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Multiparameter Instrument


Price starts at $1,920.00

Product Code : 556-01

Manufacturer : YSI

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Probe & cable Assembly, ph kit and ph/ORP kit are sold separately Featuring a waterproof IP-67, impact-resistant case, the YSI 556MPS simultaneously measures dissolved oxygen, pH, conductivity, temperature, and ORP. Or, simply purchase the cable to measure DO, conductivity, and temperature if needed. The YSI 556 MPS conforms to GLP standards.

You may also want to review the Professional Plus Multiparameter Handheld "ProPlus"

Packed with Features!

Battery Options: The unit is powered by alkaline batteries or an optional rechargeable battery pack (YSI Part # 6118) with fast charge feature.

Optional Barometer:
Internal barometer can be user-calibrated and displayed along with other data, used in dissolved oxygen calibrations, and logged to memory for tracking changes in barometric pressure.

Carrying Case: The instrument comes standard with a soft-sided carrying case with enough space for the YSI 556 MPS, a 20-meter cable, and calibrating supplies.

Additional Features

  • Field-replaceable DO, pH, and pH/ORP probes
  • RS-232 and Compatible with EcowatchTM for WindowsTM data analysis software
  • Easy-to-use, screw-on cap DO membranes
  • User-upgradable software from YSI website
  • Three-year warranty


Pair the 556 up with the 5083 flow cell and 5080 carrying case and you have a complete groundwater package. The 5083 flow cell is extrmely simple to connect to the 556 and cleans up even easier!

In order to ensure data quality be sure to use the 5580 Confidence Solution with the 556 . Quickly check pH, ORP, and conductivity values to guarantee probe accuracy during important field studies.

The 556 also features menu-driven operation with multiple languages including Spanish, French, Italian, German, Norwegian, and English.

Data management is simple with EcoWatch™ desktop software for tabluar and graphical data representations

YSI 556 Instrument General Specifications

Barometer Optional
Cables 4, 10, or 20 meters (13.1, 32.8, 65.6 ft)
Communications RS-232 Serial
Connector MS (military spec) waterproof with bayonet lock
Data Management Data Manager desktop software included; 100 user-defined folders and site names
Data Memory 2,000 data sets (data, date, time, user-defined info); 100 GLP files
Dimensions 11.9 cm width x 22.9 cm length (4.7 in x 9 in)
Logging 49,000 data sets, date and time stamp, manual or logging, with user-selectable intervals
Power 4 alkaline C-cells; optional rechargeable pack
3-year instrument; 1-year probes and cables
Weight with Batteries
916 grams (2.1 lbs)


YSI 556 System Specifications (Instrument with Cable & Probe)

Sensor Type Range Accuracy Resolution
Dissolved Oxygen (%)
0 to 500% air saturation 0 to 200% air saturation, ± 2% of the reading or ± 2% air saturation, whichever is greater; 200 to 500% air saturation, ± 6% of the reading 0.1% air saturation
Dissolved Oxygen (mg/L)
Polarographic 0 to 50 mg/L 0 to 20 mg/L, ± 0.2 mg/L or ± 2% of reading, whichever is greater; 20 to 50 mg/L, ± 6% of the reading 0.01 mg/L
Thermistor -5 to 45°C ±0.15°C 0.1°C
Conductivity Four electrode cell
0 to 200 mS/cm
(auto range)
±0.5% of reading or 0.001 mS/cm, whichever is greater (4-m cable) ±1% of reading or 0.001 mS/cm, whichever is greater (20-m cable) 0.001 mS/cm to 0.1 mS/cm (range dependent)
Salinity Calculated from conductivity and temperature 0 to 70 ppt ±1.0% of reading or 0.1 ppt, whichever is greater 0.01 ppt
pH (optional)
Glass Combination Electrode 0 to 14 units ±0.2 units 0.01 units
ORP (optional) Platinum button -1999 to +1999 mV ±20 mV 0.1 mV
Total Dissolved Solids (TDS) Calculated from conductivity and temperature 0 too 100 g/L
4 digits
Barometer (optional)

500 to 800 mmHg ±3 mmHg within ±10°C temperature range from calibration point
0.1 mmHg


Ordering Guide

Item #
Instrument with 5061 large, soft-sided carrying case
556-02 Instrument with barometer option and 5061 large, soft-sided carrying case
5563-4 4-meter cable with DO, temperature, conductivity
5563-10 10-meter cable with DO, temperature, conductivity
5563-20 20-meter cable with DO, temperature, conductivity
pH probe for any 5563 cable
5565 pH/ORP probe for any 5563 cable
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