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An evolution of the Professional Series water quality meters, the ProSolo DIGITAL handheld replaces the ProODO as YSI’s most advanced optical dissolved oxygen field meter. Paired with the ProDIGITAL ODO/CT (Optical Dissolved Oxygen, Conductivity, and Temperature) probe, the ProSolo is perfect for measuring DO in aquaculture, coastal, estuary, wetland, or any application requiring accurate, real-time salinity-compensated DO measurements.

ODO® Sensor Technology

Dissolved oxygen measurement technology has advanced from electrochemical sensors, such as polarographic and galvanic, to luminescent-based, optical sensors. YSI optical DO sensors are non-consumptive, meaning oxygen is not consumed during the measurement. As a result, there is no flow dependence or stirring required with ODO, allowing for the most accurate readings in the field.

Advantages over electrochemical sensors include:

  • Higher accuracy with no stir dependence
  • Less drift over time; holds calibration longer
  • Less maintenance; no membranes or electrolyte

Real-Time Salinity Compensation

With an integral conductivity module, the ODO/CT probe assembly enables the ProSolo to automatically compensate DO mg/L measurements for changes in salinity. The 4-electrode conductivity cell, designed for rugged field performance, is easily cleaned and requires minimal maintenance.

ProDIGITAL Smart Sensors

In addition to utilizing the most advanced DO sensing technology, the ProSolo incorporates smart sensor technology that enables sensors to be automatically recognized by the handheld. Additionally, DIGITAL sensors store calibration data, so probe assemblies can be swapped between handhelds without the need for re-calibration.

Provides Years of Sampling for All Field Conditions

The ProSolo handheld meets the demands of true field work with a rugged, waterproof case (IP-67 rated) and a military-spec (MS) cable connector. Rigorously drop tested from all angles, the handheld features a 3-year warranty, while a 2-year warranty is included with the probe assembly and ODO Cap.

Advanced Data Management

ProSolo includes KorDSS Software, a powerful data management program for easy 2-way communication between the meter and a PC. A unique data backup feature allows for the export of data to a USB flash drive (included) in csv format without having to connect to a computer.

Convenient Sampling Experience

  • Ergonomic handheld for a comfortable grip
  • Easy-to-read color display and backlit keypad
  • Large onboard memory with storage capacity for over 100,000 data sets
  • Site ID and Data ID tag capabilities for data organization
  • Data export directly to USB flash drive (included)
  • Single cable design for probe assembly lengths ranging from 1- to 100-meters
  • Long-life rechargeable lithium-ion battery that is user-replaceable
  • Simple and quick calibration procedures
Dimensions 8.3 cm width x 21.6 cm length x 5.6 cm depth; 567 g (with battery)

Rechargeable lithium-ion battery pack provides ~48 hours with the handheld only;

Battery recharge time is ~ 9 hours with the AC power adapter;

The instrument can also be powered via AC or external power through the USB port

Operating Temperature 0 to 50°C
Storage Temperature

0 to 45°C with battery installed;

0 to 60°C without battery installed


Color, LCD graphic display;

3.9 cm width x 6.5 cm height

Memory >100,000 data sets


Units: mmHg, inHg, mbar, psi,
kPa, atm

Range: 375 to 825 mmHg;

Accuracy: ±1.5 mmHg from 0 to 50°C;

Resolution: 0.1 mmHg;

Sites and Data ID

100 user-defined sites and 100 user-defined data ID tags;

Site pictures can be sent to the handheld via KorDSS Software

Calibration Records 400 detailed calibration records can be stored and are available to view, download, and print (printing only available via KorDSS Software)
Languages English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese,
Chinese (Simplified & Traditional), Korean, Thai
Certifications CEC, CE; RoHS; IP-67; WEEE; FCC; UN Part III, Section 38.3, Test methods for lithium-ion batteries (Class 9)
Warranty NMEA 0183; requires user-supplied GPS and YSI 6115 Y-cable
ODO/CT Specifications  
Size 2.46 cm diameter, cable options for 1, 4, 10, 20, 30, 50, and 100 m lengths

Dissolved Oxygen

(Optical luminescence)
Units: % saturation, % saturation
local, mg/L, ppm

Range: 0 to 500%, 0 to 50 mg/L

Accuracy: 0 to 200%: ±1% of reading or 1% saturation, whichever is greater

200 to 500%: ±8% of reading

0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater

20 to 50 mg/L: ±8% of reading

Resolution: 0.01 mg/L and 0.1%, or 0.1 mg/L and 1% (auto-adjusts based on range)


Units: °C, °F, K

Range: -5 to 70°C (temperature compensation range for DO mg/L measurement: -5 to 50°C )

Accuracy: ±0.2°C

Resolution: 0.1°C or 0.1°F (auto-adjusts based on range)


(Four nickel electrode cell)
Units: μS/cm, mS/cm

Range: 0 to 200 mS/cm

Accuracy: 0 to 100 mS/cm ±0.5% of reading or .001 mS/cm, whichever is greater

100 to 200 mS/cm ±1.0% of reading

Resolution: 0.001, 0.01, or 0.1 mS (range dependent)

Specific Conductance

Units: μS/cm, mS/cm

Range: 0 to 200 mS/cm

Accuracy: 0 to 100 mS/cm ±0.5% of reading or .001 mS/cm, whichever is greater

100 to 200 mS/cm ±1.0% of reading

User selectable reference temperature (15 to 25°C; default 25°C) and compensation
coefficient (0 to 4%/°C; default 1.91%)

Resolution: 0.001, 0.01, 0.1 mS/cm

Warranty 2 years on cable, probe, and ODO sensor cap

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