YSI Professional Plus

Handheld Multiparameter Water Quality Meter

YSI’s Professional Plus handheld multiparameter water quality instrument provides advanced features, low cost of ownership, and extreme flexibility through its use of interchangeable cables and probes. Options are available for DO, pH, conductivity, ORP, Ammonium, Chloride, and Nitrates. Cables are available for various sensor combinations in lengths ranging from 1 to 100 meters. The Quattro cable allows up to four probes (5 parameters plus barometric pressure) to be monitored simultaneously. Cables can be swapped within seconds allowing the Professional Plus to make an easy transition between the field and the lab.

YSI's Professional Plus handheld multiparameter water quality instrument provides advanced features, low cost of ownership, and extreme flexibility through its use of interchangeable cables and probes. Options are available for DO, pH, conductivity, ORP, Ammonium, Chloride, and Nitrates. Cables are available for various sensor combinations in lengths ranging from 1 to 100 meters. The Quattro cable allows up to four probes (5 parameters plus barometric pressure) to be monitored simultaneously. Cables can be swapped within seconds allowing the Professional Plus to make an easy transition between the field and the lab.

The YSI Professional Plus is the recommended replacement for the 556 MPS multiparameter meter. It can also be configured to replace the Model 63 pH and conductivity meter, or any of YSI's classic handheld line, while providing the increased versatility of all the other available probe and cable options.

Every Professinal Plus configuration measures temperature (built into every cable) and barometric pressure (built into the instrument). Three types of DO probes are available, galvanic, polarographic, and a self stirring BOD probe that is excellent for lab use. Conductivity probes can also derive resistivity, salinity, specific conductance, and total dissolved solids. The pH probes are very accurate with a resolution of .01 and the ability to perform up to a 6 point calibration. ORP, pH, Ammonium, Chloride, and Nitrate probes can be installed in any cable with an ISE port. A combination pH/ORP probe that uses only 1 ISE port is also available.

Both the galvanic and polarographic DO sensors from YSI feature the same range, accuracy, and resolution. When choosing between the two the deciding factor is warm up time vs sensor longetivity. Galvanic sensors require no warm up time. Polarographic sensors typically require warming up for 5 to 15 minutes, but have a longer sensor life.

The Professional Plus features a large, backlit, graphical LCD display with an integrated help system and multiple languages. Datalogging is built in with enough memory for 2,000 datasets, GLP event logging, and both interval and event based logging capabilities. The included Data Manager software is easy to use and allows the user to manage instruments and data, perform real time studies, and produce graphs. The Professional Plus helps to make your job easier with additional features like auto buffer recognition, auto stabilization, re calibration prompts, and an operating time of up to 80 hours with just 2 C alkaline batteries.

Rugged, easy to use, and reliable, the Professional Plus floats in water and is rated IP-67 even without its battery cover. It is covered by a 3 year warranty on the instrument, and 2 years on cables and probes. Military spec connectors, a rubber overmolded case, a scratch resistant display, and extensive in house drop testing, ensures field durability. The Professional Plus is well suited for the most demanding jobs and will provide many years of service.

YSI Professional Plus Ordering Instructions

The Professional Plus can be ordered as a complete kit below which includes the instrument, cable, probes, and a carrying case or lab dock. Alternatively, all the components can be ordered individually to form a custom configuration. Additional cables and probes can be ordered for use with any Professional Plus.

A custom Professional Plus configuration would consist of the instrument, a cable, and probes for that cable (if they are not included with the cable), all purchased seperately. Multiple cables and sensors can be ordered allowing the Professional Plus to be quickly reconfigured in the field for multiple tasks.

Cables are available below in different lengths and with different ports. All cables include a temperature probe, and some come with sensors included. Cables over 1 meter in length come with a cable management kit. Notes are provided to describe what probes are compatible and need to be purchased seperately. Probes, along with their cable compatibility, are also listed.

Calibration solutions and accessories like flow cells, carrying cases, replacement DO membrane kits, and cable weights are also available.

YSI Professional Plus Features

  • Interchangeable cables and probes provide versatility, minimize downtime, and reduce costs
  • A variety of probe and cable combinations area available
    DO, pH, ORP, Conductivity, Ammonium, Chloride, and Nitrates
  • Temperature and barometric pressure measurements included with every setup
  • Resistivity, salinity, specific conductance, and total dissolved solids derived from conductivity
  • Both the display and keypad are backlit*
  • On screen help system*
  • Software and communications saddle included*
  • Auto buffer recognition, 6 point pH calibration*
  • User upgradeable firmware
  • Single event or interval logging
  • 2,000 data-set memory
  • Software upgradable by USB
  • Durable probes, military spec connectors*
  • Durable enclosure, IP67 rated even without battery cover*
  • 3 year instrument warranty, 2 year cable warranty*

* Only available on handhelds from YSI

YSI Professional Plus Complete Kits

  • Part Number/Description
  • Cart
  • Price
    • Configure a Professional Plus4
    • Cable
      Temp Port
      Conductivity Port
      ISE Port
      ISE Port 1
      ISE Port 2
      DO Port
      Case
      Flow Cell
      Flow Cell
      Flow Cell

      Please enable JavaScript in your browser to configure this product.
      To place an order by phone please call 1-888-234-5678

  • 603179Professional Plus Field Kit1
    4 meter cable with polarographic DO probe
  • Order
  • Call for Price
  • 603178Professional Plus Field Kit1
    4 meter cable with galvanic DO probe
  • Order
  • Call for Price
  • 603188Professional Plus Field Kit1
    4 meter cable with cond and pH probe
  • Order
  • Call for Price
  • 603189Professional Plus Field Kit1
    10 meter cable with cond and pH probe
  • Order
  • Call for Price
  • 603181Professional Plus Field Kit1
    4 meter cable with cond and galvanic DO probe
  • Order
  • Call for Price
  • 603180Professional Plus Field Kit1
    4 meter cable with cond and polarographic DO probe
  • Order
  • Call for Price
  • 603184Professional Plus Field Kit1
    4 meter cable wth polarographic DO and pH probe
  • Order
  • Call for Price
  • 603185Professional Plus Field Kit1
    4 meter cable with galvanic DO and pH probe
  • Order
  • Call for Price
  • 603182Professional Plus Field Kit1
    10 meter cable with cond and polarographic DO probe
  • Order
  • Call for Price
  • 603183Professional Plus Field Kit1
    10 meter cable with cond and galvanic DO probe
  • Order
  • Call for Price
  • 603186Professional Plus Field Kit1
    10 meter cable with polarographic DO and pH probe
  • Order
  • Call for Price
  • 603187Professional Plus Field Kit1
    10 meter cable with galvanic DO and pH probe
  • Order
  • Call for Price
  • 603191Professional Plus Field Kit1
    4 meter Quatro cable with cond, galvanic DO, and pH probe
  • Order
  • Call for Price
  • 603190Professional Plus Field Kit1
    4 meter Quatro cable with cond, polarographic DO, and pH probe
  • Order
  • Call for Price
  • 603223Professional Plus Field Kit1
    4 meter Quatro cable with cond, polarographic DO, and pH/ORP probe
  • Order
  • Call for Price
  • 603224Professional Plus Field Kit1
    4 meter Quatro cable with cond, galvanic DO, and pH/ORP probe
  • Order
  • Call for Price
  • 603165Professional Plus Lab Kit2
    ProBOD self stirring BOD probe
  • Order
  • Call for Price
  • 603166Professional Plus Lab Kit2
    ProBOD self stirring BOD probe and 1 meter lab cable with pH probe
  • Order
  • Call for Price
  • 603167Professional Plus Field and Lab Kit3
    ProBOD self stirring BOD probe and 4 meter field cable with DO probe
  • Order
  • Call for Price

YSI Professional Plus Instrument Only

  • Part Number/Description
  • Cart
  • Price
  • 6050000Professional Plus1 instrument only2
  • Order
  • Call for Price

YSI Professional Plus Cable Assemblies

  • Part Number/Description
  • Cart
  • Price
  • 60510-1Cable for Professional Plus, 1 meter
    1 ISE2 port3/temp
  • Order
  • Call for Price
  • 60510-4Cable for Professional Plus4, 4 meter
    1 ISE2 port3/temp
  • Order
  • Call for Price
  • 60510-10Cable for Professional Plus4, 10 meter
    1 ISE2 port3/temp
  • Order
  • Call for Price
  • 60510-20Cable for Professional Plus4, 20 meter
    1 ISE2 port3/temp
  • Order
  • Call for Price
  • 60510-30Cable for Professional Plus4, 30 meter
    1 ISE2 port3/temp
  • Order
  • Call for Price
  • 60520-1Cable for Professional Plus, 1 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60520-4Cable for Professional Plus4, 4 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60520-10Cable for Professional Plus4, 10 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60520-20Cable for Professional Plus4, 20 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60520-30Cable for Professional Plus4, 30 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60520-100Cable for Professional Plus4, 100 meter
    DO port5/temp
  • Order
  • Call for Price
  • 60530-1Cable for Professional Plus, 1 meter
    cond6/temp probe included
  • Order
  • Call for Price
  • 60530-4Cable for Professional Plus4, 4 meter
    cond6/temp probe included
  • Order
  • Call for Price
  • 60530-10Cable for Professional Plus4, 10 meter
    cond6/temp probe included
  • Order
  • Call for Price
  • 60530-20Cable for Professional Plus4, 20 meter
    cond6/temp probe included
  • Order
  • Call for Price
  • 60530-30Cable for Professional Plus4, 30 meter
    cond6/temp probe included
  • Order
  • Call for Price
  • 6051010-1Cable for Professional Plus, 1 meter
    2 ISE2 ports78/temp
  • Order
  • Call for Price
  • 6051010-4Cable for Professional Plus4, 4 meter
    2 ISE2 ports78/temp
  • Order
  • Call for Price
  • 6051010-10Cable for Professional Plus4, 10 meter
    2 ISE2 ports78/temp
  • Order
  • Call for Price
  • 6051010-20Cable for Professional Plus4, 20 meter
    2 ISE2 ports78/temp
  • Order
  • Call for Price
  • 6051010-30Cable for Professional Plus4, 30 meter
    2 ISE2 ports78/temp
  • Order
  • Call for Price
  • 6051020-1Cable for Professional Plus, 1 meter
    1 ISE2 port3/DO port5/temp
  • Order
  • Call for Price
  • 6051020-4Cable for Professional Plus4, 4 meter
    1 ISE2 port3/DO port5/temp
  • Order
  • Call for Price
  • 6051020-10Cable for Professional Plus4, 10 meter
    1 ISE2 port3/DO port5/temp
  • Order
  • Call for Price
  • 6051020-20Cable for Professional Plus4, 20 meter
    1 ISE2 port3/DO port5/temp
  • Order
  • Call for Price
  • 6051020-30Cable for Professional Plus4, 30 meter
    1 ISE2 port3/DO port5/temp
  • Order
  • Call for Price
  • 6051030-1Cable for Professional Plus, 1 meter
    1 ISE2 port3/cond6/temp
  • Order
  • Call for Price
  • 6051030-4Cable for Professional Plus4, 4 meter
    1 ISE2 port3/cond6/temp
  • Order
  • Call for Price
  • 6051030-10Cable for Professional Plus4, 10 meter
    1 ISE2 port3/cond6/temp
  • Order
  • Call for Price
  • 6051030-20Cable for Professional Plus4, 20 meter
    1 ISE2 port3/cond6/temp
  • Order
  • Call for Price
  • 6051030-30Cable for Professional Plus4, 30 meter
    1 ISE2 port3/cond6/temp
  • Order
  • Call for Price
  • 6052030-1Cable for Professional Plus, 1 meter
    DO port5/cond6/temp
  • Order
  • Call for Price
  • 6052030-4Cable for Professional Plus4, 4 meter
    DO port5/cond6/temp
  • Order
  • Call for Price
  • 6052030-10Cable for Professional Plus4, 10 meter
    DO port5/cond6/temp
  • Order
  • Call for Price
  • 6052030-20Cable for Professional Plus4, 20 meter
    DO port5/cond6/temp
  • Order
  • Call for Price
  • 6052030-30Cable for Professional Plus4, 30 meter
    DO port5/cond6/temp
  • Order
  • Call for Price
  • 605790-1Quatro cable for Professional Plus, 1 meter
    2 ISE2 ports78/DO port5/cond6/temp
  • Order
  • Call for Price
  • 605790-4Quatro cable for Professional Plus4, 4 meter
    2 ISE2 ports78/DO port5/cond6/temp
  • Order
  • Call for Price
  • 605790-10Quatro cable for Professional Plus4, 10 meter
    2 ISE2 ports78/DO port5/cond6/temp
  • Order
  • Call for Price
  • 605790-20Quatro cable for Professional Plus4, 20 meter
    2 ISE2 ports78/DO port5/cond6/temp
  • Order
  • Call for Price
  • 605790-30Quatro cable for Professional Plus4, 30 meter
    2 ISE2 ports78/DO port5/cond6/temp
  • Order
  • Call for Price
  • 605107Cable for Professional Plus, 1 meter
    pH/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605177Cable for Professional Plus, 4 meter
    pH/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605108Cable for Professional Plus, 1 meter
    ORP/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605178Cable for Professional Plus, 4 meter
    ORP/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605109Cable for Professional Plus, 1 meter
    pH/ORP/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605179Cable for Professional Plus, 4 meter
    pH/ORP/temp probe1 included, lab grade
  • Order
  • Call for Price
  • 605780Cable for Professional Plus, 1 meter
    ProBOD self stirring BOD probe included, 115 VAC
  • Order
  • Call for Price

YSI Professional Plus Probes

  • Part Number/Description
  • Cart
  • Price
  • 605202DO probe15 for Professional Plus, galvanic
  • Order
  • Call for Price
  • 605203DO probe16 for Professional Plus, Polarographic
  • Order
  • Call for Price
  • 605101pH probe2 for Professional Plus
  • Order
  • Call for Price
  • 605102ORP probe2 for Professional Plus
  • Order
  • Call for Price
  • 605103pH/ORP probe23 for Professional Plus
  • Order
  • Call for Price
  • 605104Ammonium probe24 for Professional Plus
  • Order
  • Call for Price
  • 605105Chloride probe24 for Professional Plus
  • Order
  • Call for Price
  • 605106Nitrate probe24 for Professional Plus
  • Order
  • Call for Price

YSI Professional Plus Replacement DO Probe Membranes

  • Part Number/Description
  • Cart
  • Price
  • 605913Replacement membranes1 for Professional Plus galvanic probe
    Yellow cap 1.25 Mil Polyethylene
  • Order
  • Call for Price
  • 605912Replacement membranes1 for Professional Plus galvanic probe
    Black cap 1.00 Mil Teflon
  • Order
  • Call for Price
  • 605914Replacement membranes1 for Professional Plus galvanic probe
    Blue cap 2.00 Mil Polyethylene
  • Order
  • Call for Price
  • 605306Replacement membranes1 for Professional Plus polarographic probe
    Yellow cap 1.25 Mil Polyethylene
  • Order
  • Call for Price
  • 059880Replacement membranes1 for Professional Plus polarographic probe
    Black cap 1.00 Mil Teflon
  • Order
  • Call for Price
  • 605307Replacement membranes1 for Professional Plus polarographic probe
    Blue cap 2.00 Mil Polyethylene
  • Order
  • Call for Price

YSI Professional Plus Calibration Solutions

Our entire line of calibration solutions are available in the field supplies section

  • Part Number/Description
  • Cart
  • Price
  • 603824YSI pH solution for Professional Plus
    6 individual 1 pint (~473 mL) bottles, 2 each of pH 4, 7, and 10
  • Order
  • Call for Price
  • 003821YSI pH solution for Professional Plus
    6 individual 1 pint (~473 mL) bottles,pH 4
  • Order
  • Call for Price
  • 003822YSI pH solution for Professional Plus
    6 individual 1 pint (~473 mL) bottles,pH 7
  • Order
  • Call for Price
  • 003823YSI pH solution for Professional Plus
    6 individual 1 pint (~473 mL) bottles,pH 10
  • Order
  • Call for Price
  • COND-1K-500MLEQUIPCO conductivity solution for Professional Plus
    500 mL bottle, 1000 µS
  • Order
  • Call for Price
  • COND-10K-500MLEQUIPCO conductivity solution for Professional Plus
    500 mL bottle, 10,000 µS
  • Order
  • Call for Price
  • 065270YSI conductivity solution for Professional Plus
    1 quart (~946 mL), 1000 µS
  • Order
  • Call for Price
  • 065272YSI conductivity solution for Professional Plus
    1 quart (~946 mL), 10000 µS
  • Order
  • Call for Price
  • 065274YSI conductivity solution for Professional Plus
    1 quart (~946 mL), 100000 µS
  • Order
  • Call for Price
  • 060907YSI conductivity solution for Professional Plus
    8 individual 1 pint (~473 mL) bottles, 1000 µS
  • Order
  • Call for Price
  • 060911YSI conductivity solution for Professional Plus
    8 individual 1 pint (~473 mL) bottles, 10000 µS
  • Order
  • Call for Price
  • 060660YSI conductivity solution for Professional Plus
    8 individual 1 pint (~473 mL) bottles, 50000 µS
  • Order
  • Call for Price
  • ORP-500MLEQUIPCO ORP solution for Professional Plus
    500 mL bottle, Zobell solution
  • Order
  • Call for Price
  • 061320YSI ORP solution for Professional Plus
    125 mL bottle, Zobell solution
  • Order
  • Call for Price
  • 005580YSI confidence solution for Professional Plus
    6 individual 1 pint (~473 mL) bottles
  • Order
  • Call for Price
  • 003841YSI Ammonium solution for Professional Plus
    500 mL bottle, 1 mg/l
  • Order
  • Call for Price
  • 003842YSI Ammonium solution for Professional Plus
    500 mL bottle, 10 mg/l
  • Order
  • Call for Price
  • 003843YSI Ammonium solution for Professional Plus
    500 mL bottle, 100 mg/l
  • Order
  • Call for Price
  • 003885YSI Nitrate solution for Professional Plus
    500 mL bottle, 1 mg/l
  • Order
  • Call for Price
  • 003886YSI Nitrate solution for Professional Plus
    500 mL bottle, 10 mg/l
  • Order
  • Call for Price
  • 003887YSI Nitrate solution for Professional Plus
    500 mL bottle, 100 mg/l
  • Order
  • Call for Price

YSI Professional Plus Accessories

  • Part Number/Description
  • Cart
  • Price
  • 603059Flow cell for Professional plus, 11 or 2 port, standard
  • Order
  • Call for Price
  • 603076Flow cell for Professional plus, 11 or 2 port, extended length
  • Order
  • Call for Price
  • 603077Flow cell for Professional plus with 1 port adapter, 1 or 2 port, standard
  • Order
  • Call for Price
  • 606850Flow cell for Professional plus with Quatro cables
  • Order
  • Call for Price
  • 603078Flow cell 1 port adapter for Professional Plus
  • Order
  • Call for Price
  • 603056Flow cell mounting spike for Professional Plus
  • Order
  • Call for Price
  • 603075Carrying case for Professional Plus, soft sided
  • Order
  • Call for Price
  • 603074Carrying case for Professional Plus, hard sided
  • Order
  • Call for Price
  • 603070Shoulder strap for Professional Plus
  • Order
  • Call for Price
  • 603069Belt clip for Professional Plus
  • Order
  • Call for Price
  • 063517Ultra clamp2 for Professional Plus
  • Order
  • Call for Price
  • 063507Tripod3 for Professional Plus
  • Order
  • Call for Price
  • 626444Lab dock4 for Professional Plus
  • Order
  • Call for Price
  • 605170Electrode stand5 for professional Plus
  • Order
  • Call for Price
  • 625120BOD analyst pro software for Professional Plus
  • Order
  • Call for Price
  • 605978Cable weight for Professional Plus, 4.9 oz
  • Order
  • Call for Price
  • 063019Cable weight for Professional Plus, 3″, 24 oz
  • Order
  • Call for Price
  • 063020Cable weight for Professional Plus, 6″, 51 oz
  • Order
  • Call for Price

Browse All Rental Categories

113 Categories, 304 Models

Our Most Popular Rental Categories

Browse By Manufacturer

34 Manufacturers, 266 Models

Popular Sales Equipment & Promotions

Field Supplies

Great Prices for Project Supplies

Did you know that Equipco also sells environmental field supplies?

Whether you need calibration standards, tubing, or other supplies like gloves and labels, we stock everything you need to finish the job. Our high quality field supplies, including NIST traceable calibration solutions and gases, come at significant savings over manufacturer brands.

Used Equipment

Great Discounts for Used Equipment

Did you know that Equipco also sells used equipment?

Whenever we have used equipment to sell, whether like-new equipment used only for demonstration or a former rental, well maintained and available for a great price, find what you’re looking for here and check back for updates.

RKI Eagle 2

Multiple Gas Monitor

RKI’s Eagle 2 is an advanced portable gas detector capable of monitoring up to six sensors simultaneously including a PID. 16 different sensors are available providing for hundreds of configuration possibilities.

Landtec GEM5000

Landfill Gas Analyzer

The GEM5000 is the latest in the line of Landtec's GEM landfill gas analyzers. Now lighter, smaller, more accurate, and with an improved user interface, the only instrument you need to take into the field just got even better.

Levelogger 5

Water Level Datalogger

Advanced and durable, the Levelogger Edge is the latest water level datalogger from Solinst. An all new sensor design manages to achieve excellent accuracy while being more robust then previous models and remaining economical.

RAE MiniRAE 3000

Handheld PID Monitor

RAE Systems PIDs are known worldwide for their incredible reliability, accuracy, and features. The MiniRAE 3000 is the latest flagship model featuring the widest range of any handheld PID available and built in correction factors for over 200 compounds.

MultiRAE Series

Multiple Threat Monitor

The MultiRAE Series of handheld gas detectors includes three models for detection of up to six threats simultaneously. Choose from 25 toxic sensors, 3 PID sensors with a 9.8 eV lamp option, and even a gamma radiation sensor.

Your Rental Cart is Empty
Browse Rental Inventory



I forgot my password…