Geotech Mastehead


Water Quality Field Meters

YSI Professional Series Meters

Testing river with YSI Pro


The easiest, most versatile handheld solution for spot sampling in the field or lab. Simply choose the Pro Series model, cable length, and probes that are right for your specific application – from aquaculture to surface water to wastewater and more.

  • Each instrument provides multiple probe
    or cable options.
  • Detachable cables and probes mean less downtime.
  • Backlit keypad and display (Pro Plus) or glow-in-the-dark keypad for low light measurements.
  • IP67 Rated
  • 3-Year Warranty on Instrument
    2-Year Warranty on Cables
    1-Year Warranty on Probes
    6-Month Warranty on Galvanic DO Probes

YSI Professional Plus
Professional Plus

YSI Pro1020, Pro1030, Pro2030
Pro1020, Pro1030, Pro2030

YSI Pro10, Pro20, Pro30
Pro10, Pro20, Pro30

YSI Professional Plus Multiparameter

The flagship of the Professional Series, YSI Professional Plus accommodates any combination of Pro Series probe, cable, and accessory. This compact handheld allows you to instantly change probes and cables. You determine what you want the instrument to measure and display.

  • Choose your own combination of the various parameters:
    Ammonium, Chloride, Conductivity, Dissolved Oxygen (DO), Nitrate, Oxidation Reduction Potential (ORP), pH, Temperature, Salinity, Resistivity, Total Dissolved Solids (TDS)
  • 5,000 data-set memory
  • Interval or single-event logging capability
  • Free, Data Manager desktop software and ProComm II saddle

Call 1-800-833-7958

YSI Professional Series Specifications
YSI Professional Plus User Manual


YSI Pro1020
pH, ORP, ORP/Redox, Polarographic or Galvanic DO sensors, and Temperature.

YSI Pro1030
pH, ORP/Redox, Conductivity, Specific Conductance, Salinity, Total Dissolved Solids (TDS), and Temperature.

YSI Pro2030
DO, Conductivity, Specific Conductance, Salinity, Total Dissolved Solids (TDS), Barometer and Temperature.

YSI Professional Series Specifications
YSI Pro1020 User Manual
YSI Pro1030 User Manual
YSI Pro2030 User Manual

Call 1-800-833-7958


YSI Pro10
pH or ORP/Redox, and Temperature.

YSI Pro20
DO and Temperature.

YSI Pro30
Conductivity, Specific Conductance, Salinity, Total Dissolved Solids (TDS), and Temperature.

YSI Professional Series Specifications
YSI Pro20 User Manual
YSI Pro30 User Manual

Call 1-800-833-7958

YSI Amplified Sensors

YSI ProDSS with 4-Port Bulkhead

Multiparameter Sampling Instrument

The YSI ProDSS is a rugged single or multiparameter water quality instrument designed for use in applications that include surface water, groundwater, coastal, and agriculture. The ProDSS features optional user-replaceable digital smart sensors that are automatically recognized when connected to the instrument. The optional GPS function, a broad range of sensors, and varying cable options allow for complete customization of the ProDSS.

  • Backlit Color Display and keypad can be seen in varying light conditions
  • Long-Life rechargeable lithium-ion battery
  • Large Memory, >100,000 data sets with site list and data ID tag
  • USB on-the-go connectors for PC connection and recharging
  • KorDSS data management software with geo- mapping (GPS optional)
  • User-replaceable cables and sensors
  • Rugged, IP-67 rated waterproof case
  • Military-spec cable connectors
  • Titanium sensor bodies
  • Multiple Languages; English, Spanish, Portuguese, French, German, Italian, Japanese, Norwegian, Chinese, Korean, and Thai
  • 3-year handheld instrument warranty
  • 2-year cable assembly and sensor warranty
  • 1-year pH and ORP sensor warranty
  • 6-month ammonium, nitrate, and chloride sensor warranty

Call 1-800-833-7958

YSI ProDSS Specifications
YSI ProDSS User Manual
YSI ProDSS Quick Start Guide

YSI Pro20i

YSI Pro20i Dissolved Oxygen/Temperature

Easy to use, rugged and reliable, the YSI Pro20i provides everything you need in a handheld instrument for the measurement of dissolved oxygen (DO). A true field instrument with IP-67 waterproof, rubber over molded case, military spec connectors and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions.

With the Pro20i, accuracy is not compromised for ruggedness. The Pro20i can easily be calibrated for fast, accurate measurements you can trust.

  • Integral (i.e. built-in) Cable: 1, 4, and 10 meter field cables to choose from
  • User-replaceable DO sensors
  • One Touch Cal: Allows for easy DO calibrations within 3 seconds with the press of a button
  • Automatic barometric pressure compensation
  • Quick response times: T-95 response time in 8 seconds with standard membrane (fastest response time on the market)
  • Stores 50 data sets: No need to write down data
  • Large graphic, backlit display and glow in the dark keypad, visible in any lighting condition
  • Display is visible when wearing polarized sunglasses
  • A true field instrument with IP-67, impact-resistant, waterproof case. Waterproof with and without the battery cover.
  • Rubber over molded, slip-proof case provides extra durability
  • Multiple languages: English, Spanish, French, and German
  • Warranty: 3-year instrument, 2-year integral cable, 1-year polarographic sensors, 6-month galvanic sensor

Call 1-800-833-7958

YSI Pro20i Specifications
YSI Pro20i User Manual


YSI ProODO with OBOD Prob anf Lab DockYSI ProOBOD Probe
inserted into BOD bottle
and connected to a YSI Pro.
All are mounted to the YSI Lab Dock.

Optical Dissolved Oxygen Meters
and ProOBOD Probe

The ProSolo DIGITAL water quality meter features an advanced optical dissolved oxygen (ODO) probe that can be combined with either a temperature (ODO/T) or conductivity (ODO/CT) sensor. The ProSOLO handheld meets the demands of field work with a large LCD graphic display, waterproof case and interchangeable military-spec cable connector. User-replaceable cables are available in lengths that range from 1 to 100 meters.

The YSI ProOBOD probe is used with YSI ProSolo handheld optical dissolved oxygen instruments. The ProOBOD easily connects to ProSolo handhelds and makes it convenient to conduct lab BOD’s with a very compact footprint.

Electrochemical Sensor:

  • No stirring ODO sensor technology
  • Less drift over time; holds calibration longer
  • No membrane or electrolyte; less maintenance
  • Real-time salinity compensation of DO measurements (ODO/CT)
  • 2 Year Warranty (cable, probe, and ODO sensor cap)

ProSolo DIGITAL Handheld:

  • Ergonomic comfortable grip
  • Easy-to-read color display and backlit keypad
  • Waterproof IP-67 rating
  • Military-Spec (MS) cable connector
  • Long-life rechargeable lithium-ion battery
  • Large onboard memory; export to included USB flash drive
  • Barometric pressure
  • 3 Year Warranty

ProOBOD Probe:

  • Smart sensor retains calibration in the probe
  • User-replaceable, low-maintenance sensor with
    +1-year life
  • 2-year warranty; reliable and serviceable, design reduces cost-of-ownership and reduces down-time
  • Probe body tapered to fit into a standard 300 mL BOD bottle and international versions
  • Extremely quiet operation
  • No warm-up time required
  • Self-stirring to provide representative sample and increase response times

Call 1-800-833-7958

YSI ProSolo Specifications
YSI ProSolo User Manual
YSI ProSolo Quick Start Guide
YSI ProOBOD User Manual



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