Environmental Monitoring Equipment & Supplies • Sales, Rental & Service by Enviro-Equipment — Charlotte, North Carolina USA

  • Measures pH, dissolved oxygen (DO), conductivity, resistivity, salinity, total dissolved solids (TDS), temperature, barometric pressure, and oxidation reduction potential (ORP).
  • Includes flow-through cell for low flow sampling measurements.
  • Fits into 2" diameter wells and larger.
  • 4 meter (13 feet) and 30 meter (98 feet) cable lengths available.
Title Daily Rate Weekly Rate Monthly Rate
YSI Pro Plus 13 FT Water Quality Instrument Rental $100.00 $300.00 $900.00

The YSI Professional Plus handheld multiparameter water quality meter provides reliable field measurements for dissolved oxygen, conductivity, resistivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), barometric pressure, pH, and ORP. The Professional Plus is rugged, light weight, and provides all water quality field measurements on one screen! No need to cycle through various screens to take down measurements.

Items Included:
  • YSI ProODO Meter and Probe
  • Flow-Through Cell
  • Calibration Solutions (pH, ORP, Conductivity)
  • Hard Case
  • Probe Guard
  • ProComm II Saddle and Cable
  • Data Manager PC Software
  • Field Calibration Record
  • Spare Batteries
  • Instruction Manual
  • DO Replacement Kit





Dissolved Oxygen (%) (temp comp range -5 to 45°C)

0 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)

Dissolved Oxygen (mg/L) (temp comp range -5 to 45°C)

0 to 50 mg/L

0 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 saturation

Temperature (Field rugged cables)

-5 to 70°C

±0.2°C (±0.3°C cables over 45-meters)



0 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


0 to 70 ppt

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

0.01 ppt


0 to 14 units

±0.2 units

0.01 units


-1999 to +1999 mV

±20 mV in redox standards

0.1 mV

Total Dissolved Solids (TDS)

0 to 100 g/L TDS constant range 0.30 to 1.00 (0.64 default)

0.001, 0.01, 0.1g/L


375 to 825 mmHg

±1.5 mmHg from 0 to 50°C

0.1 mmHg

Auto Stable

User-defined auto-stable function holds stable readings on display when criteria is met


Built-in barometer

Buffer Recognition

Auto buffer recognition for US and NIST buffers


RoHS, CE, WEEE, C-Tick, VCCI, FCC, IP-67, 1-meter drop test, Assembled in USA


USB 2.0; ProComm II communications saddle and USB cable included; user-upgradeable software via USB and website


MS (military spec) waterproof with bayonet lock

Data Management

Data Manager desktop software included; 100 user-defined folders and site names
Minimum PC Requirements:

  • Windows 2000 with SP4 (minimum) or XP with SP2 (minimum)
  • 300 MHz or higher Pentium-compatible CPU
  • 128 MB of RAM or higher
  • 80 MB or more of free hard-disk space
  • USB 2.0
  • Microsoft.NET (installed with Data Manager)

Data Memory

5,000 data sets (data, date, time, user-defined info); 100 GLP files


8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in x 8.5 in x 2.21 in)

DO Membrane Response Times (T95; 100%-0) and Flow Dependence

1.25 mil PE = 8 seconds and 6 in/sec flow
2.0 mil PE = 17 seconds and 3 in/sec flow
1 mil Tefl on® = 18 seconds and 12 in/sec flow

DO Sensors

Polarographic or galvanic field sensors; self-stirring polarographic BOD sensor for the lab

Field Cables

Standard lengths of 1, 4, 10, 20, or 30 meters - up to 100 meters on DO only cables; 4- through 30-meter cables include a cable management kit

Flow Cell

Single, dual and multiparameter Quatro cable all flow cell compatible

GLP Compliance

Yes; detailed GLP information is stored and is available to view, download or print


English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese, Chinese (Simplified & Traditional)

Logging Modes

Single or Continuous

Operating Temperature

-10 to 60°C


2 alkaline C-cells provide 80 continuous hours at ambient temperature without backlight; ProComm II saddle provides USB power or optional wall power, cigarette lighter, and universal cell phone charger options

Storage Temperature

-20 to 70°C

User ID

Optional user ID for data security


IP-67 (even with the battery cover off); floats

Weight with Batteries

475 grams (1.05 lbs)

YSI Professional Plus Manual1.71 MB