Buy or Rent 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, ORP, ammonium (ammonia), nitrate, chloride, and temperature.

SKU: 6050000-1 Categories: ,
  • 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

Product Manual (PDF)
Quickstart Guide (PDF)
Specifications (PDF)

Item DescriptionPurchase Price
YSI Professional Plus (Meter Only)$1,225.50
Quatro 1M Cable Assembly (Requires Sensors)$1,107.22
Quatro 4M Cable Assembly (Requires Sensors)$1,372.75
Quatro 10M Cable Assembly (Requires Sensors)$1,429.75
Quatro 20M Cable Assembly (Requires Sensors)$1,539.00
Quatro 30M Cable Assembly (Requires Sensors)$1,670.10
pH Sensor$170.05
ORP Sensor$199.50
Polarographic DO Probe$179.55
Quatro Flow-thru Cell$375.25

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