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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 Pro20 Lab or Field Dissolved Oxygen Meter

Pro20

Rugged, dissolved oxygen handheld for the laboratory or field.

YSI Professional Plus in the Field Measuring pH and Dissolved Oxygen

Professional Plus

Handheld single, dual or multiparameter meter for measuring dissolved oxygen, pH, ORP, conductivity, and ISEs for field use or lab BODs.

YSI ProOBOD Optical BOD Probe with ProODO in Lab

ProOBOD Self-Stirring Optical BOD Probe

The ProOBOD® self-stirring optical BOD probes are designed to be used with the ProODO instrument.

Latest Video

CastAway-CTD-demonstration-request
News

National Oceanography Centre, Southampton, Awarded New CastAway-CTD

CastAway-CTD award presentation

A brand new CastAway-CTD has been presented to a researcher and academic expert representing the National Oceanography Centre, Southampton, United Kingdom.

Scientists Will Use YSI Portable SeaKeeper to Research Effects of Gulf Oil Spill

Portable SeaKeeper 1000 on boat or research vessel

Aug. 30, 2010 - A scientist from the University of Alabama was awarded funding from the National Science Foundation to purchase a YSI Portable SeaKeeper, an instrument that can be loaded on a research vessel to measure the concentration of hydrocarbons, dissolved oxygen, conductivity and temperature in Mobile Bay.

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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/OBOD

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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