YSI Professional Plus Meter - Probe/Cable Assemblies and Accessories

  • $2,723.00

Meter Body, Cables and probes are all ordered separately, or as a Field Kit.

This 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. 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 multi-parameter instrument. Quatro cables include a temperature / conductivity probe.

 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

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

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*

When purchasing the Pro Plus you will receive the instrument, manual, batteries, communications saddle, USB cable, and Data Manager software. 

Inquire for ammonium (ISE), chloride (ISE) and nitrate (ISE) sensors.

Parameter (Units)

Sensor Type





(mmHg, inHg, mbar, psi, kPa, ATM)


375 to 825 mmHg

±1.5 mmHg from 0 to 50°C

0.1 mmHg



(µS, mS)

Four Electrode Cell

0 to 200 mS/cm (auto-range)

1 m, 4 m cables:

±0.5% of reading or 0.001 mS/cm, whichever is greater

20 m cable:

 ±1% of reading or 0.001 mS/cm, whichever is greater 

Range dependent

0 to 0.500 mS/cm: 0.001

0.501 to 50.00 mS/cm: 0.01

50.01 to 200 mS/cm: 0.1



Dissolved Oxygen

temp comp range -5 to 50°C

Polarographic or Galvanic

0 to 500%

0 to 50 mg/L

0 to 200% / 0 to 20 mg/L

± 2% of reading or 2% air saturation / or 0.2 mg/L whichever is greater

200% – 500% / 0 to 20 mg/L

± 6% of reading

0.1% or 1% air saturation (user selectable)

ORP (mV)

Platinum Button

-1999 to +1999 mV

±20 mV in redox standards

0.1 mV

pH (mV, pH units)

Glass Combination Electrode

0 to 14 units

±0.2 units

0.01 units


(ppt, PSU)

Calculated from Conductivity and Temperature

0 to 70 ppt

±1.0% of reading or ±0.1 ppt, whichever is greater

0.01 ppt


Field-rugged cables (°C, °F, K)


-5 to 70°C (23 to 158°F)


±0.3°C cables over 45-meters


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