Customized Multiparameter Sonde

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.

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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
• 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

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


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
Size 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
Warranty 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