YSI ProQuatro Water Quality Meter

The YSI ProQuatro handheld multiparameter meter delivers reliable, versatile performance for both field and lab applications. Designed to measure a wide range of core water quality parameters, the ProQuatro combines durability, ease of use, and EPA-compliant accuracy in one powerful handheld instrument.

Comprehensive Water Quality Measurements

The ProQuatro supports multiple sensor options, allowing measurement of:

• Dissolved oxygen (DO)

• Conductivity & specific conductance

• Salinity & resistivity

• Total dissolved solids (TDS)

• pH & ORP (individual or combination)

• Ammonium (ammonia)

• Nitrate

• Chloride

• Temperature

In the lab, the ProQuatro is also a strong performer for BOD, pH, and ORP testing.
EPA approved for drinking water and wastewater compliance reporting.

Note: The ProQuatro handheld is sold separately. Cables, probes/sensors, and accessories are ordered individually for a customized setup.

Designed for Versatility

The ProQuatro is optimized for use with the 4-port Quatro cable, enabling comprehensive multiparameter sampling. Connect up to four sensors on a single cable to measure temperature, conductivity, dissolved oxygen, and any two ISEs (pH, ORP, ammonium, nitrate, or chloride).

Built for the Field

Engineered for rugged environments, the ProQuatro is ready for demanding fieldwork:

• IP-67 waterproof case (withstands immersion, even without battery cover)

• Drop-tested to 1 meter on all sides

• Rugged, military-spec connectors and cables

• User-replaceable, weighted multi-sensor design

• Easy-to-add cable weights (daisy-chainable for deeper deployments)

• Scratch-resistant lens, viewable with polarized glasses

• Ergonomic, one-handed design with floating capability

• Backlit display & glow-in-the-dark keypad

• Cable management kit included with 4–30 m cables

• Warranty: 3 years (instrument), 2 years (cables)

Advanced Data & Calibration Features

• Stores up to 5,000 data sets

• Interval or single-event logging

• 50 user-defined Data IDs

• Detailed GLP-compliant records

• On-The-Go USB port for easy data transfer

• 6-point calibration with auto-buffer recognition

• Adjustable auto-stable function with prompts

• Software upgrades via waterproof USB port

• Recalibration reminders

• Search function to filter data

• USB connection powers the instrument

Flexible Handheld Options

• Wide range of sensor combinations and cable lengths (1, 4, 10, 20, 30 m; up to 100 m with DO-only cables)

• Compatible with all Professional Series cables and probes (field and lab)

• Choice of DO sensor (polarographic or galvanic)

• Lab-grade ISE sensors and BOD probe available for dual lab/field use

• Adjustable left- or right-hand strap for comfort

• Multilingual interface (English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese, Simplified & Traditional Chinese)

• Extensive accessories available to customize your kit

What’s Included

Each ProQuatro handheld package includes:

• ProQuatro instrument

• User manual

• Batteries

• USB cable

• USB flash drive with software and digital documentation

(Cables and probes are sold separately to configure the system to your exact needs.)

Why Choose ProQuatro?

The ProQuatro is the ideal choice for professionals who want affordable, customizable, and dependable multiparameter sampling. Whether in the field or the lab, the ProQuatro adapts to your workflow with precision and durability you can trust.