YSI Pro Plus Quatro Water Quality Meter

The YSI Professional Plus handheld 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, temperature and ORP. Ammonium (ammonia), nitrate and chloride may be available. Call your local Eco-Rental Solutions office for more information.

Additional Information

  • 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
  • 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*
  • Surface water
  • Wastewater
  • Aquaculture
  • Groundwater

Professional Plus System Specifications (Cables & Sensors)

Sensor TypeRangeAccuracyResolutionUnitsCalibration
Dissolved Oxygen (%)
(temp comp range -5 to 45°C)
Polarographic or Galvanic0 to 500%0 to 200%
(± 2% of reading or 2% air saturation, whichever is greater)
200% – 500% (± 6% of reading)
1% or 0.1% air saturation
(user selectable)
%1 or 2-points with zero
Dissolved Oxygen (mg/L)
(temp comp range -5 to 45°C)
Polarographic or Galvanic0 to 50 mg/L0 to 20 mg/L
(± 2% of reading or 0.2 mg/L, whichever is greater)
20 – 50 mg/L (± 6% of reading)
0.1 or 0.01 mg/L (user selectable); 0.1% air saturationmg/L, ppm1 or 2-points with zero
(Field rugged cables)
-5 to 70°C±0.2°C (±0.3°C cables over 45-meters)0.1°C°C, °F, K
0 to 40°C±0.35°C0.1°C°C, °F, K
Conductivity**Four electrode cell0 to 200 mS/cm
(auto range)
±0.5% of reading or 0.001 mS/cm, whichever is greater (1-, 4-m cable) ±1% of reading or 0.001 mS/cm, whichever is greater (20-m cable)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
(range dependent)
µS, mS1 point
SalinityCalculated from conductivity and temperature0 to 70 ppt±1.0% of reading or 0.1 ppt, whichever is greater0.01 pptppt, PSU1 point
pHGlass Combination Electrode0 to 14 units±0.2 units0.01 unitsmV, pH units1, 2, 3, 4, 5, or 6 point (user selectable); US, NIST or Custom Buffers
ORPPlatinum button–1999 to +1999 mV±20 mV in redox standards0.1 mVmV1 point
Total Dissolved Solids (TDS)Calculated from conductivity and temperature0 to 100 g/L TDS constant range 0.30 to 1.00 (0.64 default)0.001, 0.01, 0.1g/Lkg/L, g/L
BarometerPiezoresistive375 to 825 mmHg±1.5 mmHg from 0 to 50°C0.1 mmHgmmHg, inHg, mbar, psi, kPa, ATM1 point

Item DescriptionPurchase Price
ProQuatro Meter (Meter Only)$1,329.05
Quatro 1M Cable Assembly (Requires Sensors)$1,741.83
Quatro 4M Cable Assembly (Requires Sensors)$1,784.81
Quatro 10M Cable Assembly (Requires Sensors)$1,858.20
Quatro 20M Cable Assembly (Requires Sensors)$2,005.93
Quatro 30M Cable Assembly (Requires Sensors)$2,172.41
pH Sensor$202.59
ORP Sensor$242.25
Polarographic DO Probe$217.55
Quatro Flow-thru Cell$469.78


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