Designed for demanding field work the ProDSS is the latest, smartest, most innovative portable water quality multi- parameter instrument from the YSI stable.

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The YSI ProDSS Water Quality Meter can measure parameters like DO (optical Dissolved Oxygen), pH, ORP, conductivity, specific conductance, salinity, TDS, resistivity, chloride, nitrate, depth, temperature and turbidity. The YSI ProDSS takes the advanced technology from the EXO series to make the best handheld available. This water quality monitoring instrument is rugged and reliable with intelligent, user-replaceable digital sensors that can be connected to any port and that are automatically recognised by the instrument and retain the calibration data. With optional GPS and depth the YSI ProDSS is completely customisable and with military specification connectors, IP67 waterproof, rubber over-moulded case and 1-metre drop tests, durability is ensured for longevity of sampling even in the harshest field conditions.

  • Smart, cost-effective and adaptable for the future.
  • High-impact body is built to record water quality parameters to depths of 250 meters.
  • Data is stored on-board the instrument for downloading to a laptop on completion of the monitoring sequence
  • YSI pedigree
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YSI ProDSS Equipment Options:

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YSI ProDSS Specifications
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.)
Weight with batteries
567 grams (1.25 lbs)
Rechargeable lithium-ion battery pack providing ~48 hours of battery life (instrument only with backlight off)
Instrument operating temperature
0 to 50 °C (32 to 122 °F)
Instrument storage temperature
0 to 45 °C (32 to 113 °F) with battery installed; 0 to 60 °C (32 to 140 °F) without battery installed
Colour, LCD graphic display
USB port
Built-in micro USB On-The-Go port for PC connection, recharging/powering the ProDSS & connecting directly to a USB stick
Available with or without depth sensor in 1, 4, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100-meters
Sensor ports
4 universal sensor ports on each cable; can accept any ProDSS sensor
3-year instrument; 2-year bulkhead, cable assembly, and sensors; 1-year pH and pH/ORP sensor modules, ODO sensor caps & Li-ion battery pack; 6-months ammonium, nitrate & chloride sensor modules
> 100000 data sets
Logging modes
Single point or continuous with auto-stable feature
GLP compliance
Yes; 400 detailed GLP records can be stored & are available to view, download & print.
English, Spanish, Portuguese, French, German, Italian, Japanese, Norwegian, Simplified Chinese, Traditional Chinese
CE; RoHS; IP-67; WEEE; FCC; UN Part III, Section 38.3, Test methods for lithium-ion batteries (Class 9)
Optional internal GPS; coordinates are stored with measurement data & site lists
Sites & Data ID
100 user-defined sites and 100 user-defined data ID tags
Instrument, Sensor & Cable
-5 to 70 °C (temperature compensation range)
for DO mg/L measurement: -5 to 50 °C ) ±0.2 °C
0.1 °C or 0.1 °F (user selectable)
°C, °F, K
0 to 14 pH units
±0.2 pH units
0.01 pH units
pH, pH mV
-1999 to 1999 mV
±20 mV
0.1 mV
Dissolved Oxygen
0 to 500%, 0 to 50 mg/L
0 to 200%: ±1% of reading or 1% saturation, whichever is greater
200 to 500%: ±8% of reading
0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater
20 to 50 mg/L: ±8% of reading
0.01 mg/L and 0.1%, or 0.1 mg/L and 1% (user selectable)
% saturation, % saturationlocal, mg/L, ppm
375 to 825 mmHg
±1.5 mmHg from 0 to 50 °C
0.1 mmHg
mmHg, inHg, bar, psi, kPa, atm
0 to 200 mS/cm
0 – 100 mS/cm: ±0.5% of reading or .001 mS/cm, whichever is greater 100 – 200 mS/cm: ±1.0% of reading
0.001, 0.01 or 0.1 μS/cm (range dependent)
μS/cm, mS/cm
Specific Conductance*
0 to 200 mS/cm
0 – 100 mS/cm: ±0.5% of reading or .001 mS/cm, whichever is greater 100 – 200 mS/cm: ±1.0% of reading. User selectable reference temp. (15 to 25 °C; default 25°C) & compensation coefficient (0 to 4%/°C; default 1.91%)
0.001, 0.01, 0.1 mS/cm
μS/cm or mS/cm
0 to 70 ppt
±1.0% of reading or ±0.1 ppt, whichever is greater
0.01 ppt
ppt or PSU
Total Dissolved Solids*
0 to 100 g/L
Calculated from specific conductance and a user-selectable TDS multiplier (0.30 to 1.00; default 0.65)
0.001, 0.01, 0.1 g/L
mg/L, g/L, kg/L
Seawater Density*
0.0 to 50.0 sigma, sigma T
0.1 sigma or sigma T
Sigma, Sigma T
0 to 4000 FNU
0 to 999 FNU: 0.3 FNU or ±2% of reading, whichever is greater
1000 to 4000 FNU: ±5% of reading
Total Suspended Solids*
0 to 30000 mg/L
User correlated from turbidity field measurements & lab TSS measurements from grab samples
0.01, 0.1 mg/L
0 to 200 mg/L NH4 -N
±10% of reading or 2 mg/L, whichever is greater
0.01 mg/L
NH4 -N mg/L, NH4 -N mV
0 to 18000 mg/L Cl
±15% of reading or 5 mg/L, whichever is greater
0.01 mg/L
Cl mg/L, Cl mV
0 to 200 mg/L NO3
-N ±10% of reading or 2 mg/L, whichever is greater
0.01 mg/L
NO3 -N mg/L, NO3 -N mV
0 to 328 feet (0 to 100 m)
±0.013 ft (±0.004 m) for 1, 4 & 10 m cables
±0.13 ft (±0.04 m) for cables 20 m & longer 0.001 m or 0.01 ft
Instrument, Sensor & Cable
Sensor Type/
Measurement Method
Max Depth
Thermistor, installed on conductivity sensor
Not available
2 years for conductivity/temperature sensor
Combination glass bulb electrode, Ag/AgCl reference electrode with gelled electrolyte
1, 2, or 3 point
100 m
2 years for pH & pH/ORP sensors
1 year for pH & pH/ORP sensor modules
Platinum button with Ag/AgCl reference
1 point
100 m
2 years for pH/ORP sensor
1 year for pH/ORP sensor module
Dissolved Oxygen
Optical luminescence – lifetime method
1 or 2 point
100 m
2 years for optical DO sensor
1 year for optical DO sensor cap
1 point
3 years, integrated into ProDSS handheld
Four nickel electrode cell
1 point
100 m
2 years for conductivity/temperature sensor
Specific Conductance*
Calculated from conductivity & temperature
1 point
Calculated from conductivity & temperature
1 point
Total Dissolved Solids (TDS)*
Calculated from specific conductance & a user selectable TDS multiplier (0.30 to 1.00; default 0.65)
Calculated from conductivity & temperature
Seawater Density*
Sigma is calculated from salinity, temperature & pressure (depth)
Sigma T is calculated from salinity & temperature
Nephelometric – Optical, 90° scatter
1, 2, or 3 point
2 years for turbidity sensor
Total Suspended Solids(TSS)*
User correlated from turbidity field measurements & lab TSS measurements from grab samples
Ion selective electrode
1, 2, or 3 point
20 m
2 years for ammonium sensor
6 months for ammonium sensor module
Calculated from ammonium, temperature, salinity & pH
Ion selective electrode
1, 2, or 3 point
20 m
2 years for chloride sensor
6 months for chloride sensor module
Ion selective electrode
1, 2, or 3 point
20 m
2 years for nitrate sensor
6 months for nitrate sensor module
Pressure transducer
1 point
2 years, integrated into cable assembly
To view the Instrument, Sensor & Cable data please visit this page on a computer


The YSI ProDSS is configured for you and the cables and probes/sensors can be selected according to your requirements. All rental instruments will be configured/calibrated to measure temperature/conductivity, DO, pH, ORP and turbidity.

3/8 inch and 1/4 inch fittings
Lubricant and instructions
Calibration and Storage Cup
Replacement assembly includes: calibration cup, sleeve, and seal
ProDSS ODO Optical Dissolved Oxygen Sensor: Titanium user-replaceable digital smart sensor
ProDSS Turbidity Sensor
ProDSS Conductivity and Temperature Sensor
ProDSS pH Sensor with Module
ProDSS pH/ORP Sensor with Module
ProDSS Nitrate Sensor with Module
ProDSS Ammonium Sensor with Module
ProDSS Chloride Sensor with Module
Calibration Solutions
Conductivity Calibrator Solution
pH Buffer
Zobell Solution, ORP Calibrator
Turbidity Standard
Ammonium Standard
Nitrate Standard
Ammonium Calibration Solution
5580 Confidence Solution (case of 6 pints)


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