YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde
YSI EXO3 Multiparameter Sonde


YSI EXO3 Multiparameter Sonde


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.

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)
• 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
• EXO1 sonde has 4 ports and a smaller diameter
• EXO2 sonde has 7 ports for the ultimate monitoring platform
• EXO2s sonde offers the same features as the EXO2, but without the 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 is an accessible, feature-rich platform for managing EXO instrumentation and water quality data. Easily calibrate sensors, setup long-term deployments, and ensure equipment is operating at peak performance!


Connectivity / Communications Sonde: Bluetooth wireless technology, RS-485, and integral SDI-12 Output Options with Adapters: USB, RS-232, or Modbus
Depth Rating 0 to 250 m (0 to 820 ft)
Desktop Software Compatible KorEXO
Flow Cell Yes

Fresh, sea or polluted water

Memory 512 MB total memory; >1,000,000 logged readings
Monitoring Yes
Multiparameter Yes
Operating Temperature -5 to 50 °C (23 to 122 °F)
Power 2 Alkaline Batteries
Sampling Yes

Diameter: 7.62 cm (3.00 in)  Length: 58.67 cm (23.1 inc)

Smart Sensors / Ports 5 sensor ports (4 ports available when central wiper in use) Peripheral ports: 1 power communication port
Storage Temperature -20 to 80 °C (-4 to 176 °F). Exception: 0 to 60 °C (32 to 140 °F) for pH and pH/ORP sensors
User Calibratable Yes
Waterproof Yes
Weight 2.00 kg (4.41 lbs) with a full payload of 4 probes, 1 wiper, and probe guard installed

 Inquiry - YSI EXO3 Multiparameter Sonde