Overview Documentation & Tools


Product Features

5-Port Multiparameter Water Quality Sonde

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.

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

Key Benefits

  • High-accuracy sensors with on-board memory
  • Wireless communications
  • Seamless integration into marine, estuarine, freshwater and ground water monitoring systems

Smart Sondes and Sensors

Extremely versatile instrument, allowing the user to automatically configure a sonde with different sensor for different applications in minutes


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 sensors' 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 antifouling systems protect data integrity
  • Low power consumption extends underwater deploymentt.

But that's just the beginning of the great benefits EXO3 has to offer:

EXO3-Icon-Comm.png The best priced, highest-quality sonde for
baseline water quality monitoring.
EXO3-Icon-Flexible.png Flexibility to switch from continuous monitoring to
spot sampling with a lighter, shorter form factor.
EXO3-Icon-Comm.png Integral SDI-12 communications makes it ideal for existing data collection 
platforms and installations. (Including replacement of 6-Series sondes.)
EXO3-Icon-Swap.png Plug-and-play design with all existing EXO platform smart sensors,
including Total Algae, fDOM, and Wiped Conductivity & Temperature.
EXO3-Icon-Wiper.png The best antifouling wiper in the industry, protecting your 
sensors for up to 90 days in the harshest conditions.
EXO-Factory-Service-Icon (1).png 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!
ISS_Support_Icon (1).png 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_Icon (1).png 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!

SKU: 599503-00 - EXO3 Sonde with no depth sensor
SKU: 599503-01 - EXO3 Sonde with 10m depth sensor
SKU: 599503-02 - EXO3 Sonde with 100m depth sensor
SKU: 599503-03 - EXO3 Sonde with 250m depth sensor


Documentation & Tools

Documentation & Tools