EXO2s Customized Multiparameter Sonde

EXO Multiparameter Sondes

EXO advanced water quality monitoring platform for continuous field water quality measurements in challenging conditions.

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Customized Multiparameter Water Quality Sonde with 7 sensor ports (including a central wiper port), optional depth sensor, no 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.

This is the EXO2s conversion service only.
EXO2 sonde, cables, probes/sensors, and accessories sold separately.

  • Overview

    Go more places with the EXO2s sonde!

    The more maneuverable monitoring platform.

    We have heard from customers who need the payload and capabilities of YSI’s best-in-class EXO2 sonde, but in spaces and places that can’t accommodate the EXO2. EXO2s is a customized, batteryless sonde that comes with the same warranty and capabilities as the EXO2, and is ideal for specialized applications such as:

    • Attachment to an AUV or aerial drone
    • Integration with a buoy
    • Horizontal profiling where light weight is optimal

    Key Benefits

    exo multiparameter sonde data datasonde

    Highest Data Quality
    Onboard monitoring systems verify sensor operation

    Multiparameter Monitoring
    7 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

    Discover how less size can bring more value
    to your science with the following benefits:

    Maintenance Special
    Take off the strain, with a
    30% reduction in weight.

     YSI Integrated Systems
    Go new places, with a
    33% reduction in length.​

    YSI Integrated Systems
    Explore your environment,
    with AUV's or drones.

    EXO University
    Expand your integrated system,
    and maximize your limited space.

    EXO University
    Lose the Alkalines,
    and save on maintenance.

    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
    • ISEs (Ammonium, Chloride, and Nitrate)
    • pH (guarded and unguarded)
    • pH & ORP (guarded and unguarded)
    • Total Algae (Chlorophyll + Phycocyanin and Phycoerythrin)

    Other Available Parameters
    • Absolute Pressure
    • Ammonia
    • Depth
    • DO% Local
    • Guage Pressure
    • nLF Conductivity
    • PAR
    • 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

    Other EXO Sonde Options
    • EXO1 sonde has 4 ports and a smaller diameter
    EXO2 sonde has 7 ports for the ultimate monitoring platform  
    • EXO3 sonde has 5 ports for a lower cost option using the central wiper


    EXO-Factory-Service-Icon.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!

    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!

  • Specifications
    Connectivity / Communications Computer Interface: Bluetooth wireless technology, RS-485, USB. Output Options with Adapters: USB; RS-232 & SDI-12; Modbus
    Depth / Pressure Rating / Limit 0 to 250 m (0 to 820 ft)
    Memory 512 MB total memory; >1,000,000 logged readings
    Monitoring Yes
    Operating Temperature -5 to 50 °C (23 to 122 °F)
    Power No batteries. Must be powered by external source.
    Sampling Yes

    Diameter: 7.62 cm (3.00 in)
    Length: 47.00 cm (18.5 in)

    Smart Sensors / Ports 7 sensor ports (6 ports available when central wiper in use). Peripheral ports: 1 power communication port; 1 auxiliary expansion 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

    2 Years: Cables; sonde bulkheads; handheld; conductivity, temperature, depth, and optical sensors; electronics base for pH, pH/ORP, ammonium, chloride, and nitrate sensors; and accessories

    1 Year: Optical DO membranes and replaceable reagent modules for pH and pH/ORP

    3 Months: Replaceable reagent modules for ammonium, chloride, and nitrate

    Waterproof Yes
    Weight 1.60 kg (3.53 lbs) with a full payload of 5 probes, 1 wiper, and probe guard installed
  • Video

    EXO-University.com | On-demand Sonde Training

    Learning a new water quality platform can be a challenging process. Accelerate through the learning curve with EXO University!

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Wireless communication device for the EXO sondes.

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EXO Flying Lead Cable

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EXO Central Wiper

Anti-fouling Wiper for the EXO2 and EXO3 Platforms

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