
Pro20
Lab / Field Dissolved Oxygen
The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design.

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Have a question about your YSI Pro20? Check out the support page with resources compiled just for you.
Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI Pro20.
The YSI Pro20 dissolved oxygen meter is a rugged, user-friendly instrument for dissolved oxygen measurement. The Pro20 can be used in the lab or the field and can go from one to the other in seconds.
User-replaceable sensors and cables and convenient One Touch Cal feature makes it extremely user friendly. Mil-spec (military spec) connectors, IP-67 waterproof and rubber over molded case, and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling even in the harshest field conditions. The feature set of the Pro20 results in a low total cost of ownership over the life of the product.
Fast response times with the Polarographic or Galvanic dissolved oxygen sensors allow you to complete your sampling routine quickly. The long life of the Polarographic sensor saves time and money and reduces your overall cost. The Galvanic sensor enables you to start sampling immediately without a warm-up period. Either sensor you choose for the field will give you accurate, quality data.
Additional features include:
Lab or field - the Pro20 is ready for whatever you need when it comes to oxygen meters.
When ordering the YSI Pro20 you must order the instrument, cable, and dissolved oxygen probe separately, allowing you to choose the system that best fits your application.
If you're interested in learning more about optical dissolved oxygen technology and the YSI ProODO optical DO instrument please visit the ProODO page.
Please visit our extensive dissolved oxygen resource page to learn about all things DO and BOD related; www.YSI.com/weknowDO
Pro20 Instrument General Specifications
| Barometer | Built-in barometer |
| Cable Lengths* | 1- 4- 10- 20- 30- and 100-m lengths (special order up to 100-m) (3.28, 13.1, 32.8, 65.6, 98 ft.) |
| Certifications | RoHS, CE, WEEE, IP-67, 1-meter drop test |
| Connector | MS (military spec) waterproof with bayonet lock |
| Data Memory | 50 data sets |
| Dimensions | 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) |
| Languages | English, Spanish, German, French |
| Power | 2 alkaline C-cells providing 450 hours of battery life; low battery indicator |
| Salinity Input Range |
0-70 ppt; manual (automatically compensates for manual input value) |
| Warranty |
3-year instrument; 2-year cable; 1-year Polarographic sensors; 6-months Galvanic sensors |
| Waterproof |
IP-67 (even with the battery cover off) |
| Weight with Batteries |
475 grams (1.05 lbs) |
| * Special order cable lengths up to 100-meters in 10-meter increments available. |
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Pro20 System Specifications (Instrument with Cable & Probe)
| Sensor Type | Range | Accuracy | Resolution | |
| Dissolved Oxygen (%) |
Polarographic or Galvanic | 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% or 1% air saturation (user selectable) |
| Dissolved Oxygen (mg/L) |
Polarographic or Galvanic | 0 to 50 mg/L | 0 to 20 mg/L, ± 2% of the reading or ±0.2 mg/L, whichever is greater; 20 to 50 mg/L, ± 6% of the reading | 0.01 or 0.1 mg/L (user selectable) |
| Temperature |
-5 to 55°C (0 to 45°C; DO compensation range for mg/L ) |
±0.3°C | 0.1°C | |
| Barometer | 400 to 999.9 mmHg | ± 5 mm Hg within ± 5°C temperature range from calibration point | 0.1 mm Hg |
Ordering Guide
| Item # |
Description |
| 6050020 | Pro20 Handheld instrument |
| 60520-1 | 1-m cable for DO/temp |
| 60520-4 |
4-m cable for DO/temp (includes cable management kit) |
| 60520-10 | 10-m cable for DO/temp (includes cable management kit) |
| 60520-20 | 20-m cable for DO/temp (includes cable management kit) |
| 60520-30 |
30-m cable for DO/temp (includes cable management kit) |
| 60520-100 | 100-m cable for DO/temp |
| 605780 | Self-stirring BOD probe with 2-m (6 ft.) cable included |
| 605202 | Galvanic Sensor for any cable |
| 605203 | Polarographic Sensor for any cable |
Français - YSI Pro20 User Manual - Rev B
Deutsch - YSI Pro20 User Manual - Rev B
Español - YSI Pro20 User Manual - Rev B
5905, 5010, 200-BOD, and Pro-BOD Probe Instruction Manual
YSI Pro20 Dissolved Oxygen Meter Specification Sheet
Groundwater Applications & Capabilities
Water Quality Sampling for Field and Laboratory
Wastewater - Water quality capabilities & Solutions
Aquaculture Applications, Capabilities & Solutions
Español - Piscicultura Aplicaciones, Competencia y Soluciones
Dissolved Oxygen Management and Related Costs in Pond Aquaculture
Español - Gestión del Oxígeno Disuelto y costes relacionados en estanques de piscicultura
How to Ensure Accurate and Successful BOD Measurements
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3056 Flow Cell Mounting SpikeThe mounting spike simply attaches to the base of the 3059 or 3077 flow cell to stabilize the flow cell on the ground. |
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3059 Flow Cell, Standard 203 mLStandard flow cell. 203 mL. Easily disassembles for complete cleaning. Can be used with the Pro Series single or dual-parameter cables, 556, or 600XL and 600XLM instruments. |
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3062 Cable Management KitEasily manage your cables. Also attaches to the back of the instrument to create a very compact system. |
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3069 Belt ClipEasily attach any Pro Series, 556, or 650 instrument to your belt or other convenient location with this simple clip. |
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3074 Hard-Sided Carrying CaseThe 3074 hard-sided carrying case ideal for all Pro Series products. |
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3075 Soft-Sided Carrying CaseA soft-sided carrying case ideal for all Pro Series products. Cable management kits easily attach to the outside of the case keeping the inside clean and dry. |
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4654 TripodThis small 4654 tripod supports the instrument at a convenient viewing angle. |
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5202 Pro Series Galvanic DO SensorYSI 5202 Galvanic sensor for the Professional Plus and Pro20 DO instruments. |
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5203 Pro Series Polarographic DO SensorYSI 5203 Polarographic sensor for the Professional Plus and Pro20 DO instruments. |
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5906 DO Cap Membrane KitYSI 5906 screw-on cap dissolved oxygen membranes. |
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5908 DO Cap Membrane KitYSI 5908 screw-on cap dissolved oxygen membranes. |
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5978 Cable WeightThe 5978 cable weight attaches to the end of the probe guard. Ideal for longer cables to ensure you reach the depths you need. |
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603070 Pro Series Shoulder StrapEasily attach any Pro Series instrument to the shoulder strap to keep your instrument secure and safe when sampling. |
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60520 Pro Series DO CableThe 60520 is a 1-port cable for use with the Professional Plus or Pro20 instrument. The port requires a DO probe. |
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614 Ultra ClampThis small clamp supports the instrument at a convenient viewing angle. Ideal for attaching the instrument to the gunwale of a boat, table, or and surface with an edge to clamp to. |
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ProBOD Self-Stirring BOD ProbeThe ProBOD self-stirring BOD probes are designed to fit into standard 300 mL BOD bottles with various funnels available for use with other tapers. |
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