6920 V2 Compact Data Sonde for Unattended Monitoring   The YSI 6920 V2 sonde is an economical water quality logging system, ideal for long-term in situ monitoring and profiling. Real-time turbidity monitoring, dissolved oxygen monitoring, algae monitoring, and more.
		5200A Multiparameter Monitoring and Control Instrument   Designed specifically for Aquaculture Systems, the YSI 5200 and AquaManager™ Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen, pH, conductivity, ORP, salinity and temperature.
		5400 MultiDO Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5400 and AquaManager® Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen in multiple tanks or ponds.
		Professional Plus Handheld Multiparameter Instrument   The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.
		ProODO Handheld Optical Dissolved Oxygen (D0) Meter "We are very pleased with the convenience, usability, and ruggedness of the ProODO; and highly recommend it to anyone needing to monitor dissolved oxygen."   The YSI ProODOTM handheld dissolved oxygen meter provides extreme durability for measuring DO with optical, luminescent based technology for field or lab.
		Pro20 Lab / Field Dissolved Oxygen   The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design.
		Pro2030 Field Dissolved Oxygen / Conductivity "YSI did a great job on this design.  Our staff of about 20 people consists of old veterans to recent college grads, and not one so far has had a negative comment." The Pro2030 provides everything you need in a handheld dissolved oxygen meter that automatically compensates for changes in salinity values. Rugged, simple and reliable. Measure DO, salinity, conductivity, specific conductance, TDS, barometric pressure and temperature.
		556MPS Handheld Multiparameter Instrument   Rugged, reliable and waterproof, the YSI 556 MPS (Multiprobe System) combines the versatility of an easy-to-use, easy-to-read handheld unit with all the functionality of a multiparameter system.
		55 Field-proven, a true classic Dissolved Oxygen Meter The YSI 55 dissolved oxygen meter measures dissolved oxygen in mg/L or percent saturation.
		5500D MultiDO Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5500D and AquaManager® Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen with optcial technology in multiple tanks or ponds.
		pH10A Pen-style pH Tester Instrument The pH10A is part of the EcoSense® family of products. It's the perfect instrument for economical spot sampling of pH and temperature in many applications including wastwater, surface water, aquaculture, hydroponics, pools, and education.
		ORP15A Pen-Style ORP Instrument   The ORP15A is part of the EcoSense® family of products. The ORP15A offers accurate, low-cost measurement of ORP (absolute and relative) along with temperature.
		DO200A Dissolved Oxygen Meter   The DO200A is part of the EcoSense® family of products. The DO200A dissolved oxygen instrument offers fast dissolved oxygen response times in wastewater, surface water, and aquaculture applications.
		EC300A Handheld Conductivity Meter   The EC300A handheld conductivity instrument is part of the EcoSense® family of products. The EC300A offers convenient conductivity, specific conductance, salinity, total dissolved solids, and temperature with a super-stable, four-electrode conductivity cell for true field applications.
		pH100A Handheld pH or mV Meter   YSI's EcoSense® product line of compact, handheld instruments includes the pH100A pH meter. For simple, one handed operation for pH readings or mV values and temperature the pH100A is a logical choice.
		9300 / 9500 Photometer Waterproof, rugged, easy to use photometers   The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters.
		900 Chlorine Colorimeter Waterproof, accurate, easy to use colorimeter The YSI 900 Free and Total chlorine colorimeter is ideal for any application. This portable instrument allows you to easily take readings directly in the field or lab.
		pHotoFlex Colorimeters The pHotoFlex line of colorimeters is the newest addition to YSI's full range of colorimeters. These rugged, waterproof, multiparameter colorimeters are ideal for laboratory and field testing.
		IQ SensorNet 2020 XT Improve Operational Efficiency with Continuous Data With an easily scalable solution, the 2020 XT allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately. "We haven't had any issues and are very happy with it. Installation and setup are very user friendly."
		IQ SensorNet 182 Models Improve Operational Efficiency with Continuous Data With an easily scalable solution the 182, 182 XT, and 182 XT-4 allow for the connection of 1-4 sensors depending on which terminal you choose. Add sensors at any time and at any location or change them out with ease. This completely modular plug-and-play system allows you to monitor the water quality in your wastewater or aquaculture system continuously and accurately.

Catalogs & Brochures

Water Quality Sampling for Field and Laboratory

Aquaculture Applications, Capabilities & Solutions

Español - Piscicultura Aplicaciones, Competencia y Soluciones

Aquaculture Monitoring & Control

CastAway Brochure

Application Notes

Dissolved Oxygen Monitoring and Control in Shrimp Production with the YSI 5500D

Oyster Restoration Efforts in Delaware Bay - Water Quality

Chronic Exposure Effects to Rainbow Trout from Nitrate Nitrogen

Understanding Ammonia in Aquaculture Pond Systems

Pacific White Shrimp Production in a Super-Intensive Raceway System

ECSI Manages Habitat in High Hydrogen Sulfide Environments with Optical DO

Super-Intensive Shrimp System Provides A Look Into The Future

Delaware Oyster Gardening and Restoration - A Cooperative Effort

High-Intensity Raceway Production Could Put Catfish Producers in the Fast Lane

Dissolved Oxygen Management and Related Costs in Pond Aquaculture

Español - Gestión del Oxígeno Disuelto y costes relacionados en estanques de piscicultura

Considerations for Sea Cage Aquaculture in Marine Environments

Managing and Protecting Remote Source Water for the East Bay Area

Handheld Professional Plus Instrument Saves Time Measuring Ammonia in Aquaculture Ponds

Español - El portátil Professional Plus ahorra tiempo cuando no hay tiempo que perder

Automation Streamlines High-Tech Shrimp Facility

Español - Automatización de alta tecnología lleva a la camaronicultura al siguente nivel

Project Wadi Fish Attempts to Save Rare Freshwater Species

Monitoring Network Protects International Aquaculture Investment Zones

Español - Red de monitoreo protege inversions en acuicultura en Chile

The Newport Aquarium’s WAVE Foundation Uses YSI Instruments to Support Project Piaba

Renowned Newport Aquarium Uses YSI Instruments to Maintain Water Quality

Monitoring Recirculation Systems at Harbor Branch Oceanographic Institute with the YSI 5200

YSI DO200 Assists Roland Martin in Determining Fishing Locations