Xylem's YSI Pro Series has the right tool for every water professional
The YSI Professional Series handheld systems are trusted around the world and known for their field durability, ease of use, and—most importantly—providing reliable water quality data. The industry-leading YSI Pro Series systems are available in a variety of parameter configurations, enabling you to choose the perfect instrument for your application!
All Pro Series handhelds feature waterproof and and rugged build quality. They are also easy to use, calibrate, and maintain, while providing quality and accurate data. Handhelds include built-in temperature compensation, ensuring accurate readings and improving calibration precision across different environmental conditions.
Durability
- Military-spec cable connectors
- IP-67 waterproof
- Rubber over-molded casing and drop rated to 1 meter
Ease-of-Use
- User-replaceable sensor and cables
- High-visibility backlit display
- Intuitive, menu-driven interface
Reliable Data
- Smart calibration
- Optical or electrochemical DO
- 3-year instrument warranty; 2-year cable warranty
Applications
The YSI Pro Series line of handheld water quality instruments is designed for reliable and accurate measurements in various environmental monitoring applications. With a rugged build and field-ready features, these handhelds support professionals in ensuring water quality across multiple industries.
- Aquaculture: Monitoring and managing water quality parameters such as dissolved oxygen, pH, and temperature to ensure optimal conditions for fish and shellfish farming.
- Surface Water: Assessing ecological health by measuring parameters in rivers, lakes, and streams to ensure compliance with environmental standards.
- Groundwater: Evaluating water quality in aquifers and wells to detect contamination and manage water resources.
- Coastal Waters: Measuring salinity, dissolved oxygen, and other critical parameters in marine environments to support research and environmental assessments.
- Wastewater: Monitoring key indicators such as biological oxygen demand and pH in wastewater treatment processes to ensure regulatory compliance and process efficiency.
YSI Pro Series Handhelds
Our handheld water testing meters are designed for a range of water quality testing applications and we offer different options for your specific needs. See below for our lineup of portable water quality analyzers:
- Multiparameter handhelds for measuring multiple parameters simultaneously
- Dissolved Oxygen (DO) handhelds for accurate oxygen monitoring
- Dual-sensor handhelds for flexible testing
- Single-sensor handhelds for focused, efficient, and economical testing is paramount
Multiparameter Handhelds
| Model | Included Parameters | Options |
|---|---|---|
|
ProDSS
Pro Digital1 |
Temperature | Barometric Pressure, GPS, Depth |
|
ProQuatro
Analog Sensor |
Temperature, Conductivity, Galvanic or Polarographic DO | Up to 2 additional ISE sensors (pH, ORP, ammonium, chloride, nitrate) |
Dissolved Oxygen (DO) Handhelds
| Model | Included Parameters | Options |
|---|---|---|
|
ProSolo
Pro Digital1 |
Optical Dissolved Oxygen, Temperature | ODO/Temperature, Barometric Pressure, ODO/Conductivity, OBOD for lab use |
|
Pro20
Analog Sensor |
Electrochemical DO, Temperature | Field probe and/or BOD-style probe, Choice of Galvanic or Polarographic DO |
Dual Sensor Handhelds
| Model | Included Parameters | Options |
|---|---|---|
|
Pro1020
Analog Sensor |
pH or ORP, Galvanic or Polarographic DO, Temperature | Amplified pH sensor for low ionic strength water |
|
Pro1030
Analog Sensor |
pH or ORP, Conductivity, Temperature | Amplified pH sensor for low ionic strength water |
|
Pro2030
Analog Sensor |
Galvanic or Polarographic DO, Conductivity, Temperature, Barometric Pressure |
Single Sensor Handhelds
| Model | Included Parameters | Options |
|---|---|---|
|
ProSwap
Analog Sensor |
Temperature, Barometric Pressure | GPS, Depth |
|
Pro10
Analog Sensor |
pH or ORP, Temperature | Amplified pH sensor for low ionic strength water |
|
Pro30
Analog Sensor |
Conductivity, Salinity, TDS, Temperature |
1 Pro Digital sensors store their own calibration data for easy swaps, smart sensors auto-recognize parameters, reducing setup time, Titanium housing increases durability; 2-year warranty, Stored calibration ensures consistent readings across devices.
2 EPA-approved methodology for compliance reporting of BOD, CBOD, DO, and pH
3 EPA-approved methodology for compliance reporting of BOD, CBOD, and DO
Multiparameter Handhelds
Versatile water quality measurement in a single device, allowing users to monitor multiple parameters—such as dissolved oxygen, pH, conductivity, and more—simultaneously.
ProDSS
The ProDSS is a multiparameter handheld in the Pro Digital lineup, designed for use with digital smart sensors. It offers customizable features and proven quality for reliable water quality measurements.
Top Features
- ProDSS 4-port cable assembly: combine any four ProDSS sensors on a single cable assembly
- Available with depth sensor or without depth sensor
- Durable, titanium welded sensors
- Optional Depth
- Optional GPS
- EPA-approved methodology for compliance reporting
- Optical Dissolved Oxygen
- Turbidity1
- Total Algae – Phycocyanin1
- Total Algae – Phycoerythrin1
- pH
- ORP / Redox
- Conductivity
- Specific Conductance2
- Salinity2
- Total Dissolved Solids (TDS)2
- Resistivity2
- Seawater Density
- Total Suspended Solids (TSS)
- Depth4
- GPS Coordinates4
- Ammonium/Ammonia
- Chloride
- Nitrate
- Temperature3
- Barometric Pressure3
ProQuatro
The ProQuatro offers a cost-effective solution for multiparameter water quality sampling. For efficient measurements, combine temperature, conductivity, galvanic or polarographic DO, and your choice of two ISEs (pH, ORP, ammonium, chloride, or nitrate) with the 4-port Quatro cable.
Top Features
- 4-port Quatro cable: combine four analog sensors on a single cable assembly
- Galvanic or polarographic dissolved oxygen
- Self-stirring BOD probe option for the laboratory
- EPA-approved methodology for compliance reporting of BOD, CBOD, DO, and pH
- Single-point or continuous logging modes
- Dissolved Oxygen (galvanic or polarographic)
- pH
- ORP / Redox
- Conductivity
- Specific Conductance2
- Salinity2
- Total Dissolved Solids (TDS)2
- Resistivity2
- Ammonium / Ammonia
- Chloride
- Nitrate
- Temperature2
Dissolved Oxygen Handhelds
Purpose-built for dedicated DO measurement, offering a streamlined solution for users who only need oxygen monitoring without additional parameters.
ProSolo
The ProSolo is designed for easy, portable optical dissolved oxygen measurements and is part of the Pro Digital lineup, which allows the use of digital smart sensors for enhanced data accuracy and flexibility. It utilizes YSI’s reliable Optical Dissolved Oxygen (ODO) technology and can be used with a field probe or BOD-style probe.
Top Features
- Single-cable assemblies:
- ODO/Temperature
- ODO/Conductivity/Temperature
- OBOD with Temperature for the laboratory
- EPA-approved methodology for compliance reporting of BOD, CBOD, and DO
Pro20
The Pro20 portable dissolved oxygen meter uses membrane-covered electrochemical sensors for a reliable, lower-cost alternative to optical-based sensors. Like the ProSolo, the Pro20 is available with a field probe and/or a BOD-style probe.
Top Features
- Replaceable electrodes
- Choice of galvanic or polarographic DO electrode
- BOD/Temperature probe for the laboratory
- Easy to replace cap membranes
- EPA-approved methodology for compliance reporting of BOD, CBOD, and DO
- One Touch Cal feature calibrates DO in seconds
Dual-Sensor Handhelds
Flexibility to measure two parameters simultaneously, reducing the need for multiple instruments and improving efficiency in the field or lab. These handhelds support various sensor combinations to tailor measurements to specific needs. Dual-sensor handhelds provide a cost-effective and convenient solution for accurate, real-time water quality analysis.
Pro1020
The Pro1020 combines features of the Pro Series pH and electrochemical dissolved oxygen sensors for dual-sensor measurement.
Top Features
- Choice of either:
- pH or ORP sensor
- Galvanic or polarographic dissolved oxygen
- Optional amplified pH sensor for cold or low ionic strength water
- Automatic pH buffer recognition
- Easy to replace membranes
- Integrated temperature sensor
Pro1030
The Pro1030 combines the features of the Pro Series pH or ORP and conductivity sensors for dual-sensor measurement.
Top Features
- Choice of either pH or ORP sensor
- Optional amplified pH sensor for cold or low ionic strength water
- Automatic pH buffer recognition
- Easy cleaning of the conductivity cell
- Salinity and TDS measurements calculated from conductivity
- Integrated temperature sensor
- Easy to replace membranes
Pro2030
The Pro2030 is the ideal handheld for those who require automatic salinity compensation for dissolved oxygen. It combines features of the Pro Series membrane-covered dissolved oxygen and conductivity sensors for dual-sensor measurement.
Top Features
- Choice of either galvanic or polarographic dissolved oxygen
- Easy to replace membranes
- Easy cleaning of the conductivity cell
- Salinity and TDS measurements calculated from conductivity
- Integrated temperature sensor
Single-Sensor Handhelds
Single-sensor handhelds provide a focused, cost-effective solution for measuring one parameter at a time with high accuracy. While some models, like the ProSwap, allow users to swap sensors for different measurements, these instruments are designed for simplicity, easy calibration, and reliable performance in both field and lab environments.
ProSwap
The ProSwap handheld is part of the Pro Digital lineup, allowing the use of digital smart sensors for enhanced accuracy and flexibility. It features a 1-port cable design with swappable sensors, enabling users to focus on the parameter needed for their application.
Top Features
- Single-sensor cable design for interchangeability with any ProDSS sensor
- Built-in thermistor
- Calibration data saved in the sensor
- Durable, titanium welded sensors
- Optional Depth
- Optional GPS
- Single-point or continuous logging modes
- Optical Dissolved Oxygen
- Turbidity1
- Total Algae – Phycocyanin1
- Total Algae – Phycoerythrin1
- pH
- ORP / Redox
- Conductivity
- Specific Conductance2
- Salinity2
- Total Dissolved Solids (TDS)2
- Resistivity2
- Seawater Density
- Total Suspended Solids (TSS)
- Depth
- GPS Coordinates4
- Ammonium/Ammonia
- Chloride
- Nitrate
- Temperature
- Barometric Pressure4
Pro10
The Pro10 provides everything you need in a handheld instrument to measure pH, ORP, or both.
Top Features
- Choice of either:
- pH or ORP sensor
- Optional amplified pH sensor for cold or low ionic strength water
- Automatic pH buffer recognition
Pro30
The Pro30 provides accurate and reliable conductivity, salinity, TDS, and temperature data through a stable, 4-electrode conductivity cell.
Top Features
- Conductivity cell built into the 2-year cable warranty
- Easy cleaning of the conductivity cell
- Salinity and TDS measurements calculated from conductivity
- Integrated temperature sensor
Video Resources for YSI Water Quality Handhelds
Video: How to Select a Handheld Dissolved Oxygen Meter
YSI ProQuatro vs ProDSS | Key Differences to Consider
