical Profiling

Towed Underwater Vehicles

Underway Sampling System

Systems Integration

Other YSI Products

SonTek Acoustic Doppler Systems for water velocity

AMJ Environmental Custom Services

Design Analysis Associates WaterLog Series

YSI Life Sciences

Aquaculture

Coastal

Desalination

Estuary

Drinking Water

Groundwater

Laboratory

Oceans

Raw Water

Source Water

Storm Water

Surface Water

Wastewater

Watersheds / TMDL

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The YSI Foundation

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YSI Incorporated | 1700/1725 Brannum Lane | Yellow Springs, OH 45387 USA
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