YSI EXO3s Multiparameter Sonde

Multiparameter Water Quality Sonde with 5 sensor ports (including a central wiper port), optional depth sensor, and battery compartment

EXO Multiparameter Sondes — the best-in-class platform for the highest quality data. EXO's dynamic range of smart sensors provide comprehensive multiparameter water quality data while SmartQC ensures proper calibrations and top sensor performance. You can be confident in your extended deployments thanks to EXO's tough materials and unmatched anti-fouling technology.

Instrument Only. Cables, probes/sensors, and accessories sold separately.


The parameters you need, without the features you don't!

Offering the greatest value of any sonde available on the market, EXO3 combines the maneuverability of the EXO1 with the powerful antifouling wiper of the EXO2.

The EXO advanced water quality monitoring platform includes the versatile multiparameter EXO3 sonde for oceanographic, estuarine, or surface water applications.

EXO3 is a purpose-built sonde for monitoring major water quality parameters, including: pH, conductivity, temperature, turbidity, and dissolved oxygen.

Key Benefits

exo multiparameter sonde data datasonde

Highest Data Quality
Onboard monitoring systems verify sensor operation

Multiparameter Monitoring
5 universal ports for allow for any combination of smart sensors or the central wiper

exo anti-fouling antifouling

Industry-leading Anti-fouling
Best-in-class wiper technology

Titanium Components
The toughest grade parts guarantee operation well into the future 

Seamless Integration
EXO can plug-and-play into marine, estuarine, freshwater, and groundwater monitoring systems


Additional Benefits Only from EXO3

Maintenance Special
The best priced, highest-quality sonde for
baseline water quality monitoring.

Flexibility to switch from continuous monitoring to
spot sampling with a lighter, shorter form factor.

YSI Integrated Systems
Integral SDI-12 communications makes it ideal for existing data collection 
platforms and installations. (Including replacement of 6-Series sondes.)


Smart Sondes and Sensors
EXO is an extremely versatile instrument, allowing the user to automatically configure a sonde with different sensors for different applications in minutes

Smart Sensor Options:
• Conductivity/Temperature (wiped and non-wiped)
• Dissolved Oxygen
• fDOM
• ISEs (AmmoniumChloride, and Nitrate)
• pH (guarded and unguarded)
• pH & ORP (guarded and unguarded)
• NitraLED (UV Nitrate)
• Rhodamine
• Total Algae (Chlorophyll + Phycocyanin and Phycoerythrin)
• Turbidity

Other Available Parameters
• Absolute Pressure
• Ammonia
• Depth
• DO% Local
• Guage Pressure
• nLF Conductivity
• Resistivity
• Salinity
• Specific Conductivity
• Total Dissolved Solids
• Total Suspended Solids
• Water Density

EXO sondes and sensors are tested in a variety of rigorous field conditions as well as lab conditions to ensure accuracy and response times.

Monitor without Interruption
No matter which EXO sensors users select, other features of the smart sensor design make them rugged and durable:
• Wet-mateable connectors resist corrosion
• Isolated components prevent short circuits
• Welded housings and double o-rings prevent leaks
• High-impact plastic and titanium resists breaking
• Built-in anti-fouling systems protect data integrity
• Low power consumption extends underwater deployments

Monitoring Made Mobile
EXO makes it easy to view data in the field. The EXO Handheld offers a dedicated, streamlined interface to EXO sondes. EXO GO uses Bluetooth to connect any Windows OS device to a submerged EXO sonde.

Other EXO Sonde Options
• EXO3s Sonde offers the same features as the EXO3, but without the battery compartment
• EXO1 Sonde (4 ports) — also available without battery compartment
• EXO2 Sonde (7 ports including Central Wiper port) — also available without battery compartment

Add an EXO Factory Service Plan to your next sonde purchase and have the peace of mind that your new instrument is covered. Use today’s budget to protect your investment for years to come!


YSI Integrated Systems

The EXO sondes are a key component of a complete, unattended long-term water quality monitoring system from our Integrated Systems & Services group.

EXO University

Learning a new water quality platform can be a challenging process. Accelerate through the learning curve with our on-demand training program. Join us at YSI University!

Kor Software

KorEXO Software makes it easy to manage EXO instrumentation and water quality data. Calibrate sensors, set up long-term deployments, and ensure equipment is operating at peak performance using the traditional Desktop Software or the new Kor Mobile App!


SKU: 577503-00

EXO3s Multiparameter Sonde EXO3s Multiparameter Water Quality Batteryless Sonde (5 sensor ports including a central wiper port): Memory >1,000,000 logged readings, 512 MB total memory
Kor Software

Computer Interface YSIP via USB Signal Output Adapter (SOA) and Bluetooth
Output Options SDI-12 native output; RS-232 & SDI-12 via DCP-SOA; Modbus & RS-485 via Modbus-SOA.
Power Requirement
9 - 16 V

Operating Temperature -5 to 50°C (23 to 122°F)
Storage Temperature -20 to 80°C (-4 to 176°F)
Depth Rating 0 to 250 m (0 to 820’)
Sampling Rate

Up to 4 Hz

Smart Sensor Ports

5 (4 Sensors + 1 Central Wiper)

7.62 cm (3.00”)

Length 42.87 cm (16.88”)
Warranty 3 years

The EXO-S sondes are shorter, lighter, more affordable, and more sustainable versions of our industry-leading EXO sondes. These sondes are purpose-built without a battery compartment and provide the same sensor payload and best-in-class performance for applications where external power is available.

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