Pro20 Dissolved Oxygen Instrument

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Product Features

The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design. Available sensors are EPA approved for wastewater compliance reporting of BOD, CBOD, and DO.

Instrument Only.  Cables, probes/sensors, and accessories sold separately.


Take advantage of the Complete Solution promo going on now through December 31, 2019. Order a Pro20 system (handheld, cable, and sensor) and receive a case, shoulder strap, and membrane kit (any type) for FREE (US only). Use the code Pro20complete to receive your discount. Please see the ordering directions below for more detail!

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.

YSI now offers an Extended Warranty for the Pro20 (new instruments only).

Please visit the Pro20 Kits page for fully assembled systems.

Check out the ProSolo if you're interested in an optical dissolved oxygen instrument.

The Pro20i is also available from YSI. Unlike the Pro20, the Pro20i features an integral (i.e. not user-replaceable) cable.

How to Order a Pro20 Complete Solution Package:

1. Add the following to your cart using the order tabs above:Pro20 meter

  • Pro Series DO cable (any length)
  • Pro Series polarographic or galvanic DO sensor
  • 5908 or 5913 membrane kit
  • Soft-sided case (603075 or 603162)
  • Shoulder strap (603070)

2. Apply the code Pro20complete to your order before checking out.

Please visit our extensive dissolved oxygen resource page to learn about all things DO and BOD related;

You can also download The Dissolved Oxygen Handbook covering all things DO related from technologies, to maintenance and calibrations, and acquiring the best data.

SKU: 6050020


Documentation & Tools

Documentation & Tools