YSI Pro20 Dissolved Oxygen Instrument


YSI Pro20 Dissolved Oxygen Instrument

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:

  • Internal barometer for highest accuracy
  • Choose field DO sensors (Polarographic or Galvanic) or lab BOD probe for BOD in wastewater
  • One Touch Cal calibrates within 3 seconds with the push of a button
  • Stores 50 data sets
  • Graphic, backlit display and glow in the dark keypad
  • Available with 1, 4, 10, 20, 30 or 100-meter cables
  • View display with polarized sunglasses on
  • Fastest response time on the market with 95% response in 8 seconds with standard membrane
  • Multiple languages include English, Spanish, French and German
  • User replaceable sensors and cables 
  • 3-year instrument; 2-year cable warranty

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.


Certifications IP-67, RoHS, Assembled in USA, CE, 1-meter drop test, WEEE
Connector MS (military spec) waterproof with bayonet lock
Digital / Digital Sensors Analog
Equipment used with ProSeries 20-x cables, ProBOD
Graphic Display backlit display AND keypad, Graphic display with detailed Help
Languages English, Spanish, French, German
Logging Capabilities Single
Measurement Range

0 to 500%; 0 to 50 mg/L

Memory 50 data sets
Multiparameter Yes
Parameters Measured Temperature, Dissolved Oxygen, Built-in barameter
Power 2 alkaline C-cells provide 450 continuous hours at ambient temperature without backlight
Sampling Yes
Unit of Measure air saturation, mg/L, Barameter-mmHg, °F, Temperature- °C, Dissolved Oxygen-%
User Calibratable Yes
User Replaceable Yes
Warranty 3-year instrument; 2-year field cables
Waterproof floats, IP-67 (even with the battery cover off)

Ordering Information:-

Step 1: Order Instrument

SKU Description
6050020 Pro20 Handheld instrument

Step 2: Order Cable(s)

SKU Description
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

Step 3: Order Sensor(s) and Probe(s)

SKU Description
605780 Self-stirring BOD probe with 2-m (6 ft.) cable included
605202 Galvanic Sensor for any cable
605203 Polarographic Sensor for any cable

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