YSI Professional Plus Water Tester Meter with Quattro ISE-ISE-DO-COND


SKU: ysiproplus2
Available for pre-order

Web Information

The Pro Plus multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

EPA approved for drinking water and wastewater compliance reporting.

The Quatro cable attached to the Pro Plus allows you to utilize 4-ports to measure temperature/conductivity, DO, and any two ISEs among pH, ORP, ammonium, chloride, or nitrate creating an extremely powerful handheld multiparameter instrument.

The Pro Plus instrument meets the demands of true field work. The instrument is rated to IP-67 standards even without the battery cover on. Other tough features include a 3-year warranty, Mil-spec connectors, rubber overmolded case, and a 2-year cable warranty. In-house testing procedures also include 1-meter drop tests from all angles to ensure expected field-durability.

Tough, Field Durability Features Include:

Easy-to-install cable weights; can be daisy-chained for additional weight*
Rubber, over-molded IP-67 waterproof case (even without the battery cover)*
3-year instrument warranty
2-year cable warranty*
Rugged cables, sensors, and military-spec connectors*
Drop-tested 1 meter at all angles*
Scratch-resistant lens; viewable with polarized glasses
Instrument floats
Weighted, user-replaceable multi-sensor design

The instrument provides numerous benefits from the following features; 5,000 data-set memory, password protection, backlit display and keypad, graphic display with detailed Help functionality, re-cal prompts, user defined fields, detailed GLP, auto stable, Hold All Readings function, Data Manager software for the desktop, USB connection, auto-buffer recognition, and flexible folders and site lists for logging data.

Smart Features Include:

5,000 data set memory
Detailed on-screen Help function*
Free, Data Manager desktop software and ProComm II saddle*
Interval or single-event logging
100 folder & site list data structure*
Password protection
Detailed GLP data
USB connection also powers the instrument
6-point cal with auto-buffer recognition*
User-adjustable auto-stable with prompts*
User-upgradeable software via waterproof USB port
Recalibration prompts
Search function filters user-defined data information*
Backlit display AND keypad*
Cable management kit included with all cables from 4- to 30-meters*

Most Versatile
Connect any Professional Series cable (excludes ODO cables) and probe option to the instrument and use the convenient cable management kit to keep everything simple and organized. Cable options range from 1-, 4-, 10-, 20-, and 30-meter choices (up to 100-meters on DO only cables). Use lab or field probes and switch between the two quickly. The Pro Plus makes an ideal lab BOD instrument with the proven self-stirring BOD probe (EPA Approved). A convenient handstrap can be used on either side of the instrument. A complete family of accessories also increases the versatility of the Pro Plus. Choose among accessories including carrying cases, flow cells, cable weight, belt clip, tripod, and c-clamp.

YSI now offers an Extended Warranty for the Pro Plus (new instruments only).

Please visit the Professional Plus Kits page for fully assembled systems.

Added Versatility Features Include:

Adjustable right- or left-handed hand strap*
Multiple user-replaceable sensor options and a choice of DO sensors*
Multiple parameter options and cable lengths
Lab-grade ISE sensors and BOD probe available to make a true lab/field instrument
Languages - English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese, Chinese (Simplified and Traditional)
Wide array of accessories are available from flow cells, to shoulder straps, to carrying cases.



Received from a working laboratory environment.  Sold with warranty. 


  • YSI Professional Plus Water Tester Meter
  • Quatro Cable
  • Quatro ISE-ISE-DO-COND with single sensor installed
  • (2) new C cell alkaline batteries installed



30 Day warranty. We pledge to offer the best service and warranty to all of our customers!  We are extending a 30 Day warranty on this item. This is our way of saying thank you for allowing us to serve you.


This is a genuine product from this manufacturer.


The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. the item is subject to FDA regulation, we will verify your status as an authorized purchaser of this item before shipping of the item."

Regardless of the origin of the equipment, documentation provided or identification appearing upon the equipment, the equipment described and offered here is in no way certified for, recommended for, or offered for any specific use. The purchaser agrees that the seller shall not be held responsible or liable for any injuries or damages, whether incidental or consequential, associated in any way with the equipment. The purchaser, by bidding on this equipment, indicates their acknowledgment of, and agreement to the terms of this disclaimer. it is the purchaser's responsibility to have the item inspected and certified by a qualified professional before use!